#include <config.h>
#define _BSD_SOURCE /* for mkdtemp, usleep */
+#define _GNU_SOURCE /* for vasprintf, GNU strerror_r, strchrnul */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "guestfs.h"
+#include "guestfs_protocol.h"
+
+#ifdef HAVE_GETTEXT
+#include "gettext.h"
+#define _(str) dgettext(PACKAGE, (str))
+#define N_(str) dgettext(PACKAGE, (str))
+#else
+#define _(str) str
+#define N_(str) str
+#endif
+
+#define error guestfs_error
+#define perrorf guestfs_perrorf
+#define safe_malloc guestfs_safe_malloc
+#define safe_realloc guestfs_safe_realloc
+#define safe_strdup guestfs_safe_strdup
+#define safe_memdup guestfs_safe_memdup
+
+static void default_error_cb (guestfs_h *g, void *data, const char *msg);
+static void stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+static void sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+static void sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+
+static void close_handles (void);
+
+static int select_add_handle (guestfs_main_loop *ml, guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
+static int select_remove_handle (guestfs_main_loop *ml, guestfs_h *g, int watch);
+static int select_add_timeout (guestfs_main_loop *ml, guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
+static int select_remove_timeout (guestfs_main_loop *ml, guestfs_h *g, int timer);
+static int select_main_loop_run (guestfs_main_loop *ml, guestfs_h *g);
+static int select_main_loop_quit (guestfs_main_loop *ml, guestfs_h *g);
+
+/* Default select-based main loop. */
+struct select_handle_cb_data {
+ guestfs_handle_event_cb cb;
+ guestfs_h *g;
+ void *data;
+};
+
+struct select_main_loop {
+ /* NB. These fields must be the same as in struct guestfs_main_loop: */
+ guestfs_add_handle_cb add_handle;
+ guestfs_remove_handle_cb remove_handle;
+ guestfs_add_timeout_cb add_timeout;
+ guestfs_remove_timeout_cb remove_timeout;
+ guestfs_main_loop_run_cb main_loop_run;
+ guestfs_main_loop_quit_cb main_loop_quit;
+
+ /* Additional private data: */
+ int is_running;
+
+ fd_set rset;
+ fd_set wset;
+ fd_set xset;
+
+ int max_fd;
+ int nr_fds;
+ struct select_handle_cb_data *handle_cb_data;
+};
+
+/* Default main loop. */
+static struct select_main_loop default_main_loop = {
+ .add_handle = select_add_handle,
+ .remove_handle = select_remove_handle,
+ .add_timeout = select_add_timeout,
+ .remove_timeout = select_remove_timeout,
+ .main_loop_run = select_main_loop_run,
+ .main_loop_quit = select_main_loop_quit,
+
+ /* XXX hopefully .rset, .wset, .xset are initialized to the empty
+ * set by the normal action of everything being initialized to zero.
+ */
+ .is_running = 0,
+ .max_fd = -1,
+ .nr_fds = 0,
+ .handle_cb_data = NULL,
+};
+
+#define UNIX_PATH_MAX 108
-static int error (guestfs_h *g, const char *fs, ...);
-static int perrorf (guestfs_h *g, const char *fs, ...);
-static void *safe_malloc (guestfs_h *g, int nbytes);
-static void *safe_realloc (guestfs_h *g, void *ptr, int nbytes);
-static char *safe_strdup (guestfs_h *g, const char *str);
+/* Also in guestfsd.c */
+#define VMCHANNEL_PORT 6666
+#define VMCHANNEL_ADDR "10.0.2.4"
/* GuestFS handle and connection. */
+enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
+
struct guestfs_h
{
- /* All these socks/pids are -1 if not connected. */
+ struct guestfs_h *next; /* Linked list of open handles. */
+
+ /* State: see the state machine diagram in the man page guestfs(3). */
+ enum state state;
+
+ int fd[2]; /* Stdin/stdout of qemu. */
int sock; /* Daemon communications socket. */
- int pid; /* Qemu PID. */
+ pid_t pid; /* Qemu PID. */
+ pid_t recoverypid; /* Recovery process PID. */
+ time_t start_t; /* The time when we started qemu. */
- char *tmpdir; /* Temporary directory containing logfile
- * and socket. Cleaned up unless there is
- * an error.
- */
+ int stdout_watch; /* Watches qemu stdout for log messages. */
+ int sock_watch; /* Watches daemon comm socket. */
+
+ char *tmpdir; /* Temporary directory containing socket. */
char **cmdline; /* Qemu command line. */
int cmdline_size;
- guestfs_abort_fn abort_fn;
- int exit_on_error;
int verbose;
+ int autosync;
+
+ char *path; /* Path to kernel, initrd. */
+ char *qemu; /* Qemu binary. */
+ char *append; /* Append to kernel command line. */
+
+ char *last_error;
+
+ /* Callbacks. */
+ guestfs_abort_cb abort_cb;
+ guestfs_error_handler_cb error_cb;
+ void * error_cb_data;
+ guestfs_send_cb send_cb;
+ void * send_cb_data;
+ guestfs_reply_cb reply_cb;
+ void * reply_cb_data;
+ guestfs_log_message_cb log_message_cb;
+ void * log_message_cb_data;
+ guestfs_subprocess_quit_cb subprocess_quit_cb;
+ void * subprocess_quit_cb_data;
+ guestfs_launch_done_cb launch_done_cb;
+ void * launch_done_cb_data;
+
+ /* Main loop used by this handle. */
+ guestfs_main_loop *main_loop;
+
+ /* Messages sent and received from the daemon. */
+ char *msg_in;
+ int msg_in_size, msg_in_allocated;
+ char *msg_out;
+ int msg_out_size, msg_out_pos;
+
+ int msg_next_serial;
};
+static guestfs_h *handles = NULL;
+static int atexit_handler_set = 0;
+
guestfs_h *
guestfs_create (void)
{
guestfs_h *g;
+ const char *str;
g = malloc (sizeof (*g));
if (!g) return NULL;
+ memset (g, 0, sizeof (*g));
+
+ g->state = CONFIG;
+
+ g->fd[0] = -1;
+ g->fd[1] = -1;
g->sock = -1;
- g->pid = -1;
+ g->stdout_watch = -1;
+ g->sock_watch = -1;
+
+ g->abort_cb = abort;
+ g->error_cb = default_error_cb;
+ g->error_cb_data = NULL;
+
+ str = getenv ("LIBGUESTFS_DEBUG");
+ g->verbose = str != NULL && strcmp (str, "1") == 0;
+
+ str = getenv ("LIBGUESTFS_PATH");
+ g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
+ if (!g->path) goto error;
+
+ str = getenv ("LIBGUESTFS_QEMU");
+ g->qemu = str != NULL ? strdup (str) : strdup (QEMU);
+ if (!g->qemu) goto error;
- g->tmpdir = NULL;
+ str = getenv ("LIBGUESTFS_APPEND");
+ if (str) {
+ g->append = strdup (str);
+ if (!g->append) goto error;
+ }
+
+ g->main_loop = guestfs_get_default_main_loop ();
+
+ /* Start with large serial numbers so they are easy to spot
+ * inside the protocol.
+ */
+ g->msg_next_serial = 0x00123400;
- g->abort_fn = abort; /* Have to set these before safe_malloc. */
- g->exit_on_error = 0;
- g->verbose = getenv ("LIBGUESTFS_VERBOSE") != NULL;
+ /* Link the handles onto a global list. This is the one area
+ * where the library needs to be made thread-safe. (XXX)
+ */
+ /* acquire mutex (XXX) */
+ g->next = handles;
+ handles = g;
+ if (!atexit_handler_set) {
+ atexit (close_handles);
+ atexit_handler_set = 1;
+ }
+ /* release mutex (XXX) */
- g->cmdline = safe_malloc (g, sizeof (char *) * 1);
- g->cmdline_size = 1;
- g->cmdline[0] = NULL; /* This is chosen by guestfs_launch. */
+ if (g->verbose)
+ fprintf (stderr, "new guestfs handle %p\n", g);
return g;
+
+ error:
+ free (g->path);
+ free (g->qemu);
+ free (g->append);
+ free (g);
+ return NULL;
}
void
-guestfs_free (guestfs_h *g)
+guestfs_close (guestfs_h *g)
{
int i;
char filename[256];
+ guestfs_h *gg;
- if (g->pid) guestfs_kill_subprocess (g);
+ if (g->state == NO_HANDLE) {
+ /* Not safe to call 'error' here, so ... */
+ fprintf (stderr, _("guestfs_close: called twice on the same handle\n"));
+ return;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
+
+ /* Try to sync if autosync flag is set. */
+ if (g->autosync && g->state == READY) {
+ guestfs_umount_all (g);
+ guestfs_sync (g);
+ }
- /* The assumption is that programs calling this have successfully
- * used qemu, so delete the logfile and socket directory.
+ /* Remove any handlers that might be called back before we kill the
+ * subprocess.
*/
+ g->log_message_cb = NULL;
+
+ if (g->state != CONFIG)
+ guestfs_kill_subprocess (g);
+
if (g->tmpdir) {
snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
unlink (filename);
- snprintf (filename, sizeof filename, "%s/qemu.log", g->tmpdir);
- unlink (filename);
-
rmdir (g->tmpdir);
free (g->tmpdir);
}
- for (i = 0; i < g->cmdline_size; ++i)
- free (g->cmdline[i]);
- free (g->cmdline);
+ if (g->cmdline) {
+ for (i = 0; i < g->cmdline_size; ++i)
+ free (g->cmdline[i]);
+ free (g->cmdline);
+ }
+
+ /* Mark the handle as dead before freeing it. */
+ g->state = NO_HANDLE;
+ /* acquire mutex (XXX) */
+ if (handles == g)
+ handles = g->next;
+ else {
+ for (gg = handles; gg->next != g; gg = gg->next)
+ ;
+ gg->next = g->next;
+ }
+ /* release mutex (XXX) */
+
+ free (g->msg_in);
+ free (g->msg_out);
+ free (g->last_error);
+ free (g->path);
+ free (g->qemu);
+ free (g->append);
free (g);
}
-/* Cleanup fds and sockets, assuming the subprocess is dead already. */
+/* Close all open handles (called from atexit(3)). */
static void
-cleanup_fds (guestfs_h *g)
+close_handles (void)
{
- if (g->sock >= 0) close (g->sock);
- g->sock = -1;
+ while (handles) guestfs_close (handles);
+}
+
+const char *
+guestfs_last_error (guestfs_h *g)
+{
+ return g->last_error;
}
-/* Wait for subprocess to exit. */
static void
-wait_subprocess (guestfs_h *g)
+set_last_error (guestfs_h *g, const char *msg)
{
- if (g->pid >= 0) waitpid (g->pid, NULL, 0);
- g->pid = -1;
+ free (g->last_error);
+ g->last_error = strdup (msg);
}
-static int
-error (guestfs_h *g, const char *fs, ...)
+static void
+default_error_cb (guestfs_h *g, void *data, const char *msg)
+{
+ fprintf (stderr, _("libguestfs: error: %s\n"), msg);
+}
+
+void
+guestfs_error (guestfs_h *g, const char *fs, ...)
{
va_list args;
+ char *msg;
- fprintf (stderr, "libguestfs: ");
va_start (args, fs);
- vfprintf (stderr, fs, args);
+ vasprintf (&msg, fs, args);
va_end (args);
- fputc ('\n', stderr);
- if (g->exit_on_error) exit (1);
- return -1;
+ if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
+ set_last_error (g, msg);
+
+ free (msg);
}
-static int
-perrorf (guestfs_h *g, const char *fs, ...)
+void
+guestfs_perrorf (guestfs_h *g, const char *fs, ...)
{
va_list args;
- char buf[256];
+ char *msg;
int err = errno;
- fprintf (stderr, "libguestfs: ");
va_start (args, fs);
- vfprintf (stderr, fs, args);
+ vasprintf (&msg, fs, args);
va_end (args);
+
+#ifndef _GNU_SOURCE
+ char buf[256];
strerror_r (err, buf, sizeof buf);
- fprintf (stderr, ": %s\n", buf);
+#else
+ char _buf[256];
+ char *buf;
+ buf = strerror_r (err, _buf, sizeof _buf);
+#endif
- if (g->exit_on_error) exit (1);
- return -1;
+ msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
+ strcat (msg, ": ");
+ strcat (msg, buf);
+
+ if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
+ set_last_error (g, msg);
+
+ free (msg);
}
-static void *
-safe_malloc (guestfs_h *g, int nbytes)
+void *
+guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
{
void *ptr = malloc (nbytes);
- if (!ptr) g->abort_fn ();
+ if (nbytes > 0 && !ptr) g->abort_cb ();
return ptr;
}
-static void *
-safe_realloc (guestfs_h *g, void *ptr, int nbytes)
+void *
+guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
{
void *p = realloc (ptr, nbytes);
- if (!p) g->abort_fn ();
+ if (nbytes > 0 && !p) g->abort_cb ();
return p;
}
-static char *
-safe_strdup (guestfs_h *g, const char *str)
+char *
+guestfs_safe_strdup (guestfs_h *g, const char *str)
{
char *s = strdup (str);
- if (!s) g->abort_fn ();
+ if (!s) g->abort_cb ();
return s;
}
+void *
+guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
+{
+ void *p = malloc (size);
+ if (!p) g->abort_cb ();
+ memcpy (p, ptr, size);
+ return p;
+}
+
+static int
+xwrite (int fd, const void *buf, size_t len)
+{
+ int r;
+
+ while (len > 0) {
+ r = write (fd, buf, len);
+ if (r == -1)
+ return -1;
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
+static int
+xread (int fd, void *buf, size_t len)
+{
+ int r;
+
+ while (len > 0) {
+ r = read (fd, buf, len);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ return -1;
+ }
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
void
-guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_fn a)
+guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
{
- g->abort_fn = a;
+ g->abort_cb = cb;
}
-guestfs_abort_fn
+guestfs_abort_cb
guestfs_get_out_of_memory_handler (guestfs_h *g)
{
- return g->abort_fn;
+ return g->abort_cb;
}
void
-guestfs_set_exit_on_error (guestfs_h *g, int e)
+guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
{
- g->exit_on_error = e;
+ g->error_cb = cb;
+ g->error_cb_data = data;
}
-int
-guestfs_get_exit_on_error (guestfs_h *g)
+guestfs_error_handler_cb
+guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
{
- return g->exit_on_error;
+ if (data_rtn) *data_rtn = g->error_cb_data;
+ return g->error_cb;
}
-void
+int
guestfs_set_verbose (guestfs_h *g, int v)
{
- g->verbose = v;
+ g->verbose = !!v;
+ return 0;
}
int
return g->verbose;
}
-/* Add an escaped string to the current command line. */
-static int
-add_cmdline (guestfs_h *g, const char *str)
+int
+guestfs_set_autosync (guestfs_h *g, int a)
+{
+ g->autosync = !!a;
+ return 0;
+}
+
+int
+guestfs_get_autosync (guestfs_h *g)
+{
+ return g->autosync;
+}
+
+int
+guestfs_set_path (guestfs_h *g, const char *path)
+{
+ free (g->path);
+ g->path = NULL;
+
+ g->path =
+ path == NULL ?
+ safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
+ return 0;
+}
+
+const char *
+guestfs_get_path (guestfs_h *g)
+{
+ return g->path;
+}
+
+int
+guestfs_set_qemu (guestfs_h *g, const char *qemu)
+{
+ free (g->qemu);
+ g->qemu = NULL;
+
+ g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
+ return 0;
+}
+
+const char *
+guestfs_get_qemu (guestfs_h *g)
+{
+ return g->qemu;
+}
+
+int
+guestfs_set_append (guestfs_h *g, const char *append)
+{
+ free (g->append);
+ g->append = NULL;
+
+ g->append = append ? safe_strdup (g, append) : NULL;
+ return 0;
+}
+
+const char *
+guestfs_get_append (guestfs_h *g)
+{
+ return g->append;
+}
+
+/* Add a string to the current command line. */
+static void
+incr_cmdline_size (guestfs_h *g)
{
- if (g->pid >= 0)
- return error (g, "command line cannot be altered after qemu subprocess launched");
+ if (g->cmdline == NULL) {
+ /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
+ g->cmdline_size = 1;
+ g->cmdline = safe_malloc (g, sizeof (char *));
+ g->cmdline[0] = NULL;
+ }
g->cmdline_size++;
g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
- g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
+}
+static int
+add_cmdline (guestfs_h *g, const char *str)
+{
+ if (g->state != CONFIG) {
+ error (g,
+ _("command line cannot be altered after qemu subprocess launched"));
+ return -1;
+ }
+
+ incr_cmdline_size (g);
+ g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
return 0;
}
guestfs_config (guestfs_h *g,
const char *qemu_param, const char *qemu_value)
{
- if (qemu_param[0] != '-')
- return error (g, "guestfs_config: parameter must begin with '-' character");
+ if (qemu_param[0] != '-') {
+ error (g, _("guestfs_config: parameter must begin with '-' character"));
+ return -1;
+ }
/* A bit fascist, but the user will probably break the extra
* parameters that we add if they try to set any of these.
strcmp (qemu_param, "-vnc") == 0 ||
strcmp (qemu_param, "-full-screen") == 0 ||
strcmp (qemu_param, "-std-vga") == 0 ||
- strcmp (qemu_param, "-vnc") == 0)
- return error (g, "guestfs_config: parameter '%s' isn't allowed");
+ strcmp (qemu_param, "-vnc") == 0) {
+ error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
+ return -1;
+ }
if (add_cmdline (g, qemu_param) != 0) return -1;
int
guestfs_add_drive (guestfs_h *g, const char *filename)
{
- int len = strlen (filename) + 64;
+ size_t len = strlen (filename) + 64;
char buf[len];
- if (strchr (filename, ',') != NULL)
- return error (g, "filename cannot contain ',' (comma) character");
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
- snprintf (buf, len, "file=%s,media=disk", filename);
+ snprintf (buf, len, "file=%s", filename);
return guestfs_config (g, "-drive", buf);
}
int
-guestfs_add_cdrom (guestfs_h *g, const char *filename)
+guestfs_add_drive_ro (guestfs_h *g, const char *filename)
{
- int len = strlen (filename) + 64;
+ size_t len = strlen (filename) + 64;
char buf[len];
- if (strchr (filename, ',') != NULL)
- return error (g, "filename cannot contain ',' (comma) character");
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
- snprintf (buf, len, "file=%s,if=ide,index=1,media=cdrom", filename);
+ snprintf (buf, len, "file=%s,snapshot=on", filename);
return guestfs_config (g, "-drive", buf);
}
int
+guestfs_add_cdrom (guestfs_h *g, const char *filename)
+{
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+
+ return guestfs_config (g, "-cdrom", filename);
+}
+
+int
guestfs_launch (guestfs_h *g)
{
static const char *dir_template = "/tmp/libguestfsXXXXXX";
- int r, i;
- const char *qemu = QEMU; /* XXX */
- const char *kernel = "/boot/vmlinuz-2.6.27.15-170.2.24.fc10.x86_64";
- const char *initrd = "/boot/initrd-2.6.27.15-170.2.24.fc10.x86_64.img";
+ int r, i, pmore, memsize;
+ size_t len;
+ int wfd[2], rfd[2];
+ int tries;
+ const char *kernel_name = "vmlinuz." REPO "." host_cpu;
+ const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
+ char *path, *pelem, *pend;
+ char *kernel = NULL, *initrd = NULL;
char unixsock[256];
- char vmchannel[256];
- char tmpfile[256];
+ struct sockaddr_un addr;
+
+ /* Configured? */
+ if (!g->cmdline) {
+ error (g, _("you must call guestfs_add_drive before guestfs_launch"));
+ return -1;
+ }
+
+ if (g->state != CONFIG) {
+ error (g, _("qemu has already been launched"));
+ return -1;
+ }
- /* XXX Choose which qemu to run. */
- /* XXX Choose initrd, etc. */
+ /* Search g->path for the kernel and initrd. */
+ pelem = path = safe_strdup (g, g->path);
+ do {
+ pend = strchrnul (pelem, ':');
+ pmore = *pend == ':';
+ *pend = '\0';
+ len = pend - pelem;
+
+ /* Empty element or "." means cwd. */
+ if (len == 0 || (len == 1 && *pelem == '.')) {
+ if (g->verbose)
+ fprintf (stderr,
+ "looking for kernel and initrd in current directory\n");
+ if (access (kernel_name, F_OK) == 0 && access (initrd_name, F_OK) == 0) {
+ kernel = safe_strdup (g, kernel_name);
+ initrd = safe_strdup (g, initrd_name);
+ break;
+ }
+ }
+ /* Look at <path>/kernel etc. */
+ else {
+ kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
+ initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
+ sprintf (kernel, "%s/%s", pelem, kernel_name);
+ sprintf (initrd, "%s/%s", pelem, initrd_name);
+
+ if (g->verbose)
+ fprintf (stderr, "looking for %s and %s\n", kernel, initrd);
+
+ if (access (kernel, F_OK) == 0 && access (initrd, F_OK) == 0)
+ break;
+ free (kernel);
+ free (initrd);
+ kernel = initrd = NULL;
+ }
+
+ pelem = pend + 1;
+ } while (pmore);
+
+ free (path);
+
+ if (kernel == NULL || initrd == NULL) {
+ error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
+ kernel_name, initrd_name, g->path);
+ goto cleanup0;
+ }
+
+ /* Choose a suitable memory size. Previously we tried to choose
+ * a minimal memory size, but this isn't really necessary since
+ * recent QEMU and KVM don't do anything nasty like locking
+ * memory into core any more. This we can safely choose a
+ * large, generous amount of memory, and it'll just get swapped
+ * on smaller systems.
+ */
+ memsize = 384;
- /* Make the temporary directory containing the logfile and socket. */
+ /* Make the temporary directory containing the socket. */
if (!g->tmpdir) {
g->tmpdir = safe_strdup (g, dir_template);
- if (mkdtemp (g->tmpdir) == NULL)
- return perrorf (g, "%s: cannot create temporary directory", dir_template);
+ if (mkdtemp (g->tmpdir) == NULL) {
+ perrorf (g, _("%s: cannot create temporary directory"), dir_template);
+ goto cleanup0;
+ }
+ }
- snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
+ snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
+ unlink (unixsock);
+
+ if (pipe (wfd) == -1 || pipe (rfd) == -1) {
+ perrorf (g, "pipe");
+ goto cleanup0;
}
r = fork ();
- if (r == -1)
- return perrorf (g, "fork");
+ if (r == -1) {
+ perrorf (g, "fork");
+ close (wfd[0]);
+ close (wfd[1]);
+ close (rfd[0]);
+ close (rfd[1]);
+ goto cleanup0;
+ }
- if (r > 0) { /* Parent (library). */
- g->pid = r;
+ if (r == 0) { /* Child (qemu). */
+ char vmchannel[256];
+ char append[256];
+ char memsize_str[256];
- /* If qemu is going to die during startup, give it a tiny amount of
- * time to print the error message.
- */
- usleep (10000);
- } else { /* Child (qemu). */
/* Set up the full command line. Do this in the subprocess so we
* don't need to worry about cleaning up.
*/
- g->cmdline[0] = (char *) qemu;
-
- g->cmdline = realloc (g->cmdline, sizeof (char *) * (g->cmdline_size + 14));
- if (g->cmdline == NULL) {
- perror ("realloc");
- _exit (1);
- }
+ g->cmdline[0] = g->qemu;
+ /* Construct the -net channel parameter for qemu. */
snprintf (vmchannel, sizeof vmchannel,
- "channel,%d:unix:%s,server,nowait", 666, unixsock);
-
- g->cmdline[g->cmdline_size ] = "-kernel";
- g->cmdline[g->cmdline_size+ 1] = (char *) kernel;
- g->cmdline[g->cmdline_size+ 2] = "-initrd";
- g->cmdline[g->cmdline_size+ 3] = (char *) initrd;
- g->cmdline[g->cmdline_size+ 4] = "-append";
- g->cmdline[g->cmdline_size+ 5] = "console=ttyS0";
- g->cmdline[g->cmdline_size+ 6] = "-nographic";
- g->cmdline[g->cmdline_size+ 7] = "-serial";
- g->cmdline[g->cmdline_size+ 8] = "stdio";
- g->cmdline[g->cmdline_size+ 9] = "-net";
- g->cmdline[g->cmdline_size+10] = vmchannel;
- g->cmdline[g->cmdline_size+11] = "-net";
- g->cmdline[g->cmdline_size+12] = "user,vlan0";
- g->cmdline[g->cmdline_size+13] = NULL;
+ "channel,%d:unix:%s,server,nowait",
+ VMCHANNEL_PORT, unixsock);
+
+ /* Linux kernel command line. */
+ snprintf (append, sizeof append,
+ "panic=1 console=ttyS0 guestfs=%s:%d%s%s%s",
+ VMCHANNEL_ADDR, VMCHANNEL_PORT,
+ g->verbose ? " guestfs_verbose=1" : "",
+ g->append ? " " : "", g->append ? g->append : "");
+
+ snprintf (memsize_str, sizeof memsize_str, "%d", memsize);
+
+ add_cmdline (g, "-m");
+ add_cmdline (g, memsize_str);
+#if 0
+ add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
+#endif
+ add_cmdline (g, "-no-reboot"); /* Force exit instead of reboot on panic */
+ add_cmdline (g, "-kernel");
+ add_cmdline (g, (char *) kernel);
+ add_cmdline (g, "-initrd");
+ add_cmdline (g, (char *) initrd);
+ add_cmdline (g, "-append");
+ add_cmdline (g, append);
+ add_cmdline (g, "-nographic");
+ add_cmdline (g, "-serial");
+ add_cmdline (g, "stdio");
+ add_cmdline (g, "-net");
+ add_cmdline (g, vmchannel);
+ add_cmdline (g, "-net");
+ add_cmdline (g, "user,vlan=0");
+ add_cmdline (g, "-net");
+ add_cmdline (g, "nic,model=virtio,vlan=0");
+ incr_cmdline_size (g);
+ g->cmdline[g->cmdline_size-1] = NULL;
if (g->verbose) {
- fprintf (stderr, "Running %s", qemu);
+ fprintf (stderr, "%s", g->qemu);
for (i = 0; g->cmdline[i]; ++i)
fprintf (stderr, " %s", g->cmdline[i]);
fprintf (stderr, "\n");
}
- /* Set up stdin, stdout. Messages should go to the logfile. */
+ /* Set up stdin, stdout. */
close (0);
close (1);
- open ("/dev/null", O_RDONLY);
- snprintf (tmpfile, sizeof tmpfile, "%s/qemu.log", g->tmpdir);
- open (tmpfile, O_WRONLY|O_CREAT|O_APPEND, 0644);
- /*dup2 (1, 2);*/
+ close (wfd[1]);
+ close (rfd[0]);
+ dup (wfd[0]);
+ dup (rfd[1]);
+ close (wfd[0]);
+ close (rfd[1]);
+
+#if 0
+ /* Set up a new process group, so we can signal this process
+ * and all subprocesses (eg. if qemu is really a shell script).
+ */
+ setpgid (0, 0);
+#endif
- execv (qemu, g->cmdline); /* Run qemu. */
- perror (qemu);
+ execv (g->qemu, g->cmdline); /* Run qemu. */
+ perror (g->qemu);
_exit (1);
}
+ /* Parent (library). */
+ g->pid = r;
+
+ free (kernel);
+ kernel = NULL;
+ free (initrd);
+ initrd = NULL;
+
+ /* Fork the recovery process off which will kill qemu if the parent
+ * process fails to do so (eg. if the parent segfaults).
+ */
+ r = fork ();
+ if (r == 0) {
+ pid_t qemu_pid = g->pid;
+ pid_t parent_pid = getppid ();
+
+ /* Writing to argv is hideously complicated and error prone. See:
+ * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
+ */
+
+ /* Loop around waiting for one or both of the other processes to
+ * disappear. It's fair to say this is very hairy. The PIDs that
+ * we are looking at might be reused by another process. We are
+ * effectively polling. Is the cure worse than the disease?
+ */
+ for (;;) {
+ if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
+ _exit (0);
+ if (kill (parent_pid, 0) == -1) {
+ /* Parent's gone away, qemu still around, so kill qemu. */
+ kill (qemu_pid, 9);
+ _exit (0);
+ }
+ sleep (2);
+ }
+ }
+
+ /* Don't worry, if the fork failed, this will be -1. The recovery
+ * process isn't essential.
+ */
+ g->recoverypid = r;
+
+ /* Start the clock ... */
+ time (&g->start_t);
+
+ /* Close the other ends of the pipe. */
+ close (wfd[0]);
+ close (rfd[1]);
+
+ if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
+ fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
+ perrorf (g, "fcntl");
+ goto cleanup1;
+ }
+
+ g->fd[0] = wfd[1]; /* stdin of child */
+ g->fd[1] = rfd[0]; /* stdout of child */
+
+ /* Open the Unix socket. The vmchannel implementation that got
+ * merged with qemu sucks in a number of ways. Both ends do
+ * connect(2), which means that no one knows what, if anything, is
+ * connected to the other end, or if it becomes disconnected. Even
+ * worse, we have to wait some indeterminate time for qemu to create
+ * the socket and connect to it (which happens very early in qemu's
+ * start-up), so any code that uses vmchannel is inherently racy.
+ * Hence this silly loop.
+ */
+ g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
+ if (g->sock == -1) {
+ perrorf (g, "socket");
+ goto cleanup1;
+ }
+
+ if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
+ perrorf (g, "fcntl");
+ goto cleanup2;
+ }
+
+ addr.sun_family = AF_UNIX;
+ strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX-1] = '\0';
+
+ tries = 100;
+ /* Always sleep at least once to give qemu a small chance to start up. */
+ usleep (10000);
+ while (tries > 0) {
+ r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
+ if ((r == -1 && errno == EINPROGRESS) || r == 0)
+ goto connected;
+
+ if (errno != ENOENT)
+ perrorf (g, "connect");
+ tries--;
+ usleep (100000);
+ }
+
+ error (g, _("failed to connect to vmchannel socket"));
+ goto cleanup2;
+
+ connected:
+ /* Watch the file descriptors. */
+ free (g->msg_in);
+ g->msg_in = NULL;
+ g->msg_in_size = g->msg_in_allocated = 0;
+
+ free (g->msg_out);
+ g->msg_out = NULL;
+ g->msg_out_size = 0;
+ g->msg_out_pos = 0;
+
+ g->stdout_watch =
+ g->main_loop->add_handle (g->main_loop, g, g->fd[1],
+ GUESTFS_HANDLE_READABLE,
+ stdout_event, NULL);
+ if (g->stdout_watch == -1) {
+ error (g, _("could not watch qemu stdout"));
+ goto cleanup3;
+ }
+
+ if (guestfs__switch_to_receiving (g) == -1)
+ goto cleanup3;
+
+ g->state = LAUNCHING;
return 0;
+
+ cleanup3:
+ if (g->stdout_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
+ if (g->sock_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
+
+ cleanup2:
+ close (g->sock);
+
+ cleanup1:
+ close (wfd[1]);
+ close (rfd[0]);
+ kill (g->pid, 9);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+ g->pid = 0;
+ g->recoverypid = 0;
+ g->start_t = 0;
+ g->stdout_watch = -1;
+ g->sock_watch = -1;
+
+ cleanup0:
+ free (kernel);
+ free (initrd);
+ return -1;
}
-#define UNIX_PATH_MAX 108
+static void
+finish_wait_ready (guestfs_h *g, void *vp)
+{
+ if (g->verbose)
+ fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
+
+ *((int *)vp) = 1;
+ g->main_loop->main_loop_quit (g->main_loop, g);
+}
int
guestfs_wait_ready (guestfs_h *g)
{
- int r, i, lsock;
- struct sockaddr_un addr;
+ int finished = 0, r;
- if (guestfs_ready (g)) return 0;
+ if (g->state == READY) return 0;
- /* Launch the subprocess, if there isn't one already. */
- if (g->pid == -1) {
- if (guestfs_launch (g) != 0)
- return -1;
+ if (g->state == BUSY) {
+ error (g, _("qemu has finished launching already"));
+ return -1;
}
- if (g->sock >= 0) {
- close (g->sock);
- g->sock = -1;
+ if (g->state != LAUNCHING) {
+ error (g, _("qemu has not been launched yet"));
+ return -1;
}
- lsock = socket (AF_UNIX, SOCK_STREAM, 0);
- if (lsock == -1)
- return perrorf (g, "socket");
+ g->launch_done_cb = finish_wait_ready;
+ g->launch_done_cb_data = &finished;
+ r = g->main_loop->main_loop_run (g->main_loop, g);
+ g->launch_done_cb = NULL;
+ g->launch_done_cb_data = NULL;
- addr.sun_family = AF_UNIX;
- snprintf (addr.sun_path, UNIX_PATH_MAX, "%s/sock", g->tmpdir);
+ if (r == -1) return -1;
- if (bind (lsock, (struct sockaddr *) &addr, sizeof addr) == -1) {
- perrorf (g, "bind");
- close (lsock);
+ if (finished != 1) {
+ error (g, _("guestfs_wait_ready failed, see earlier error messages"));
return -1;
}
- if (listen (lsock, 1) == -1) {
- perrorf (g, "listen");
- close (lsock);
+ /* This is possible in some really strange situations, such as
+ * guestfsd starts up OK but then qemu immediately exits. Check for
+ * it because the caller is probably expecting to be able to send
+ * commands after this function returns.
+ */
+ if (g->state != READY) {
+ error (g, _("qemu launched and contacted daemon, but state != READY"));
return -1;
}
- if (fcntl (lsock, F_SETFL, O_NONBLOCK) == -1) {
- perrorf (g, "set socket non-blocking");
- close (lsock);
+ return 0;
+}
+
+int
+guestfs_kill_subprocess (guestfs_h *g)
+{
+ if (g->state == CONFIG) {
+ error (g, _("no subprocess to kill"));
return -1;
}
- /* Wait until the daemon running inside the guest connects to the
- * Unix socket, which indicates it's alive. Qemu might exit in the
- * meantime if there is a problem. More problematically qemu might
- * hang, which we can only detect by timeout.
- */
- for (i = 0; i < 30; ++i) {
- r = waitpid (g->pid, NULL, WNOHANG);
-
- if (r > 0 || (r == -1 && errno == ECHILD)) {
- error (g, "qemu subprocess exited unexpectedly during initialization");
- g->pid = -1;
- cleanup_fds (g);
- close (lsock);
- return -1;
- }
+ if (g->verbose)
+ fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
- r = accept (lsock, NULL, 0);
- if (r >= 0) {
- g->sock = r;
- fcntl (g->sock, F_SETFL, O_NONBLOCK);
- close (lsock);
- return 0;
- }
- if (errno == EAGAIN) {
- sleep (1);
- continue;
- }
- perrorf (g, "accept");
- close (lsock);
- guestfs_kill_subprocess (g);
- return -1;
- }
+ kill (g->pid, SIGTERM);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
- close (lsock);
- return error (g, "timeout waiting for guest to become ready");
+ return 0;
}
+/* Access current state. */
int
-guestfs_ready (guestfs_h *g)
+guestfs_is_config (guestfs_h *g)
{
- return
- g->pid >= 0 &&
- kill (g->pid, 0) == 0 &&
- g->sock >= 0 /* &&
- guestfs_ping_daemon (g) >= 0 */;
+ return g->state == CONFIG;
}
int
-guestfs_kill_subprocess (guestfs_h *g)
+guestfs_is_launching (guestfs_h *g)
{
- if (g->pid >= 0) {
- if (g->verbose)
- fprintf (stderr, "sending SIGINT to pid %d\n", g->pid);
+ return g->state == LAUNCHING;
+}
- kill (g->pid, SIGINT);
- wait_subprocess (g);
+int
+guestfs_is_ready (guestfs_h *g)
+{
+ return g->state == READY;
+}
+
+int
+guestfs_is_busy (guestfs_h *g)
+{
+ return g->state == BUSY;
+}
+
+int
+guestfs_get_state (guestfs_h *g)
+{
+ return g->state;
+}
+
+int
+guestfs_set_ready (guestfs_h *g)
+{
+ if (g->state != BUSY) {
+ error (g, _("guestfs_set_ready: called when in state %d != BUSY"),
+ g->state);
+ return -1;
+ }
+ g->state = READY;
+ return 0;
+}
+
+int
+guestfs_set_busy (guestfs_h *g)
+{
+ if (g->state != READY) {
+ error (g, _("guestfs_set_busy: called when in state %d != READY"),
+ g->state);
+ return -1;
+ }
+ g->state = BUSY;
+ return 0;
+}
+
+int
+guestfs_end_busy (guestfs_h *g)
+{
+ switch (g->state)
+ {
+ case BUSY:
+ g->state = READY;
+ break;
+ case CONFIG:
+ case READY:
+ break;
+ case LAUNCHING:
+ case NO_HANDLE:
+ error (g, _("guestfs_end_busy: called when in state %d"), g->state);
+ return -1;
+ }
+ return 0;
+}
+
+/* Structure-freeing functions. These rely on the fact that the
+ * structure format is identical to the XDR format. See note in
+ * generator.ml.
+ */
+void
+guestfs_free_int_bool (struct guestfs_int_bool *x)
+{
+ free (x);
+}
+
+void
+guestfs_free_lvm_pv_list (struct guestfs_lvm_pv_list *x)
+{
+ xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_pv_list, (char *) x);
+ free (x);
+}
+
+void
+guestfs_free_lvm_vg_list (struct guestfs_lvm_vg_list *x)
+{
+ xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_vg_list, (char *) x);
+ free (x);
+}
+
+void
+guestfs_free_lvm_lv_list (struct guestfs_lvm_lv_list *x)
+{
+ xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_lv_list, (char *) x);
+ free (x);
+}
+
+/* We don't know if stdout_event or sock_read_event will be the
+ * first to receive EOF if the qemu process dies. This function
+ * has the common cleanup code for both.
+ */
+static void
+child_cleanup (guestfs_h *g)
+{
+ if (g->verbose)
+ fprintf (stderr, "stdout_event: %p: child process died\n", g);
+ /*kill (g->pid, SIGTERM);*/
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+ if (g->stdout_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
+ if (g->sock_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
+ close (g->fd[0]);
+ close (g->fd[1]);
+ close (g->sock);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+ g->pid = 0;
+ g->recoverypid = 0;
+ g->start_t = 0;
+ g->stdout_watch = -1;
+ g->sock_watch = -1;
+ g->state = CONFIG;
+ if (g->subprocess_quit_cb)
+ g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
+}
+
+/* This function is called whenever qemu prints something on stdout.
+ * Qemu's stdout is also connected to the guest's serial console, so
+ * we see kernel messages here too.
+ */
+static void
+stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+ int watch, int fd, int events)
+{
+ char buf[4096];
+ int n;
+
+#if 0
+ if (g->verbose)
+ fprintf (stderr,
+ "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
+ g, g->state, fd, events);
+#endif
+
+ if (g->fd[1] != fd) {
+ error (g, _("stdout_event: internal error: %d != %d"), g->fd[1], fd);
+ return;
+ }
+
+ n = read (fd, buf, sizeof buf);
+ if (n == 0) {
+ /* Hopefully this indicates the qemu child process has died. */
+ child_cleanup (g);
+ return;
+ }
+
+ if (n == -1) {
+ if (errno != EINTR && errno != EAGAIN)
+ perrorf (g, "read");
+ return;
+ }
+
+ /* In verbose mode, copy all log messages to stderr. */
+ if (g->verbose)
+ write (2, buf, n);
+
+ /* It's an actual log message, send it upwards if anyone is listening. */
+ if (g->log_message_cb)
+ g->log_message_cb (g, g->log_message_cb_data, buf, n);
+}
+
+/* The function is called whenever we can read something on the
+ * guestfsd (daemon inside the guest) communication socket.
+ */
+static void
+sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+ int watch, int fd, int events)
+{
+ XDR xdr;
+ u_int32_t len;
+ int n;
+
+ if (g->verbose)
+ fprintf (stderr,
+ "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
+ g, g->state, fd, events);
+
+ if (g->sock != fd) {
+ error (g, _("sock_read_event: internal error: %d != %d"), g->sock, fd);
+ return;
+ }
+
+ if (g->msg_in_size <= g->msg_in_allocated) {
+ g->msg_in_allocated += 4096;
+ g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
+ }
+ n = read (g->sock, g->msg_in + g->msg_in_size,
+ g->msg_in_allocated - g->msg_in_size);
+ if (n == 0) {
+ /* Disconnected. */
+ child_cleanup (g);
+ return;
+ }
+
+ if (n == -1) {
+ if (errno != EINTR && errno != EAGAIN)
+ perrorf (g, "read");
+ return;
+ }
+
+ g->msg_in_size += n;
+
+ /* Have we got enough of a message to be able to process it yet? */
+ again:
+ if (g->msg_in_size < 4) return;
+
+ xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
+ if (!xdr_uint32_t (&xdr, &len)) {
+ error (g, _("can't decode length word"));
+ goto cleanup;
+ }
+
+ /* Length is normally the length of the message, but when guestfsd
+ * starts up it sends a "magic" value (longer than any possible
+ * message). Check for this.
+ */
+ if (len == GUESTFS_LAUNCH_FLAG) {
+ if (g->state != LAUNCHING)
+ error (g, _("received magic signature from guestfsd, but in state %d"),
+ g->state);
+ else if (g->msg_in_size != 4)
+ error (g, _("received magic signature from guestfsd, but msg size is %d"),
+ g->msg_in_size);
+ else {
+ g->state = READY;
+ if (g->launch_done_cb)
+ g->launch_done_cb (g, g->launch_done_cb_data);
+ }
+
+ goto cleanup;
+ }
+
+ /* This can happen if a cancellation happens right at the end
+ * of us sending a FileIn parameter to the daemon. Discard. The
+ * daemon should send us an error message next.
+ */
+ if (len == GUESTFS_CANCEL_FLAG) {
+ g->msg_in_size -= 4;
+ memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
+ goto again;
+ }
+
+ /* If this happens, it's pretty bad and we've probably lost
+ * synchronization.
+ */
+ if (len > GUESTFS_MESSAGE_MAX) {
+ error (g, _("message length (%u) > maximum possible size (%d)"),
+ len, GUESTFS_MESSAGE_MAX);
+ goto cleanup;
+ }
+
+ if (g->msg_in_size-4 < len) return; /* Need more of this message. */
+
+ /* Got the full message, begin processing it. */
+#if 0
+ if (g->verbose) {
+ int i, j;
+
+ for (i = 0; i < g->msg_in_size; i += 16) {
+ printf ("%04x: ", i);
+ for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
+ printf ("%02x ", (unsigned char) g->msg_in[j]);
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|");
+ for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
+ if (isprint (g->msg_in[j]))
+ printf ("%c", g->msg_in[j]);
+ else
+ printf (".");
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|\n");
+ }
+ }
+#endif
+
+ /* Not in the expected state. */
+ if (g->state != BUSY)
+ error (g, _("state %d != BUSY"), g->state);
+
+ /* Push the message up to the higher layer. */
+ if (g->reply_cb)
+ g->reply_cb (g, g->reply_cb_data, &xdr);
+ else
+ /* This message (probably) should never be printed. */
+ fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
+
+ g->msg_in_size -= len + 4;
+ memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
+ if (g->msg_in_size > 0) goto again;
+
+ cleanup:
+ /* Free the message buffer if it's grown excessively large. */
+ if (g->msg_in_allocated > 65536) {
+ free (g->msg_in);
+ g->msg_in = NULL;
+ g->msg_in_size = g->msg_in_allocated = 0;
+ } else
+ g->msg_in_size = 0;
+
+ xdr_destroy (&xdr);
+}
+
+/* The function is called whenever we can write something on the
+ * guestfsd (daemon inside the guest) communication socket.
+ */
+static void
+sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+ int watch, int fd, int events)
+{
+ int n;
+
+ if (g->verbose)
+ fprintf (stderr,
+ "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
+ g, g->state, fd, events);
+
+ if (g->sock != fd) {
+ error (g, _("sock_write_event: internal error: %d != %d"), g->sock, fd);
+ return;
+ }
+
+ if (g->state != BUSY) {
+ error (g, _("sock_write_event: state %d != BUSY"), g->state);
+ return;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
+ g->msg_out_size - g->msg_out_pos);
+
+ n = write (g->sock, g->msg_out + g->msg_out_pos,
+ g->msg_out_size - g->msg_out_pos);
+ if (n == -1) {
+ if (errno != EAGAIN)
+ perrorf (g, "write");
+ return;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
+
+ g->msg_out_pos += n;
+
+ /* More to write? */
+ if (g->msg_out_pos < g->msg_out_size)
+ return;
+
+ if (g->verbose)
+ fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
+
+ free (g->msg_out);
+ g->msg_out = NULL;
+ g->msg_out_pos = g->msg_out_size = 0;
+
+ /* Done writing, call the higher layer. */
+ if (g->send_cb)
+ g->send_cb (g, g->send_cb_data);
+}
+
+void
+guestfs_set_send_callback (guestfs_h *g,
+ guestfs_send_cb cb, void *opaque)
+{
+ g->send_cb = cb;
+ g->send_cb_data = opaque;
+}
+
+void
+guestfs_set_reply_callback (guestfs_h *g,
+ guestfs_reply_cb cb, void *opaque)
+{
+ g->reply_cb = cb;
+ g->reply_cb_data = opaque;
+}
+
+void
+guestfs_set_log_message_callback (guestfs_h *g,
+ guestfs_log_message_cb cb, void *opaque)
+{
+ g->log_message_cb = cb;
+ g->log_message_cb_data = opaque;
+}
+
+void
+guestfs_set_subprocess_quit_callback (guestfs_h *g,
+ guestfs_subprocess_quit_cb cb, void *opaque)
+{
+ g->subprocess_quit_cb = cb;
+ g->subprocess_quit_cb_data = opaque;
+}
+
+void
+guestfs_set_launch_done_callback (guestfs_h *g,
+ guestfs_launch_done_cb cb, void *opaque)
+{
+ g->launch_done_cb = cb;
+ g->launch_done_cb_data = opaque;
+}
+
+/* Access to the handle's main loop and the default main loop. */
+void
+guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
+{
+ g->main_loop = main_loop;
+}
+
+guestfs_main_loop *
+guestfs_get_main_loop (guestfs_h *g)
+{
+ return g->main_loop;
+}
+
+guestfs_main_loop *
+guestfs_get_default_main_loop (void)
+{
+ return (guestfs_main_loop *) &default_main_loop;
+}
+
+/* Change the daemon socket handler so that we are now writing.
+ * This sets the handle to sock_write_event.
+ */
+int
+guestfs__switch_to_sending (guestfs_h *g)
+{
+ if (g->sock_watch >= 0) {
+ if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+ error (g, _("remove_handle failed"));
+ g->sock_watch = -1;
+ return -1;
+ }
+ }
+
+ g->sock_watch =
+ g->main_loop->add_handle (g->main_loop, g, g->sock,
+ GUESTFS_HANDLE_WRITABLE,
+ sock_write_event, NULL);
+ if (g->sock_watch == -1) {
+ error (g, _("add_handle failed"));
+ return -1;
}
- cleanup_fds (g);
+ return 0;
+}
+
+int
+guestfs__switch_to_receiving (guestfs_h *g)
+{
+ if (g->sock_watch >= 0) {
+ if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+ error (g, _("remove_handle failed"));
+ g->sock_watch = -1;
+ return -1;
+ }
+ }
+
+ g->sock_watch =
+ g->main_loop->add_handle (g->main_loop, g, g->sock,
+ GUESTFS_HANDLE_READABLE,
+ sock_read_event, NULL);
+ if (g->sock_watch == -1) {
+ error (g, _("add_handle failed"));
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Dispatch a call (len + header + args) to the remote daemon,
+ * synchronously (ie. using the guest's main loop to wait until
+ * it has been sent). Returns -1 for error, or the serial
+ * number of the message.
+ */
+static void
+send_cb (guestfs_h *g, void *data)
+{
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+ *((int *)data) = 1;
+ ml->main_loop_quit (ml, g);
+}
+
+int
+guestfs__send_sync (guestfs_h *g, int proc_nr,
+ xdrproc_t xdrp, char *args)
+{
+ struct guestfs_message_header hdr;
+ XDR xdr;
+ u_int32_t len;
+ int serial = g->msg_next_serial++;
+ int sent;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+ if (g->state != BUSY) {
+ error (g, _("guestfs__send_sync: state %d != BUSY"), g->state);
+ return -1;
+ }
+
+ /* This is probably an internal error. Or perhaps we should just
+ * free the buffer anyway?
+ */
+ if (g->msg_out != NULL) {
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ return -1;
+ }
+
+ /* We have to allocate this message buffer on the heap because
+ * it is quite large (although will be mostly unused). We
+ * can't allocate it on the stack because in some environments
+ * we have quite limited stack space available, notably when
+ * running in the JVM.
+ */
+ g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
+ xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
+
+ /* Serialize the header. */
+ hdr.prog = GUESTFS_PROGRAM;
+ hdr.vers = GUESTFS_PROTOCOL_VERSION;
+ hdr.proc = proc_nr;
+ hdr.direction = GUESTFS_DIRECTION_CALL;
+ hdr.serial = serial;
+ hdr.status = GUESTFS_STATUS_OK;
+
+ if (!xdr_guestfs_message_header (&xdr, &hdr)) {
+ error (g, _("xdr_guestfs_message_header failed"));
+ goto cleanup1;
+ }
+
+ /* Serialize the args. If any, because some message types
+ * have no parameters.
+ */
+ if (xdrp) {
+ if (!(*xdrp) (&xdr, args)) {
+ error (g, _("dispatch failed to marshal args"));
+ goto cleanup1;
+ }
+ }
+
+ /* Get the actual length of the message, resize the buffer to match
+ * the actual length, and write the length word at the beginning.
+ */
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ g->msg_out = safe_realloc (g, g->msg_out, len + 4);
+ g->msg_out_size = len + 4;
+ g->msg_out_pos = 0;
+
+ xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+
+ if (guestfs__switch_to_sending (g) == -1)
+ goto cleanup1;
+
+ sent = 0;
+ guestfs_set_send_callback (g, send_cb, &sent);
+ if (ml->main_loop_run (ml, g) == -1)
+ goto cleanup1;
+ if (sent != 1) {
+ error (g, _("send failed, see earlier error messages"));
+ goto cleanup1;
+ }
+
+ return serial;
+
+ cleanup1:
+ free (g->msg_out);
+ g->msg_out = NULL;
+ g->msg_out_size = 0;
+ return -1;
+}
+
+static int cancel = 0; /* XXX Implement file cancellation. */
+static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
+static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
+static int send_file_cancellation_sync (guestfs_h *g);
+static int send_file_complete_sync (guestfs_h *g);
+
+/* Synchronously send a file.
+ * Returns:
+ * 0 OK
+ * -1 error
+ * -2 daemon cancelled (we must read the error message)
+ */
+int
+guestfs__send_file_sync (guestfs_h *g, const char *filename)
+{
+ char buf[GUESTFS_MAX_CHUNK_SIZE];
+ int fd, r, err;
+
+ fd = open (filename, O_RDONLY);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ send_file_cancellation_sync (g);
+ /* Daemon sees cancellation and won't reply, so caller can
+ * just return here.
+ */
+ return -1;
+ }
+
+ /* Send file in chunked encoding. */
+ while (!cancel) {
+ r = read (fd, buf, sizeof buf);
+ if (r == -1 && (errno == EINTR || errno == EAGAIN))
+ continue;
+ if (r <= 0) break;
+ err = send_file_data_sync (g, buf, r);
+ if (err < 0) {
+ if (err == -2) /* daemon sent cancellation */
+ send_file_cancellation_sync (g);
+ return err;
+ }
+ }
+
+ if (cancel) { /* cancel from either end */
+ send_file_cancellation_sync (g);
+ return -1;
+ }
+
+ if (r == -1) {
+ perrorf (g, "read: %s", filename);
+ send_file_cancellation_sync (g);
+ return -1;
+ }
+
+ /* End of file, but before we send that, we need to close
+ * the file and check for errors.
+ */
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ send_file_cancellation_sync (g);
+ return -1;
+ }
+
+ return send_file_complete_sync (g);
+}
+
+/* Send a chunk of file data. */
+static int
+send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
+{
+ return send_file_chunk_sync (g, 0, buf, len);
+}
+
+/* Send a cancellation message. */
+static int
+send_file_cancellation_sync (guestfs_h *g)
+{
+ return send_file_chunk_sync (g, 1, NULL, 0);
+}
+
+/* Send a file complete chunk. */
+static int
+send_file_complete_sync (guestfs_h *g)
+{
+ char buf[1];
+ return send_file_chunk_sync (g, 0, buf, 0);
+}
+
+/* Send a chunk, cancellation or end of file, synchronously (ie. wait
+ * for it to go).
+ */
+static int check_for_daemon_cancellation (guestfs_h *g);
+
+static int
+send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
+{
+ u_int32_t len;
+ int sent;
+ guestfs_chunk chunk;
+ XDR xdr;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+ if (g->state != BUSY) {
+ error (g, _("send_file_chunk_sync: state %d != READY"), g->state);
+ return -1;
+ }
+
+ /* This is probably an internal error. Or perhaps we should just
+ * free the buffer anyway?
+ */
+ if (g->msg_out != NULL) {
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ return -1;
+ }
+
+ /* Did the daemon send a cancellation message? */
+ if (check_for_daemon_cancellation (g)) {
+ if (g->verbose)
+ fprintf (stderr, "got daemon cancellation\n");
+ return -2;
+ }
+
+ /* Allocate the chunk buffer. Don't use the stack to avoid
+ * excessive stack usage and unnecessary copies.
+ */
+ g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
+ xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
+
+ /* Serialize the chunk. */
+ chunk.cancel = cancel;
+ chunk.data.data_len = buflen;
+ chunk.data.data_val = (char *) buf;
+
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
+ buf, buflen);
+ xdr_destroy (&xdr);
+ goto cleanup1;
+ }
+
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ /* Reduce the size of the outgoing message buffer to the real length. */
+ g->msg_out = safe_realloc (g, g->msg_out, len + 4);
+ g->msg_out_size = len + 4;
+ g->msg_out_pos = 0;
+
+ xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+
+ if (guestfs__switch_to_sending (g) == -1)
+ goto cleanup1;
+
+ sent = 0;
+ guestfs_set_send_callback (g, send_cb, &sent);
+ if (ml->main_loop_run (ml, g) == -1)
+ goto cleanup1;
+ if (sent != 1) {
+ error (g, _("send file chunk failed, see earlier error messages"));
+ goto cleanup1;
+ }
+
+ return 0;
+
+ cleanup1:
+ free (g->msg_out);
+ g->msg_out = NULL;
+ g->msg_out_size = 0;
+ return -1;
+}
+
+/* At this point we are sending FileIn file(s) to the guest, and not
+ * expecting to read anything, so if we do read anything, it must be
+ * a cancellation message. This checks for this case without blocking.
+ */
+static int
+check_for_daemon_cancellation (guestfs_h *g)
+{
+ fd_set rset;
+ struct timeval tv;
+ int r;
+ char buf[4];
+ uint32_t flag;
+ XDR xdr;
+
+ FD_ZERO (&rset);
+ FD_SET (g->sock, &rset);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ r = select (g->sock+1, &rset, NULL, NULL, &tv);
+ if (r == -1) {
+ perrorf (g, "select");
+ return 0;
+ }
+ if (r == 0)
+ return 0;
+
+ /* Read the message from the daemon. */
+ r = xread (g->sock, buf, sizeof buf);
+ if (r == -1) {
+ perrorf (g, "read");
+ return 0;
+ }
+
+ xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (flag != GUESTFS_CANCEL_FLAG) {
+ error (g, _("check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n"),
+ flag, GUESTFS_CANCEL_FLAG);
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Synchronously receive a file. */
+
+/* Returns -1 = error, 0 = EOF, 1 = more data */
+static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
+
+int
+guestfs__receive_file_sync (guestfs_h *g, const char *filename)
+{
+ void *buf;
+ int fd, r;
+ size_t len;
+
+ fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ goto cancel;
+ }
+
+ /* Receive the file in chunked encoding. */
+ while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
+ if (xwrite (fd, buf, len) == -1) {
+ perrorf (g, "%s: write", filename);
+ free (buf);
+ goto cancel;
+ }
+ free (buf);
+ if (r == 0) break; /* End of file. */
+ }
+
+ if (r == -1) {
+ error (g, _("%s: error in chunked encoding"), filename);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ return -1;
+ }
+
+ return 0;
+
+ cancel: ;
+ /* Send cancellation message to daemon, then wait until it
+ * cancels (just throwing away data).
+ */
+ XDR xdr;
+ char fbuf[4];
+ uint32_t flag = GUESTFS_CANCEL_FLAG;
+
+ xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
+ perrorf (g, _("write to daemon socket"));
+ return -1;
+ }
+
+ while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
+ ; /* just discard it */
+
+ return -1;
+}
+
+/* Note that the reply callback can be called multiple times before
+ * the main loop quits and we get back to the synchronous code. So
+ * we have to be prepared to save multiple chunks on a list here.
+ */
+struct receive_file_ctx {
+ int count; /* 0 if receive_file_cb not called, or
+ * else count number of chunks.
+ */
+ guestfs_chunk *chunks; /* Array of chunks. */
+};
+
+static void
+free_chunks (struct receive_file_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->count; ++i)
+ free (ctx->chunks[i].data.data_val);
+
+ free (ctx->chunks);
+}
+
+static void
+receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
+ guestfs_chunk chunk;
+
+ if (ctx->count == -1) /* Parse error occurred previously. */
+ return;
+
+ ml->main_loop_quit (ml, g);
+
+ memset (&chunk, 0, sizeof chunk);
+
+ if (!xdr_guestfs_chunk (xdr, &chunk)) {
+ error (g, _("failed to parse file chunk"));
+ free_chunks (ctx);
+ ctx->chunks = NULL;
+ ctx->count = -1;
+ return;
+ }
+
+ /* Copy the chunk to the list. */
+ ctx->chunks = safe_realloc (g, ctx->chunks,
+ sizeof (guestfs_chunk) * (ctx->count+1));
+ ctx->chunks[ctx->count] = chunk;
+ ctx->count++;
+}
+
+/* Receive a chunk of file data. */
+/* Returns -1 = error, 0 = EOF, 1 = more data */
+static int
+receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
+{
+ struct receive_file_ctx ctx;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ int i;
+ size_t len;
+
+ ctx.count = 0;
+ ctx.chunks = NULL;
+
+ guestfs_set_reply_callback (g, receive_file_cb, &ctx);
+ (void) ml->main_loop_run (ml, g);
+ guestfs_set_reply_callback (g, NULL, NULL);
+
+ if (ctx.count == 0) {
+ error (g, _("receive_file_data_sync: reply callback not called\n"));
+ return -1;
+ }
+
+ if (ctx.count == -1) {
+ error (g, _("receive_file_data_sync: parse error in reply callback\n"));
+ /* callback already freed the chunks */
+ return -1;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
+
+ /* Process each chunk in the list. */
+ if (buf) *buf = NULL; /* Accumulate data in this buffer. */
+ len = 0;
+
+ for (i = 0; i < ctx.count; ++i) {
+ if (ctx.chunks[i].cancel) {
+ error (g, _("file receive cancelled by daemon"));
+ free_chunks (&ctx);
+ if (buf) free (*buf);
+ if (len_r) *len_r = 0;
+ return -1;
+ }
+
+ if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
+ free_chunks (&ctx);
+ if (len_r) *len_r = len;
+ return 0;
+ }
+
+ if (buf) {
+ *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
+ memcpy (*buf+len, ctx.chunks[i].data.data_val,
+ ctx.chunks[i].data.data_len);
+ }
+ len += ctx.chunks[i].data.data_len;
+ }
+
+ if (len_r) *len_r = len;
+ free_chunks (&ctx);
+ return 1;
+}
+
+/* This is the default main loop implementation, using select(2). */
+
+static int
+select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
+ guestfs_handle_event_cb cb, void *data)
+{
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
+
+ if (fd < 0 || fd >= FD_SETSIZE) {
+ error (g, _("fd %d is out of range"), fd);
+ return -1;
+ }
+
+ if ((events & ~(GUESTFS_HANDLE_READABLE |
+ GUESTFS_HANDLE_WRITABLE |
+ GUESTFS_HANDLE_HANGUP |
+ GUESTFS_HANDLE_ERROR)) != 0) {
+ error (g, _("set of events (0x%x) contains unknown events"), events);
+ return -1;
+ }
+
+ if (events == 0) {
+ error (g, _("set of events is empty"));
+ return -1;
+ }
+
+ if (FD_ISSET (fd, &ml->rset) ||
+ FD_ISSET (fd, &ml->wset) ||
+ FD_ISSET (fd, &ml->xset)) {
+ error (g, _("fd %d is already registered"), fd);
+ return -1;
+ }
+
+ if (cb == NULL) {
+ error (g, _("callback is NULL"));
+ return -1;
+ }
+
+ if ((events & GUESTFS_HANDLE_READABLE))
+ FD_SET (fd, &ml->rset);
+ if ((events & GUESTFS_HANDLE_WRITABLE))
+ FD_SET (fd, &ml->wset);
+ if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
+ FD_SET (fd, &ml->xset);
+
+ if (fd > ml->max_fd) {
+ ml->max_fd = fd;
+ ml->handle_cb_data =
+ safe_realloc (g, ml->handle_cb_data,
+ sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
+ }
+ ml->handle_cb_data[fd].cb = cb;
+ ml->handle_cb_data[fd].g = g;
+ ml->handle_cb_data[fd].data = data;
+
+ ml->nr_fds++;
+
+ /* Any integer >= 0 can be the handle, and this is as good as any ... */
+ return fd;
+}
+
+static int
+select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
+{
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
+
+ if (fd < 0 || fd >= FD_SETSIZE) {
+ error (g, _("fd %d is out of range"), fd);
+ return -1;
+ }
+
+ if (!FD_ISSET (fd, &ml->rset) &&
+ !FD_ISSET (fd, &ml->wset) &&
+ !FD_ISSET (fd, &ml->xset)) {
+ error (g, _("fd %d was not registered"), fd);
+ return -1;
+ }
+
+ FD_CLR (fd, &ml->rset);
+ FD_CLR (fd, &ml->wset);
+ FD_CLR (fd, &ml->xset);
+
+ if (fd == ml->max_fd) {
+ ml->max_fd--;
+ ml->handle_cb_data =
+ safe_realloc (g, ml->handle_cb_data,
+ sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
+ }
+
+ ml->nr_fds--;
+
+ return 0;
+}
+
+static int
+select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
+ guestfs_handle_timeout_cb cb, void *data)
+{
+ //struct select_main_loop *ml = (struct select_main_loop *) mlv;
+
+ abort (); /* XXX not implemented yet */
+}
+
+static int
+select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
+{
+ //struct select_main_loop *ml = (struct select_main_loop *) mlv;
+
+ abort (); /* XXX not implemented yet */
+}
+
+/* The 'g' parameter is just used for error reporting. Events
+ * for multiple handles can be dispatched by running the main
+ * loop.
+ */
+static int
+select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
+{
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
+ int fd, r, events;
+ fd_set rset2, wset2, xset2;
+
+ if (ml->is_running) {
+ error (g, _("select_main_loop_run: this cannot be called recursively"));
+ return -1;
+ }
+
+ ml->is_running = 1;
+
+ while (ml->is_running) {
+ if (ml->nr_fds == 0)
+ break;
+
+ rset2 = ml->rset;
+ wset2 = ml->wset;
+ xset2 = ml->xset;
+ r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "select");
+ ml->is_running = 0;
+ return -1;
+ }
+
+ for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
+ events = 0;
+ if (FD_ISSET (fd, &rset2))
+ events |= GUESTFS_HANDLE_READABLE;
+ if (FD_ISSET (fd, &wset2))
+ events |= GUESTFS_HANDLE_WRITABLE;
+ if (FD_ISSET (fd, &xset2))
+ events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
+ if (events) {
+ r--;
+ ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
+ ml->handle_cb_data[fd].g,
+ ml->handle_cb_data[fd].data,
+ fd, fd, events);
+ }
+ }
+ }
+
+ ml->is_running = 0;
+ return 0;
+}
+
+static int
+select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
+{
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
+
+ /* Note that legitimately ml->is_running can be zero when
+ * this function is called.
+ */
+ ml->is_running = 0;
return 0;
}
git.annexia.org / libguestfs.git / blobdiff