#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>
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. */
int stdout_watch; /* Watches qemu stdout for log messages. */
int verbose;
int autosync;
- const char *path;
- const char *qemu;
+ char *path; /* Path to kernel, initrd. */
+ char *qemu; /* Qemu binary. */
+ char *append; /* Append to kernel command line. */
char *last_error;
g->verbose = str != NULL && strcmp (str, "1") == 0;
str = getenv ("LIBGUESTFS_PATH");
- g->path = str != NULL ? str : GUESTFS_DEFAULT_PATH;
+ g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
+ if (!g->path) goto error;
str = getenv ("LIBGUESTFS_QEMU");
- g->qemu = str != NULL ? str : QEMU;
+ g->qemu = str != NULL ? strdup (str) : strdup (QEMU);
+ if (!g->qemu) goto error;
+
+ str = getenv ("LIBGUESTFS_APPEND");
+ if (str) {
+ g->append = strdup (str);
+ if (!g->append) goto error;
+ }
g->main_loop = guestfs_get_default_main_loop ();
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
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)
+ if (g->autosync && g->state == READY) {
+ guestfs_umount_all (g);
guestfs_sync (g);
+ }
/* Remove any handlers that might be called back before we kill the
* subprocess.
}
/* 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);
}
while (len > 0) {
r = read (fd, buf, len);
- if (r == -1)
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
return -1;
+ }
buf += r;
len -= r;
int
guestfs_set_path (guestfs_h *g, const char *path)
{
- if (path == NULL)
- g->path = GUESTFS_DEFAULT_PATH;
- else
- g->path = path;
+ free (g->path);
+ g->path = NULL;
+
+ g->path =
+ path == NULL ?
+ safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
return 0;
}
int
guestfs_set_qemu (guestfs_h *g, const char *qemu)
{
- if (qemu == NULL)
- g->qemu = QEMU;
- else
- g->qemu = qemu;
+ free (g->qemu);
+ g->qemu = NULL;
+
+ g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
return 0;
}
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)
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) {
guestfs_launch (guestfs_h *g)
{
static const char *dir_template = "/tmp/libguestfsXXXXXX";
- int r, i, len, pmore;
+ int r, i, pmore, memsize;
+ size_t len;
int wfd[2], rfd[2];
int tries;
const char *kernel_name = "vmlinuz." REPO "." host_cpu;
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 socket. */
if (!g->tmpdir) {
g->tmpdir = safe_strdup (g, dir_template);
if (r == 0) { /* Child (qemu). */
char vmchannel[256];
char append[256];
+ char memsize_str[256];
/* 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 *) g->qemu;
+ g->cmdline[0] = g->qemu;
/* Construct the -net channel parameter for qemu. */
snprintf (vmchannel, sizeof vmchannel,
/* Linux kernel command line. */
snprintf (append, sizeof append,
- "console=ttyS0 guestfs=%s:%d%s",
+ "panic=1 console=ttyS0 guestfs=%s:%d%s%s%s",
VMCHANNEL_ADDR, VMCHANNEL_PORT,
- g->verbose ? " guestfs_verbose=1" : "");
+ 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, "384"); /* XXX Choose best size. */
+ 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, "-net");
add_cmdline (g, "user,vlan=0");
add_cmdline (g, "-net");
- add_cmdline (g, "nic,model=rtl8139,vlan=0");
+ add_cmdline (g, "nic,model=virtio,vlan=0");
incr_cmdline_size (g);
g->cmdline[g->cmdline_size-1] = NULL;
/* 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);
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) {
- /* Always sleep at least once to give qemu a small chance to start up. */
- usleep (10000);
-
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");
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;
fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
kill (g->pid, SIGTERM);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
return 0;
}
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.
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.
n = read (fd, buf, sizeof buf);
if (n == 0) {
/* Hopefully this indicates the qemu child process has died. */
- if (g->verbose)
- fprintf (stderr, "stdout_event: %p: child process died\n", g);
- /*kill (g->pid, SIGTERM);*/
- waitpid (g->pid, 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->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);
+ child_cleanup (g);
return;
}
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
int watch, int fd, int events)
{
XDR xdr;
- unsigned len;
+ u_int32_t len;
int n;
if (g->verbose)
}
n = read (g->sock, g->msg_in + g->msg_in_size,
g->msg_in_allocated - g->msg_in_size);
- if (n == 0)
- /* Disconnected? Ignore it because stdout_watch will get called
- * and will do the cleanup.
- */
+ if (n == 0) {
+ /* Disconnected. */
+ child_cleanup (g);
return;
+ }
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
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;
printf ("|\n");
}
}
+#endif
/* Not in the expected state. */
if (g->state != BUSY)
/* 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);
guestfs__send_sync (guestfs_h *g, int proc_nr,
xdrproc_t xdrp, char *args)
{
- char buffer[GUESTFS_MESSAGE_MAX];
struct guestfs_message_header hdr;
XDR xdr;
- unsigned len;
+ u_int32_t len;
int serial = g->msg_next_serial++;
int sent;
guestfs_main_loop *ml = guestfs_get_main_loop (g);
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.serial = serial;
hdr.status = GUESTFS_STATUS_OK;
- xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
error (g, "xdr_guestfs_message_header failed");
- return -1;
+ goto cleanup1;
}
/* Serialize the args. If any, because some message types
if (xdrp) {
if (!(*xdrp) (&xdr, args)) {
error (g, "dispatch failed to marshal args");
- return -1;
+ 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);
- /* Allocate the outgoing message buffer. */
- g->msg_out = safe_malloc (g, len + 4);
-
+ 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);
- memcpy (g->msg_out + 4, buffer, len);
-
if (guestfs__switch_to_sending (g) == -1)
goto cleanup1;
}
/* Send file in chunked encoding. */
- while (!cancel && (r = read (fd, buf, sizeof buf)) > 0) {
+ 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 */
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 len)
+send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
{
- char data[GUESTFS_MAX_CHUNK_SIZE + 48];
- unsigned datalen;
+ u_int32_t len;
int sent;
guestfs_chunk chunk;
XDR xdr;
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)
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 = len;
+ chunk.data.data_len = buflen;
chunk.data.data_val = (char *) buf;
- if (g->verbose)
- fprintf (stderr,
- "library sending chunk cancel = %d, len = %zu, buf = %p\n",
- cancel, len, buf);
-
- xdrmem_create (&xdr, data, sizeof data, XDR_ENCODE);
if (!xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, "xdr_guestfs_chunk failed (buf = %p, len = %zu)", buf, len);
+ error (g, "xdr_guestfs_chunk failed (buf = %p, buflen = %zu)",
+ buf, buflen);
xdr_destroy (&xdr);
- return -1;
+ goto cleanup1;
}
- datalen = xdr_getpos (&xdr);
+ len = xdr_getpos (&xdr);
xdr_destroy (&xdr);
- /* Allocate outgoing message buffer. */
- g->msg_out = safe_malloc (g, datalen + 4);
- g->msg_out_size = datalen + 4;
+ /* 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, &datalen);
-
- memcpy (g->msg_out + 4, data, datalen);
+ xdr_uint32_t (&xdr, &len);
if (guestfs__switch_to_sending (g) == -1)
goto cleanup1;
/* Synchronously receive a file. */
-static int receive_file_data_sync (guestfs_h *g, void **buf);
+/* 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) {
}
/* Receive the file in chunked encoding. */
- while ((r = receive_file_data_sync (g, &buf)) > 0) {
- if (xwrite (fd, buf, r) == -1) {
+ 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) {
return -1;
}
- while ((r = receive_file_data_sync (g, &buf)) > 0)
- free (buf); /* just discard it */
+ 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 code;
- void **buf;
+ 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");
- ctx->code = -1;
- return;
- }
- if (chunk.cancel) {
- error (g, "file receive cancelled by daemon");
- ctx->code = -2;
- return;
- }
- if (chunk.data.data_len == 0) { /* end of transfer */
- ctx->code = 0;
+ free_chunks (ctx);
+ ctx->chunks = NULL;
+ ctx->count = -1;
return;
}
- ctx->code = chunk.data.data_len;
- *ctx->buf = chunk.data.data_val; /* caller frees */
+ /* 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)
+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.code = -3;
- ctx.buf = buf;
+ 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 (g->verbose)
- fprintf (stderr, "receive_file_data_sync: code %d\n", ctx.code);
-
- switch (ctx.code) {
- case 0: /* end of file */
- return 0;
- case -1: case -2:
+ if (ctx.count == 0) {
+ error (g, "receive_file_data_sync: reply callback not called\n");
return -1;
- case -3:
- error (g, "failed to call receive_file_cb");
+ }
+
+ if (ctx.count == -1) {
+ error (g, "receive_file_data_sync: parse error in reply callback\n");
+ /* callback already freed the chunks */
return -1;
- default: /* received n bytes of data */
- return ctx.code;
}
+
+ 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). */
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;
git.annexia.org / libguestfs.git / blobdiff