2 * Copyright (C) 2009 Red Hat Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #define _BSD_SOURCE /* for mkdtemp, usleep */
22 #define _GNU_SOURCE /* for vasprintf, GNU strerror_r, strchrnul */
33 #include <sys/select.h>
35 #include <rpc/types.h>
42 #ifdef HAVE_SYS_TYPES_H
43 #include <sys/types.h>
46 #ifdef HAVE_SYS_WAIT_H
50 #ifdef HAVE_SYS_SOCKET_H
51 #include <sys/socket.h>
59 #include "guestfs_protocol.h"
61 #define error guestfs_error
62 #define perrorf guestfs_perrorf
63 #define safe_malloc guestfs_safe_malloc
64 #define safe_realloc guestfs_safe_realloc
65 #define safe_strdup guestfs_safe_strdup
66 #define safe_memdup guestfs_safe_memdup
68 static void default_error_cb (guestfs_h *g, void *data, const char *msg);
69 static void stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
70 static void sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
71 static void sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
73 static void close_handles (void);
75 static int select_add_handle (guestfs_main_loop *ml, guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
76 static int select_remove_handle (guestfs_main_loop *ml, guestfs_h *g, int watch);
77 static int select_add_timeout (guestfs_main_loop *ml, guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
78 static int select_remove_timeout (guestfs_main_loop *ml, guestfs_h *g, int timer);
79 static int select_main_loop_run (guestfs_main_loop *ml, guestfs_h *g);
80 static int select_main_loop_quit (guestfs_main_loop *ml, guestfs_h *g);
82 /* Default select-based main loop. */
83 struct select_handle_cb_data {
84 guestfs_handle_event_cb cb;
89 struct select_main_loop {
90 /* NB. These fields must be the same as in struct guestfs_main_loop: */
91 guestfs_add_handle_cb add_handle;
92 guestfs_remove_handle_cb remove_handle;
93 guestfs_add_timeout_cb add_timeout;
94 guestfs_remove_timeout_cb remove_timeout;
95 guestfs_main_loop_run_cb main_loop_run;
96 guestfs_main_loop_quit_cb main_loop_quit;
98 /* Additional private data: */
107 struct select_handle_cb_data *handle_cb_data;
110 /* Default main loop. */
111 static struct select_main_loop default_main_loop = {
112 .add_handle = select_add_handle,
113 .remove_handle = select_remove_handle,
114 .add_timeout = select_add_timeout,
115 .remove_timeout = select_remove_timeout,
116 .main_loop_run = select_main_loop_run,
117 .main_loop_quit = select_main_loop_quit,
119 /* XXX hopefully .rset, .wset, .xset are initialized to the empty
120 * set by the normal action of everything being initialized to zero.
125 .handle_cb_data = NULL,
128 #define UNIX_PATH_MAX 108
130 /* Also in guestfsd.c */
131 #define VMCHANNEL_PORT 6666
132 #define VMCHANNEL_ADDR "10.0.2.4"
134 /* GuestFS handle and connection. */
135 enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
139 struct guestfs_h *next; /* Linked list of open handles. */
141 /* State: see the state machine diagram in the man page guestfs(3). */
144 int fd[2]; /* Stdin/stdout of qemu. */
145 int sock; /* Daemon communications socket. */
146 pid_t pid; /* Qemu PID. */
147 pid_t recoverypid; /* Recovery process PID. */
148 time_t start_t; /* The time when we started qemu. */
150 int stdout_watch; /* Watches qemu stdout for log messages. */
151 int sock_watch; /* Watches daemon comm socket. */
153 char *tmpdir; /* Temporary directory containing socket. */
155 char **cmdline; /* Qemu command line. */
161 char *path; /* Path to kernel, initrd. */
162 char *qemu; /* Qemu binary. */
163 char *append; /* Append to kernel command line. */
168 guestfs_abort_cb abort_cb;
169 guestfs_error_handler_cb error_cb;
170 void * error_cb_data;
171 guestfs_send_cb send_cb;
173 guestfs_reply_cb reply_cb;
174 void * reply_cb_data;
175 guestfs_log_message_cb log_message_cb;
176 void * log_message_cb_data;
177 guestfs_subprocess_quit_cb subprocess_quit_cb;
178 void * subprocess_quit_cb_data;
179 guestfs_launch_done_cb launch_done_cb;
180 void * launch_done_cb_data;
182 /* Main loop used by this handle. */
183 guestfs_main_loop *main_loop;
185 /* Messages sent and received from the daemon. */
187 int msg_in_size, msg_in_allocated;
189 int msg_out_size, msg_out_pos;
194 static guestfs_h *handles = NULL;
195 static int atexit_handler_set = 0;
198 guestfs_create (void)
203 g = malloc (sizeof (*g));
206 memset (g, 0, sizeof (*g));
213 g->stdout_watch = -1;
217 g->error_cb = default_error_cb;
218 g->error_cb_data = NULL;
220 str = getenv ("LIBGUESTFS_DEBUG");
221 g->verbose = str != NULL && strcmp (str, "1") == 0;
223 str = getenv ("LIBGUESTFS_PATH");
224 g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
225 if (!g->path) goto error;
227 str = getenv ("LIBGUESTFS_QEMU");
228 g->qemu = str != NULL ? strdup (str) : strdup (QEMU);
229 if (!g->qemu) goto error;
231 str = getenv ("LIBGUESTFS_APPEND");
233 g->append = strdup (str);
234 if (!g->append) goto error;
237 g->main_loop = guestfs_get_default_main_loop ();
239 /* Start with large serial numbers so they are easy to spot
240 * inside the protocol.
242 g->msg_next_serial = 0x00123400;
244 /* Link the handles onto a global list. This is the one area
245 * where the library needs to be made thread-safe. (XXX)
247 /* acquire mutex (XXX) */
250 if (!atexit_handler_set) {
251 atexit (close_handles);
252 atexit_handler_set = 1;
254 /* release mutex (XXX) */
257 fprintf (stderr, "new guestfs handle %p\n", g);
270 guestfs_close (guestfs_h *g)
276 if (g->state == NO_HANDLE) {
277 /* Not safe to call 'error' here, so ... */
278 fprintf (stderr, "guestfs_close: called twice on the same handle\n");
283 fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
285 /* Try to sync if autosync flag is set. */
286 if (g->autosync && g->state == READY) {
287 guestfs_umount_all (g);
291 /* Remove any handlers that might be called back before we kill the
294 g->log_message_cb = NULL;
296 if (g->state != CONFIG)
297 guestfs_kill_subprocess (g);
300 snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
309 for (i = 0; i < g->cmdline_size; ++i)
310 free (g->cmdline[i]);
314 /* Mark the handle as dead before freeing it. */
315 g->state = NO_HANDLE;
317 /* acquire mutex (XXX) */
321 for (gg = handles; gg->next != g; gg = gg->next)
325 /* release mutex (XXX) */
329 free (g->last_error);
336 /* Close all open handles (called from atexit(3)). */
340 while (handles) guestfs_close (handles);
344 guestfs_last_error (guestfs_h *g)
346 return g->last_error;
350 set_last_error (guestfs_h *g, const char *msg)
352 free (g->last_error);
353 g->last_error = strdup (msg);
357 default_error_cb (guestfs_h *g, void *data, const char *msg)
359 fprintf (stderr, "libguestfs: error: %s\n", msg);
363 guestfs_error (guestfs_h *g, const char *fs, ...)
369 vasprintf (&msg, fs, args);
372 if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
373 set_last_error (g, msg);
379 guestfs_perrorf (guestfs_h *g, const char *fs, ...)
386 vasprintf (&msg, fs, args);
391 strerror_r (err, buf, sizeof buf);
395 buf = strerror_r (err, _buf, sizeof _buf);
398 msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
402 if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
403 set_last_error (g, msg);
409 guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
411 void *ptr = malloc (nbytes);
412 if (!ptr) g->abort_cb ();
417 guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
419 void *p = realloc (ptr, nbytes);
420 if (!p) g->abort_cb ();
425 guestfs_safe_strdup (guestfs_h *g, const char *str)
427 char *s = strdup (str);
428 if (!s) g->abort_cb ();
433 guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
435 void *p = malloc (size);
436 if (!p) g->abort_cb ();
437 memcpy (p, ptr, size);
442 xwrite (int fd, const void *buf, size_t len)
447 r = write (fd, buf, len);
459 xread (int fd, void *buf, size_t len)
464 r = read (fd, buf, len);
466 if (errno == EINTR || errno == EAGAIN)
479 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
485 guestfs_get_out_of_memory_handler (guestfs_h *g)
491 guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
494 g->error_cb_data = data;
497 guestfs_error_handler_cb
498 guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
500 if (data_rtn) *data_rtn = g->error_cb_data;
505 guestfs_set_verbose (guestfs_h *g, int v)
512 guestfs_get_verbose (guestfs_h *g)
518 guestfs_set_autosync (guestfs_h *g, int a)
525 guestfs_get_autosync (guestfs_h *g)
531 guestfs_set_path (guestfs_h *g, const char *path)
538 safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
543 guestfs_get_path (guestfs_h *g)
549 guestfs_set_qemu (guestfs_h *g, const char *qemu)
554 g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
559 guestfs_get_qemu (guestfs_h *g)
565 guestfs_set_append (guestfs_h *g, const char *append)
570 g->append = append ? safe_strdup (g, append) : NULL;
575 guestfs_get_append (guestfs_h *g)
580 /* Add a string to the current command line. */
582 incr_cmdline_size (guestfs_h *g)
584 if (g->cmdline == NULL) {
585 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
587 g->cmdline = safe_malloc (g, sizeof (char *));
588 g->cmdline[0] = NULL;
592 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
596 add_cmdline (guestfs_h *g, const char *str)
598 if (g->state != CONFIG) {
599 error (g, "command line cannot be altered after qemu subprocess launched");
603 incr_cmdline_size (g);
604 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
609 guestfs_config (guestfs_h *g,
610 const char *qemu_param, const char *qemu_value)
612 if (qemu_param[0] != '-') {
613 error (g, "guestfs_config: parameter must begin with '-' character");
617 /* A bit fascist, but the user will probably break the extra
618 * parameters that we add if they try to set any of these.
620 if (strcmp (qemu_param, "-kernel") == 0 ||
621 strcmp (qemu_param, "-initrd") == 0 ||
622 strcmp (qemu_param, "-nographic") == 0 ||
623 strcmp (qemu_param, "-serial") == 0 ||
624 strcmp (qemu_param, "-vnc") == 0 ||
625 strcmp (qemu_param, "-full-screen") == 0 ||
626 strcmp (qemu_param, "-std-vga") == 0 ||
627 strcmp (qemu_param, "-vnc") == 0) {
628 error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
632 if (add_cmdline (g, qemu_param) != 0) return -1;
634 if (qemu_value != NULL) {
635 if (add_cmdline (g, qemu_value) != 0) return -1;
642 guestfs_add_drive (guestfs_h *g, const char *filename)
644 size_t len = strlen (filename) + 64;
647 if (strchr (filename, ',') != NULL) {
648 error (g, "filename cannot contain ',' (comma) character");
652 if (access (filename, F_OK) == -1) {
653 perrorf (g, "%s", filename);
657 snprintf (buf, len, "file=%s", filename);
659 return guestfs_config (g, "-drive", buf);
663 guestfs_add_cdrom (guestfs_h *g, const char *filename)
665 if (strchr (filename, ',') != NULL) {
666 error (g, "filename cannot contain ',' (comma) character");
670 if (access (filename, F_OK) == -1) {
671 perrorf (g, "%s", filename);
675 return guestfs_config (g, "-cdrom", filename);
679 guestfs_launch (guestfs_h *g)
681 static const char *dir_template = "/tmp/libguestfsXXXXXX";
682 int r, i, pmore, memsize;
686 const char *kernel_name = "vmlinuz." REPO "." host_cpu;
687 const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
688 char *path, *pelem, *pend;
689 char *kernel = NULL, *initrd = NULL;
691 struct sockaddr_un addr;
695 error (g, "you must call guestfs_add_drive before guestfs_launch");
699 if (g->state != CONFIG) {
700 error (g, "qemu has already been launched");
704 /* Search g->path for the kernel and initrd. */
705 pelem = path = safe_strdup (g, g->path);
707 pend = strchrnul (pelem, ':');
708 pmore = *pend == ':';
712 /* Empty element or "." means cwd. */
713 if (len == 0 || (len == 1 && *pelem == '.')) {
716 "looking for kernel and initrd in current directory\n");
717 if (access (kernel_name, F_OK) == 0 && access (initrd_name, F_OK) == 0) {
718 kernel = safe_strdup (g, kernel_name);
719 initrd = safe_strdup (g, initrd_name);
723 /* Look at <path>/kernel etc. */
725 kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
726 initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
727 sprintf (kernel, "%s/%s", pelem, kernel_name);
728 sprintf (initrd, "%s/%s", pelem, initrd_name);
731 fprintf (stderr, "looking for %s and %s\n", kernel, initrd);
733 if (access (kernel, F_OK) == 0 && access (initrd, F_OK) == 0)
737 kernel = initrd = NULL;
745 if (kernel == NULL || initrd == NULL) {
746 error (g, "cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)",
747 kernel_name, initrd_name, g->path);
751 /* Choose a suitable memory size. Previously we tried to choose
752 * a minimal memory size, but this isn't really necessary since
753 * recent QEMU and KVM don't do anything nasty like locking
754 * memory into core any more. This we can safely choose a
755 * large, generous amount of memory, and it'll just get swapped
756 * on smaller systems.
760 /* Make the temporary directory containing the socket. */
762 g->tmpdir = safe_strdup (g, dir_template);
763 if (mkdtemp (g->tmpdir) == NULL) {
764 perrorf (g, "%s: cannot create temporary directory", dir_template);
769 snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
772 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
787 if (r == 0) { /* Child (qemu). */
790 char memsize_str[256];
792 /* Set up the full command line. Do this in the subprocess so we
793 * don't need to worry about cleaning up.
795 g->cmdline[0] = g->qemu;
797 /* Construct the -net channel parameter for qemu. */
798 snprintf (vmchannel, sizeof vmchannel,
799 "channel,%d:unix:%s,server,nowait",
800 VMCHANNEL_PORT, unixsock);
802 /* Linux kernel command line. */
803 snprintf (append, sizeof append,
804 "panic=1 console=ttyS0 guestfs=%s:%d%s%s%s",
805 VMCHANNEL_ADDR, VMCHANNEL_PORT,
806 g->verbose ? " guestfs_verbose=1" : "",
807 g->append ? " " : "", g->append ? g->append : "");
809 snprintf (memsize_str, sizeof memsize_str, "%d", memsize);
811 add_cmdline (g, "-m");
812 add_cmdline (g, memsize_str);
814 add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
816 add_cmdline (g, "-no-reboot"); /* Force exit instead of reboot on panic */
817 add_cmdline (g, "-kernel");
818 add_cmdline (g, (char *) kernel);
819 add_cmdline (g, "-initrd");
820 add_cmdline (g, (char *) initrd);
821 add_cmdline (g, "-append");
822 add_cmdline (g, append);
823 add_cmdline (g, "-nographic");
824 add_cmdline (g, "-serial");
825 add_cmdline (g, "stdio");
826 add_cmdline (g, "-net");
827 add_cmdline (g, vmchannel);
828 add_cmdline (g, "-net");
829 add_cmdline (g, "user,vlan=0");
830 add_cmdline (g, "-net");
831 add_cmdline (g, "nic,model=virtio,vlan=0");
832 incr_cmdline_size (g);
833 g->cmdline[g->cmdline_size-1] = NULL;
836 fprintf (stderr, "%s", g->qemu);
837 for (i = 0; g->cmdline[i]; ++i)
838 fprintf (stderr, " %s", g->cmdline[i]);
839 fprintf (stderr, "\n");
842 /* Set up stdin, stdout. */
853 /* Set up a new process group, so we can signal this process
854 * and all subprocesses (eg. if qemu is really a shell script).
859 execv (g->qemu, g->cmdline); /* Run qemu. */
864 /* Parent (library). */
872 /* Fork the recovery process off which will kill qemu if the parent
873 * process fails to do so (eg. if the parent segfaults).
877 pid_t qemu_pid = g->pid;
878 pid_t parent_pid = getppid ();
880 /* Writing to argv is hideously complicated and error prone. See:
881 * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
884 /* Loop around waiting for one or both of the other processes to
885 * disappear. It's fair to say this is very hairy. The PIDs that
886 * we are looking at might be reused by another process. We are
887 * effectively polling. Is the cure worse than the disease?
890 if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
892 if (kill (parent_pid, 0) == -1) {
893 /* Parent's gone away, qemu still around, so kill qemu. */
901 /* Don't worry, if the fork failed, this will be -1. The recovery
902 * process isn't essential.
906 /* Start the clock ... */
909 /* Close the other ends of the pipe. */
913 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
914 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
915 perrorf (g, "fcntl");
919 g->fd[0] = wfd[1]; /* stdin of child */
920 g->fd[1] = rfd[0]; /* stdout of child */
922 /* Open the Unix socket. The vmchannel implementation that got
923 * merged with qemu sucks in a number of ways. Both ends do
924 * connect(2), which means that no one knows what, if anything, is
925 * connected to the other end, or if it becomes disconnected. Even
926 * worse, we have to wait some indeterminate time for qemu to create
927 * the socket and connect to it (which happens very early in qemu's
928 * start-up), so any code that uses vmchannel is inherently racy.
929 * Hence this silly loop.
931 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
933 perrorf (g, "socket");
937 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
938 perrorf (g, "fcntl");
942 addr.sun_family = AF_UNIX;
943 strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
944 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
947 /* Always sleep at least once to give qemu a small chance to start up. */
950 r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
951 if ((r == -1 && errno == EINPROGRESS) || r == 0)
955 perrorf (g, "connect");
960 error (g, "failed to connect to vmchannel socket");
964 /* Watch the file descriptors. */
967 g->msg_in_size = g->msg_in_allocated = 0;
975 g->main_loop->add_handle (g->main_loop, g, g->fd[1],
976 GUESTFS_HANDLE_READABLE,
978 if (g->stdout_watch == -1) {
979 error (g, "could not watch qemu stdout");
983 if (guestfs__switch_to_receiving (g) == -1)
986 g->state = LAUNCHING;
990 if (g->stdout_watch >= 0)
991 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
992 if (g->sock_watch >= 0)
993 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
1002 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1003 waitpid (g->pid, NULL, 0);
1004 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
1011 g->stdout_watch = -1;
1021 finish_wait_ready (guestfs_h *g, void *vp)
1024 fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
1027 g->main_loop->main_loop_quit (g->main_loop, g);
1031 guestfs_wait_ready (guestfs_h *g)
1033 int finished = 0, r;
1035 if (g->state == READY) return 0;
1037 if (g->state == BUSY) {
1038 error (g, "qemu has finished launching already");
1042 if (g->state != LAUNCHING) {
1043 error (g, "qemu has not been launched yet");
1047 g->launch_done_cb = finish_wait_ready;
1048 g->launch_done_cb_data = &finished;
1049 r = g->main_loop->main_loop_run (g->main_loop, g);
1050 g->launch_done_cb = NULL;
1051 g->launch_done_cb_data = NULL;
1053 if (r == -1) return -1;
1055 if (finished != 1) {
1056 error (g, "guestfs_wait_ready failed, see earlier error messages");
1060 /* This is possible in some really strange situations, such as
1061 * guestfsd starts up OK but then qemu immediately exits. Check for
1062 * it because the caller is probably expecting to be able to send
1063 * commands after this function returns.
1065 if (g->state != READY) {
1066 error (g, "qemu launched and contacted daemon, but state != READY");
1074 guestfs_kill_subprocess (guestfs_h *g)
1076 if (g->state == CONFIG) {
1077 error (g, "no subprocess to kill");
1082 fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
1084 kill (g->pid, SIGTERM);
1085 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1090 /* Access current state. */
1092 guestfs_is_config (guestfs_h *g)
1094 return g->state == CONFIG;
1098 guestfs_is_launching (guestfs_h *g)
1100 return g->state == LAUNCHING;
1104 guestfs_is_ready (guestfs_h *g)
1106 return g->state == READY;
1110 guestfs_is_busy (guestfs_h *g)
1112 return g->state == BUSY;
1116 guestfs_get_state (guestfs_h *g)
1122 guestfs_set_ready (guestfs_h *g)
1124 if (g->state != BUSY) {
1125 error (g, "guestfs_set_ready: called when in state %d != BUSY", g->state);
1133 guestfs_set_busy (guestfs_h *g)
1135 if (g->state != READY) {
1136 error (g, "guestfs_set_busy: called when in state %d != READY", g->state);
1144 guestfs_end_busy (guestfs_h *g)
1156 error (g, "guestfs_end_busy: called when in state %d", g->state);
1162 /* Structure-freeing functions. These rely on the fact that the
1163 * structure format is identical to the XDR format. See note in
1167 guestfs_free_int_bool (struct guestfs_int_bool *x)
1173 guestfs_free_lvm_pv_list (struct guestfs_lvm_pv_list *x)
1175 xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_pv_list, (char *) x);
1180 guestfs_free_lvm_vg_list (struct guestfs_lvm_vg_list *x)
1182 xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_vg_list, (char *) x);
1187 guestfs_free_lvm_lv_list (struct guestfs_lvm_lv_list *x)
1189 xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_lv_list, (char *) x);
1193 /* We don't know if stdout_event or sock_read_event will be the
1194 * first to receive EOF if the qemu process dies. This function
1195 * has the common cleanup code for both.
1198 child_cleanup (guestfs_h *g)
1201 fprintf (stderr, "stdout_event: %p: child process died\n", g);
1202 /*kill (g->pid, SIGTERM);*/
1203 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1204 waitpid (g->pid, NULL, 0);
1205 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
1206 if (g->stdout_watch >= 0)
1207 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
1208 if (g->sock_watch >= 0)
1209 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
1219 g->stdout_watch = -1;
1222 if (g->subprocess_quit_cb)
1223 g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
1226 /* This function is called whenever qemu prints something on stdout.
1227 * Qemu's stdout is also connected to the guest's serial console, so
1228 * we see kernel messages here too.
1231 stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1232 int watch, int fd, int events)
1240 "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1241 g, g->state, fd, events);
1244 if (g->fd[1] != fd) {
1245 error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
1249 n = read (fd, buf, sizeof buf);
1251 /* Hopefully this indicates the qemu child process has died. */
1257 if (errno != EINTR && errno != EAGAIN)
1258 perrorf (g, "read");
1262 /* In verbose mode, copy all log messages to stderr. */
1266 /* It's an actual log message, send it upwards if anyone is listening. */
1267 if (g->log_message_cb)
1268 g->log_message_cb (g, g->log_message_cb_data, buf, n);
1271 /* The function is called whenever we can read something on the
1272 * guestfsd (daemon inside the guest) communication socket.
1275 sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1276 int watch, int fd, int events)
1284 "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1285 g, g->state, fd, events);
1287 if (g->sock != fd) {
1288 error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
1292 if (g->msg_in_size <= g->msg_in_allocated) {
1293 g->msg_in_allocated += 4096;
1294 g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
1296 n = read (g->sock, g->msg_in + g->msg_in_size,
1297 g->msg_in_allocated - g->msg_in_size);
1305 if (errno != EINTR && errno != EAGAIN)
1306 perrorf (g, "read");
1310 g->msg_in_size += n;
1312 /* Have we got enough of a message to be able to process it yet? */
1314 if (g->msg_in_size < 4) return;
1316 xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
1317 if (!xdr_uint32_t (&xdr, &len)) {
1318 error (g, "can't decode length word");
1322 /* Length is normally the length of the message, but when guestfsd
1323 * starts up it sends a "magic" value (longer than any possible
1324 * message). Check for this.
1326 if (len == GUESTFS_LAUNCH_FLAG) {
1327 if (g->state != LAUNCHING)
1328 error (g, "received magic signature from guestfsd, but in state %d",
1330 else if (g->msg_in_size != 4)
1331 error (g, "received magic signature from guestfsd, but msg size is %d",
1335 if (g->launch_done_cb)
1336 g->launch_done_cb (g, g->launch_done_cb_data);
1342 /* This can happen if a cancellation happens right at the end
1343 * of us sending a FileIn parameter to the daemon. Discard. The
1344 * daemon should send us an error message next.
1346 if (len == GUESTFS_CANCEL_FLAG) {
1347 g->msg_in_size -= 4;
1348 memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
1352 /* If this happens, it's pretty bad and we've probably lost
1355 if (len > GUESTFS_MESSAGE_MAX) {
1356 error (g, "message length (%u) > maximum possible size (%d)",
1357 len, GUESTFS_MESSAGE_MAX);
1361 if (g->msg_in_size-4 < len) return; /* Need more of this message. */
1363 /* Got the full message, begin processing it. */
1368 for (i = 0; i < g->msg_in_size; i += 16) {
1369 printf ("%04x: ", i);
1370 for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
1371 printf ("%02x ", (unsigned char) g->msg_in[j]);
1372 for (; j < i+16; ++j)
1375 for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
1376 if (isprint (g->msg_in[j]))
1377 printf ("%c", g->msg_in[j]);
1380 for (; j < i+16; ++j)
1387 /* Not in the expected state. */
1388 if (g->state != BUSY)
1389 error (g, "state %d != BUSY", g->state);
1391 /* Push the message up to the higher layer. */
1393 g->reply_cb (g, g->reply_cb_data, &xdr);
1395 /* This message (probably) should never be printed. */
1396 fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
1398 g->msg_in_size -= len + 4;
1399 memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
1400 if (g->msg_in_size > 0) goto again;
1403 /* Free the message buffer if it's grown excessively large. */
1404 if (g->msg_in_allocated > 65536) {
1407 g->msg_in_size = g->msg_in_allocated = 0;
1414 /* The function is called whenever we can write something on the
1415 * guestfsd (daemon inside the guest) communication socket.
1418 sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1419 int watch, int fd, int events)
1425 "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1426 g, g->state, fd, events);
1428 if (g->sock != fd) {
1429 error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
1433 if (g->state != BUSY) {
1434 error (g, "sock_write_event: state %d != BUSY", g->state);
1439 fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
1440 g->msg_out_size - g->msg_out_pos);
1442 n = write (g->sock, g->msg_out + g->msg_out_pos,
1443 g->msg_out_size - g->msg_out_pos);
1445 if (errno != EAGAIN)
1446 perrorf (g, "write");
1451 fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
1453 g->msg_out_pos += n;
1455 /* More to write? */
1456 if (g->msg_out_pos < g->msg_out_size)
1460 fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
1464 g->msg_out_pos = g->msg_out_size = 0;
1466 /* Done writing, call the higher layer. */
1468 g->send_cb (g, g->send_cb_data);
1472 guestfs_set_send_callback (guestfs_h *g,
1473 guestfs_send_cb cb, void *opaque)
1476 g->send_cb_data = opaque;
1480 guestfs_set_reply_callback (guestfs_h *g,
1481 guestfs_reply_cb cb, void *opaque)
1484 g->reply_cb_data = opaque;
1488 guestfs_set_log_message_callback (guestfs_h *g,
1489 guestfs_log_message_cb cb, void *opaque)
1491 g->log_message_cb = cb;
1492 g->log_message_cb_data = opaque;
1496 guestfs_set_subprocess_quit_callback (guestfs_h *g,
1497 guestfs_subprocess_quit_cb cb, void *opaque)
1499 g->subprocess_quit_cb = cb;
1500 g->subprocess_quit_cb_data = opaque;
1504 guestfs_set_launch_done_callback (guestfs_h *g,
1505 guestfs_launch_done_cb cb, void *opaque)
1507 g->launch_done_cb = cb;
1508 g->launch_done_cb_data = opaque;
1511 /* Access to the handle's main loop and the default main loop. */
1513 guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
1515 g->main_loop = main_loop;
1519 guestfs_get_main_loop (guestfs_h *g)
1521 return g->main_loop;
1525 guestfs_get_default_main_loop (void)
1527 return (guestfs_main_loop *) &default_main_loop;
1530 /* Change the daemon socket handler so that we are now writing.
1531 * This sets the handle to sock_write_event.
1534 guestfs__switch_to_sending (guestfs_h *g)
1536 if (g->sock_watch >= 0) {
1537 if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
1538 error (g, "remove_handle failed");
1545 g->main_loop->add_handle (g->main_loop, g, g->sock,
1546 GUESTFS_HANDLE_WRITABLE,
1547 sock_write_event, NULL);
1548 if (g->sock_watch == -1) {
1549 error (g, "add_handle failed");
1557 guestfs__switch_to_receiving (guestfs_h *g)
1559 if (g->sock_watch >= 0) {
1560 if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
1561 error (g, "remove_handle failed");
1568 g->main_loop->add_handle (g->main_loop, g, g->sock,
1569 GUESTFS_HANDLE_READABLE,
1570 sock_read_event, NULL);
1571 if (g->sock_watch == -1) {
1572 error (g, "add_handle failed");
1579 /* Dispatch a call (len + header + args) to the remote daemon,
1580 * synchronously (ie. using the guest's main loop to wait until
1581 * it has been sent). Returns -1 for error, or the serial
1582 * number of the message.
1585 send_cb (guestfs_h *g, void *data)
1587 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1590 ml->main_loop_quit (ml, g);
1594 guestfs__send_sync (guestfs_h *g, int proc_nr,
1595 xdrproc_t xdrp, char *args)
1597 struct guestfs_message_header hdr;
1600 int serial = g->msg_next_serial++;
1602 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1604 if (g->state != BUSY) {
1605 error (g, "guestfs__send_sync: state %d != BUSY", g->state);
1609 /* This is probably an internal error. Or perhaps we should just
1610 * free the buffer anyway?
1612 if (g->msg_out != NULL) {
1613 error (g, "guestfs__send_sync: msg_out should be NULL");
1617 /* We have to allocate this message buffer on the heap because
1618 * it is quite large (although will be mostly unused). We
1619 * can't allocate it on the stack because in some environments
1620 * we have quite limited stack space available, notably when
1621 * running in the JVM.
1623 g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
1624 xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
1626 /* Serialize the header. */
1627 hdr.prog = GUESTFS_PROGRAM;
1628 hdr.vers = GUESTFS_PROTOCOL_VERSION;
1630 hdr.direction = GUESTFS_DIRECTION_CALL;
1631 hdr.serial = serial;
1632 hdr.status = GUESTFS_STATUS_OK;
1634 if (!xdr_guestfs_message_header (&xdr, &hdr)) {
1635 error (g, "xdr_guestfs_message_header failed");
1639 /* Serialize the args. If any, because some message types
1640 * have no parameters.
1643 if (!(*xdrp) (&xdr, args)) {
1644 error (g, "dispatch failed to marshal args");
1649 /* Get the actual length of the message, resize the buffer to match
1650 * the actual length, and write the length word at the beginning.
1652 len = xdr_getpos (&xdr);
1655 g->msg_out = safe_realloc (g, g->msg_out, len + 4);
1656 g->msg_out_size = len + 4;
1659 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1660 xdr_uint32_t (&xdr, &len);
1662 if (guestfs__switch_to_sending (g) == -1)
1666 guestfs_set_send_callback (g, send_cb, &sent);
1667 if (ml->main_loop_run (ml, g) == -1)
1670 error (g, "send failed, see earlier error messages");
1679 g->msg_out_size = 0;
1683 static int cancel = 0; /* XXX Implement file cancellation. */
1684 static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
1685 static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
1686 static int send_file_cancellation_sync (guestfs_h *g);
1687 static int send_file_complete_sync (guestfs_h *g);
1689 /* Synchronously send a file.
1693 * -2 daemon cancelled (we must read the error message)
1696 guestfs__send_file_sync (guestfs_h *g, const char *filename)
1698 char buf[GUESTFS_MAX_CHUNK_SIZE];
1701 fd = open (filename, O_RDONLY);
1703 perrorf (g, "open: %s", filename);
1704 send_file_cancellation_sync (g);
1705 /* Daemon sees cancellation and won't reply, so caller can
1711 /* Send file in chunked encoding. */
1713 r = read (fd, buf, sizeof buf);
1714 if (r == -1 && (errno == EINTR || errno == EAGAIN))
1717 err = send_file_data_sync (g, buf, r);
1719 if (err == -2) /* daemon sent cancellation */
1720 send_file_cancellation_sync (g);
1725 if (cancel) { /* cancel from either end */
1726 send_file_cancellation_sync (g);
1731 perrorf (g, "read: %s", filename);
1732 send_file_cancellation_sync (g);
1736 /* End of file, but before we send that, we need to close
1737 * the file and check for errors.
1739 if (close (fd) == -1) {
1740 perrorf (g, "close: %s", filename);
1741 send_file_cancellation_sync (g);
1745 return send_file_complete_sync (g);
1748 /* Send a chunk of file data. */
1750 send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
1752 return send_file_chunk_sync (g, 0, buf, len);
1755 /* Send a cancellation message. */
1757 send_file_cancellation_sync (guestfs_h *g)
1759 return send_file_chunk_sync (g, 1, NULL, 0);
1762 /* Send a file complete chunk. */
1764 send_file_complete_sync (guestfs_h *g)
1767 return send_file_chunk_sync (g, 0, buf, 0);
1770 /* Send a chunk, cancellation or end of file, synchronously (ie. wait
1773 static int check_for_daemon_cancellation (guestfs_h *g);
1776 send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
1780 guestfs_chunk chunk;
1782 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1784 if (g->state != BUSY) {
1785 error (g, "send_file_chunk_sync: state %d != READY", g->state);
1789 /* This is probably an internal error. Or perhaps we should just
1790 * free the buffer anyway?
1792 if (g->msg_out != NULL) {
1793 error (g, "guestfs__send_sync: msg_out should be NULL");
1797 /* Did the daemon send a cancellation message? */
1798 if (check_for_daemon_cancellation (g)) {
1800 fprintf (stderr, "got daemon cancellation\n");
1804 /* Allocate the chunk buffer. Don't use the stack to avoid
1805 * excessive stack usage and unnecessary copies.
1807 g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
1808 xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
1810 /* Serialize the chunk. */
1811 chunk.cancel = cancel;
1812 chunk.data.data_len = buflen;
1813 chunk.data.data_val = (char *) buf;
1815 if (!xdr_guestfs_chunk (&xdr, &chunk)) {
1816 error (g, "xdr_guestfs_chunk failed (buf = %p, buflen = %zu)",
1822 len = xdr_getpos (&xdr);
1825 /* Reduce the size of the outgoing message buffer to the real length. */
1826 g->msg_out = safe_realloc (g, g->msg_out, len + 4);
1827 g->msg_out_size = len + 4;
1830 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1831 xdr_uint32_t (&xdr, &len);
1833 if (guestfs__switch_to_sending (g) == -1)
1837 guestfs_set_send_callback (g, send_cb, &sent);
1838 if (ml->main_loop_run (ml, g) == -1)
1841 error (g, "send file chunk failed, see earlier error messages");
1850 g->msg_out_size = 0;
1854 /* At this point we are sending FileIn file(s) to the guest, and not
1855 * expecting to read anything, so if we do read anything, it must be
1856 * a cancellation message. This checks for this case without blocking.
1859 check_for_daemon_cancellation (guestfs_h *g)
1869 FD_SET (g->sock, &rset);
1872 r = select (g->sock+1, &rset, NULL, NULL, &tv);
1874 perrorf (g, "select");
1880 /* Read the message from the daemon. */
1881 r = xread (g->sock, buf, sizeof buf);
1883 perrorf (g, "read");
1887 xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
1888 xdr_uint32_t (&xdr, &flag);
1891 if (flag != GUESTFS_CANCEL_FLAG) {
1892 error (g, "check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n",
1893 flag, GUESTFS_CANCEL_FLAG);
1900 /* Synchronously receive a file. */
1902 /* Returns -1 = error, 0 = EOF, 1 = more data */
1903 static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
1906 guestfs__receive_file_sync (guestfs_h *g, const char *filename)
1912 fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
1914 perrorf (g, "open: %s", filename);
1918 /* Receive the file in chunked encoding. */
1919 while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
1920 if (xwrite (fd, buf, len) == -1) {
1921 perrorf (g, "%s: write", filename);
1926 if (r == 0) break; /* End of file. */
1930 error (g, "%s: error in chunked encoding", filename);
1934 if (close (fd) == -1) {
1935 perrorf (g, "close: %s", filename);
1942 /* Send cancellation message to daemon, then wait until it
1943 * cancels (just throwing away data).
1947 uint32_t flag = GUESTFS_CANCEL_FLAG;
1949 xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
1950 xdr_uint32_t (&xdr, &flag);
1953 if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
1954 perrorf (g, "write to daemon socket");
1958 while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
1959 ; /* just discard it */
1964 /* Note that the reply callback can be called multiple times before
1965 * the main loop quits and we get back to the synchronous code. So
1966 * we have to be prepared to save multiple chunks on a list here.
1968 struct receive_file_ctx {
1969 int count; /* 0 if receive_file_cb not called, or
1970 * else count number of chunks.
1972 guestfs_chunk *chunks; /* Array of chunks. */
1976 free_chunks (struct receive_file_ctx *ctx)
1980 for (i = 0; i < ctx->count; ++i)
1981 free (ctx->chunks[i].data.data_val);
1987 receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
1989 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1990 struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
1991 guestfs_chunk chunk;
1993 if (ctx->count == -1) /* Parse error occurred previously. */
1996 ml->main_loop_quit (ml, g);
1998 memset (&chunk, 0, sizeof chunk);
2000 if (!xdr_guestfs_chunk (xdr, &chunk)) {
2001 error (g, "failed to parse file chunk");
2008 /* Copy the chunk to the list. */
2009 ctx->chunks = safe_realloc (g, ctx->chunks,
2010 sizeof (guestfs_chunk) * (ctx->count+1));
2011 ctx->chunks[ctx->count] = chunk;
2015 /* Receive a chunk of file data. */
2016 /* Returns -1 = error, 0 = EOF, 1 = more data */
2018 receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
2020 struct receive_file_ctx ctx;
2021 guestfs_main_loop *ml = guestfs_get_main_loop (g);
2028 guestfs_set_reply_callback (g, receive_file_cb, &ctx);
2029 (void) ml->main_loop_run (ml, g);
2030 guestfs_set_reply_callback (g, NULL, NULL);
2032 if (ctx.count == 0) {
2033 error (g, "receive_file_data_sync: reply callback not called\n");
2037 if (ctx.count == -1) {
2038 error (g, "receive_file_data_sync: parse error in reply callback\n");
2039 /* callback already freed the chunks */
2044 fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
2046 /* Process each chunk in the list. */
2047 if (buf) *buf = NULL; /* Accumulate data in this buffer. */
2050 for (i = 0; i < ctx.count; ++i) {
2051 if (ctx.chunks[i].cancel) {
2052 error (g, "file receive cancelled by daemon");
2054 if (buf) free (*buf);
2055 if (len_r) *len_r = 0;
2059 if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
2061 if (len_r) *len_r = len;
2066 *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
2067 memcpy (*buf+len, ctx.chunks[i].data.data_val,
2068 ctx.chunks[i].data.data_len);
2070 len += ctx.chunks[i].data.data_len;
2073 if (len_r) *len_r = len;
2078 /* This is the default main loop implementation, using select(2). */
2081 select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
2082 guestfs_handle_event_cb cb, void *data)
2084 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2086 if (fd < 0 || fd >= FD_SETSIZE) {
2087 error (g, "fd %d is out of range", fd);
2091 if ((events & ~(GUESTFS_HANDLE_READABLE |
2092 GUESTFS_HANDLE_WRITABLE |
2093 GUESTFS_HANDLE_HANGUP |
2094 GUESTFS_HANDLE_ERROR)) != 0) {
2095 error (g, "set of events (0x%x) contains unknown events", events);
2100 error (g, "set of events is empty");
2104 if (FD_ISSET (fd, &ml->rset) ||
2105 FD_ISSET (fd, &ml->wset) ||
2106 FD_ISSET (fd, &ml->xset)) {
2107 error (g, "fd %d is already registered", fd);
2112 error (g, "callback is NULL");
2116 if ((events & GUESTFS_HANDLE_READABLE))
2117 FD_SET (fd, &ml->rset);
2118 if ((events & GUESTFS_HANDLE_WRITABLE))
2119 FD_SET (fd, &ml->wset);
2120 if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
2121 FD_SET (fd, &ml->xset);
2123 if (fd > ml->max_fd) {
2125 ml->handle_cb_data =
2126 safe_realloc (g, ml->handle_cb_data,
2127 sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
2129 ml->handle_cb_data[fd].cb = cb;
2130 ml->handle_cb_data[fd].g = g;
2131 ml->handle_cb_data[fd].data = data;
2135 /* Any integer >= 0 can be the handle, and this is as good as any ... */
2140 select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
2142 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2144 if (fd < 0 || fd >= FD_SETSIZE) {
2145 error (g, "fd %d is out of range", fd);
2149 if (!FD_ISSET (fd, &ml->rset) &&
2150 !FD_ISSET (fd, &ml->wset) &&
2151 !FD_ISSET (fd, &ml->xset)) {
2152 error (g, "fd %d was not registered", fd);
2156 FD_CLR (fd, &ml->rset);
2157 FD_CLR (fd, &ml->wset);
2158 FD_CLR (fd, &ml->xset);
2160 if (fd == ml->max_fd) {
2162 ml->handle_cb_data =
2163 safe_realloc (g, ml->handle_cb_data,
2164 sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
2173 select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
2174 guestfs_handle_timeout_cb cb, void *data)
2176 //struct select_main_loop *ml = (struct select_main_loop *) mlv;
2178 abort (); /* XXX not implemented yet */
2182 select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
2184 //struct select_main_loop *ml = (struct select_main_loop *) mlv;
2186 abort (); /* XXX not implemented yet */
2189 /* The 'g' parameter is just used for error reporting. Events
2190 * for multiple handles can be dispatched by running the main
2194 select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
2196 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2198 fd_set rset2, wset2, xset2;
2200 if (ml->is_running) {
2201 error (g, "select_main_loop_run: this cannot be called recursively");
2207 while (ml->is_running) {
2208 if (ml->nr_fds == 0)
2214 r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
2216 if (errno == EINTR || errno == EAGAIN)
2218 perrorf (g, "select");
2223 for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
2225 if (FD_ISSET (fd, &rset2))
2226 events |= GUESTFS_HANDLE_READABLE;
2227 if (FD_ISSET (fd, &wset2))
2228 events |= GUESTFS_HANDLE_WRITABLE;
2229 if (FD_ISSET (fd, &xset2))
2230 events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
2233 ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
2234 ml->handle_cb_data[fd].g,
2235 ml->handle_cb_data[fd].data,
2246 select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
2248 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2250 /* Note that legitimately ml->is_running can be zero when
2251 * this function is called.