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 */
32 #include <sys/select.h>
33 #include <rpc/types.h>
40 #ifdef HAVE_SYS_TYPES_H
41 #include <sys/types.h>
44 #ifdef HAVE_SYS_WAIT_H
48 #ifdef HAVE_SYS_SOCKET_H
49 #include <sys/socket.h>
57 #include "guestfs_protocol.h"
59 static void error (guestfs_h *g, const char *fs, ...);
60 static void perrorf (guestfs_h *g, const char *fs, ...);
61 static void *safe_malloc (guestfs_h *g, int nbytes);
62 static void *safe_realloc (guestfs_h *g, void *ptr, int nbytes);
63 static char *safe_strdup (guestfs_h *g, const char *str);
65 static void default_error_cb (guestfs_h *g, void *data, const char *msg);
66 static void stdout_event (void *data, int watch, int fd, int events);
67 static void sock_read_event (void *data, int watch, int fd, int events);
68 static void sock_write_event (void *data, int watch, int fd, int events);
70 static void close_handles (void);
72 static int select_add_handle (guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
73 static int select_remove_handle (guestfs_h *g, int watch);
74 static int select_add_timeout (guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
75 static int select_remove_timeout (guestfs_h *g, int timer);
76 static void select_main_loop_run (guestfs_h *g);
77 static void select_main_loop_quit (guestfs_h *g);
79 #define UNIX_PATH_MAX 108
81 /* Also in guestfsd.c */
82 #define VMCHANNEL_PORT 6666
83 #define VMCHANNEL_ADDR "10.0.2.4"
85 /* Current main loop. */
86 static guestfs_main_loop main_loop = {
87 .add_handle = select_add_handle,
88 .remove_handle = select_remove_handle,
89 .add_timeout = select_add_timeout,
90 .remove_timeout = select_remove_timeout,
91 .main_loop_run = select_main_loop_run,
92 .main_loop_quit = select_main_loop_quit,
95 /* GuestFS handle and connection. */
96 enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
100 struct guestfs_h *next; /* Linked list of open handles. */
102 /* State: see the state machine diagram in the man page guestfs(3). */
105 int fd[2]; /* Stdin/stdout of qemu. */
106 int sock; /* Daemon communications socket. */
107 int pid; /* Qemu PID. */
108 time_t start_t; /* The time when we started qemu. */
110 int stdout_watch; /* Watches qemu stdout for log messages. */
111 int sock_watch; /* Watches daemon comm socket. */
113 char *tmpdir; /* Temporary directory containing socket. */
115 char **cmdline; /* Qemu command line. */
122 guestfs_abort_cb abort_cb;
123 guestfs_error_handler_cb error_cb;
124 void * error_cb_data;
125 guestfs_reply_cb reply_cb;
126 void * reply_cb_data;
127 guestfs_log_message_cb log_message_cb;
128 void * log_message_cb_data;
129 guestfs_subprocess_quit_cb subprocess_quit_cb;
130 void * subprocess_quit_cb_data;
131 guestfs_launch_done_cb launch_done_cb;
132 void * launch_done_cb_data;
134 /* These callbacks are called before reply_cb and launch_done_cb,
135 * and are used to implement the high-level API without needing to
136 * interfere with callbacks that the user might have set.
138 guestfs_reply_cb reply_cb_internal;
139 void * reply_cb_internal_data;
140 guestfs_launch_done_cb launch_done_cb_internal;
141 void * launch_done_cb_internal_data;
143 /* Messages sent and received from the daemon. */
145 int msg_in_size, msg_in_allocated;
147 int msg_out_size, msg_out_pos;
152 static guestfs_h *handles = NULL;
153 static int atexit_handler_set = 0;
156 guestfs_create (void)
161 g = malloc (sizeof (*g));
164 memset (g, 0, sizeof (*g));
171 g->stdout_watch = -1;
175 g->error_cb = default_error_cb;
176 g->error_cb_data = NULL;
178 str = getenv ("LIBGUESTFS_DEBUG");
179 g->verbose = str != NULL && strcmp (str, "1") == 0;
181 /* Start with large serial numbers so they are easy to spot
182 * inside the protocol.
184 g->msg_next_serial = 0x00123400;
186 /* Link the handles onto a global list. This is the one area
187 * where the library needs to be made thread-safe. (XXX)
189 /* acquire mutex (XXX) */
192 if (!atexit_handler_set) {
193 atexit (close_handles);
194 atexit_handler_set = 1;
196 /* release mutex (XXX) */
199 fprintf (stderr, "new guestfs handle %p\n", g);
205 guestfs_close (guestfs_h *g)
211 if (g->state == NO_HANDLE) {
212 /* Not safe to call 'error' here, so ... */
213 fprintf (stderr, "guestfs_close: called twice on the same handle\n");
218 fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
220 /* Try to sync if autosync flag is set. */
221 if (g->autosync && g->state == READY)
224 /* Remove any handlers that might be called back before we kill the
227 g->log_message_cb = NULL;
229 if (g->state != CONFIG)
230 guestfs_kill_subprocess (g);
233 snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
242 for (i = 0; i < g->cmdline_size; ++i)
243 free (g->cmdline[i]);
247 /* Mark the handle as dead before freeing it. */
248 g->state = NO_HANDLE;
250 /* acquire mutex (XXX) */
254 for (gg = handles; gg->next != g; gg = gg->next)
258 /* release mutex (XXX) */
263 /* Close all open handles (called from atexit(3)). */
267 while (handles) guestfs_close (handles);
271 default_error_cb (guestfs_h *g, void *data, const char *msg)
273 fprintf (stderr, "libguestfs: error: %s\n", msg);
277 error (guestfs_h *g, const char *fs, ...)
282 if (!g->error_cb) return;
285 vasprintf (&msg, fs, args);
288 g->error_cb (g, g->error_cb_data, msg);
294 perrorf (guestfs_h *g, const char *fs, ...)
300 if (!g->error_cb) return;
303 vasprintf (&msg, fs, args);
308 strerror_r (err, buf, sizeof buf);
312 buf = strerror_r (err, _buf, sizeof _buf);
315 msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
319 g->error_cb (g, g->error_cb_data, msg);
325 safe_malloc (guestfs_h *g, int nbytes)
327 void *ptr = malloc (nbytes);
328 if (!ptr) g->abort_cb ();
333 safe_realloc (guestfs_h *g, void *ptr, int nbytes)
335 void *p = realloc (ptr, nbytes);
336 if (!p) g->abort_cb ();
341 safe_strdup (guestfs_h *g, const char *str)
343 char *s = strdup (str);
344 if (!s) g->abort_cb ();
349 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
355 guestfs_get_out_of_memory_handler (guestfs_h *g)
361 guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
364 g->error_cb_data = data;
367 guestfs_error_handler_cb
368 guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
370 if (data_rtn) *data_rtn = g->error_cb_data;
375 guestfs_set_verbose (guestfs_h *g, int v)
381 guestfs_get_verbose (guestfs_h *g)
387 guestfs_set_autosync (guestfs_h *g, int a)
393 guestfs_get_autosync (guestfs_h *g)
398 /* Add a string to the current command line. */
400 incr_cmdline_size (guestfs_h *g)
402 if (g->cmdline == NULL) {
403 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
405 g->cmdline = safe_malloc (g, sizeof (char *));
406 g->cmdline[0] = NULL;
410 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
414 add_cmdline (guestfs_h *g, const char *str)
416 if (g->state != CONFIG) {
417 error (g, "command line cannot be altered after qemu subprocess launched");
421 incr_cmdline_size (g);
422 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
427 guestfs_config (guestfs_h *g,
428 const char *qemu_param, const char *qemu_value)
430 if (qemu_param[0] != '-') {
431 error (g, "guestfs_config: parameter must begin with '-' character");
435 /* A bit fascist, but the user will probably break the extra
436 * parameters that we add if they try to set any of these.
438 if (strcmp (qemu_param, "-kernel") == 0 ||
439 strcmp (qemu_param, "-initrd") == 0 ||
440 strcmp (qemu_param, "-nographic") == 0 ||
441 strcmp (qemu_param, "-serial") == 0 ||
442 strcmp (qemu_param, "-vnc") == 0 ||
443 strcmp (qemu_param, "-full-screen") == 0 ||
444 strcmp (qemu_param, "-std-vga") == 0 ||
445 strcmp (qemu_param, "-vnc") == 0) {
446 error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
450 if (add_cmdline (g, qemu_param) != 0) return -1;
452 if (qemu_value != NULL) {
453 if (add_cmdline (g, qemu_value) != 0) return -1;
460 guestfs_add_drive (guestfs_h *g, const char *filename)
462 int len = strlen (filename) + 64;
465 if (strchr (filename, ',') != NULL) {
466 error (g, "filename cannot contain ',' (comma) character");
470 snprintf (buf, len, "file=%s", filename);
472 return guestfs_config (g, "-drive", buf);
476 guestfs_add_cdrom (guestfs_h *g, const char *filename)
478 if (strchr (filename, ',') != NULL) {
479 error (g, "filename cannot contain ',' (comma) character");
483 return guestfs_config (g, "-cdrom", filename);
487 guestfs_launch (guestfs_h *g)
489 static const char *dir_template = "/tmp/libguestfsXXXXXX";
493 /*const char *qemu = QEMU;*/ /* XXX */
494 const char *qemu = "/usr/bin/qemu-system-x86_64";
495 const char *kernel = "vmlinuz.fedora-10.x86_64";
496 const char *initrd = "initramfs.fedora-10.x86_64.img";
498 struct sockaddr_un addr;
500 /* XXX Choose which qemu to run. */
501 /* XXX Choose initrd, etc. */
505 error (g, "you must call guestfs_add_drive before guestfs_launch");
509 if (g->state != CONFIG) {
510 error (g, "qemu has already been launched");
514 /* Make the temporary directory containing the socket. */
516 g->tmpdir = safe_strdup (g, dir_template);
517 if (mkdtemp (g->tmpdir) == NULL) {
518 perrorf (g, "%s: cannot create temporary directory", dir_template);
523 snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
526 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
541 if (r == 0) { /* Child (qemu). */
545 /* Set up the full command line. Do this in the subprocess so we
546 * don't need to worry about cleaning up.
548 g->cmdline[0] = (char *) qemu;
550 /* Construct the -net channel parameter for qemu. */
551 snprintf (vmchannel, sizeof vmchannel,
552 "channel,%d:unix:%s,server,nowait",
553 VMCHANNEL_PORT, unixsock);
555 /* Linux kernel command line. */
556 snprintf (append, sizeof append,
557 "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
559 add_cmdline (g, "-m");
560 add_cmdline (g, "384"); /* XXX Choose best size. */
561 add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
562 add_cmdline (g, "-kernel");
563 add_cmdline (g, (char *) kernel);
564 add_cmdline (g, "-initrd");
565 add_cmdline (g, (char *) initrd);
566 add_cmdline (g, "-append");
567 add_cmdline (g, append);
568 add_cmdline (g, "-nographic");
569 add_cmdline (g, "-serial");
570 add_cmdline (g, "stdio");
571 add_cmdline (g, "-net");
572 add_cmdline (g, vmchannel);
573 add_cmdline (g, "-net");
574 add_cmdline (g, "user,vlan=0");
575 add_cmdline (g, "-net");
576 add_cmdline (g, "nic,vlan=0");
577 incr_cmdline_size (g);
578 g->cmdline[g->cmdline_size-1] = NULL;
581 fprintf (stderr, "%s", qemu);
582 for (i = 0; g->cmdline[i]; ++i)
583 fprintf (stderr, " %s", g->cmdline[i]);
584 fprintf (stderr, "\n");
587 /* Set up stdin, stdout. */
598 /* Set up a new process group, so we can signal this process
599 * and all subprocesses (eg. if qemu is really a shell script).
604 execv (qemu, g->cmdline); /* Run qemu. */
609 /* Parent (library). */
612 /* Start the clock ... */
615 /* Close the other ends of the pipe. */
619 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
620 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
621 perrorf (g, "fcntl");
625 g->fd[0] = wfd[1]; /* stdin of child */
626 g->fd[1] = rfd[0]; /* stdout of child */
628 /* Open the Unix socket. The vmchannel implementation that got
629 * merged with qemu sucks in a number of ways. Both ends do
630 * connect(2), which means that no one knows what, if anything, is
631 * connected to the other end, or if it becomes disconnected. Even
632 * worse, we have to wait some indeterminate time for qemu to create
633 * the socket and connect to it (which happens very early in qemu's
634 * start-up), so any code that uses vmchannel is inherently racy.
635 * Hence this silly loop.
637 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
639 perrorf (g, "socket");
643 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
644 perrorf (g, "fcntl");
648 addr.sun_family = AF_UNIX;
649 strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
650 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
654 /* Always sleep at least once to give qemu a small chance to start up. */
657 r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
658 if ((r == -1 && errno == EINPROGRESS) || r == 0)
662 perrorf (g, "connect");
666 error (g, "failed to connect to vmchannel socket");
670 /* Watch the file descriptors. */
673 g->msg_in_size = g->msg_in_allocated = 0;
681 main_loop.add_handle (g, g->fd[1],
682 GUESTFS_HANDLE_READABLE,
684 if (g->stdout_watch == -1) {
685 error (g, "could not watch qemu stdout");
690 main_loop.add_handle (g, g->sock,
691 GUESTFS_HANDLE_READABLE,
693 if (g->sock_watch == -1) {
694 error (g, "could not watch daemon communications socket");
698 g->state = LAUNCHING;
702 if (g->stdout_watch >= 0)
703 main_loop.remove_handle (g, g->stdout_watch);
704 if (g->sock_watch >= 0)
705 main_loop.remove_handle (g, g->sock_watch);
714 waitpid (g->pid, NULL, 0);
720 g->stdout_watch = -1;
726 finish_wait_ready (guestfs_h *g, void *vp)
729 main_loop.main_loop_quit (g);
733 guestfs_wait_ready (guestfs_h *g)
737 if (g->state == READY) return 0;
739 if (g->state == BUSY) {
740 error (g, "qemu has finished launching already");
744 if (g->state != LAUNCHING) {
745 error (g, "qemu has not been launched yet");
749 g->launch_done_cb_internal = finish_wait_ready;
750 g->launch_done_cb_internal_data = &r;
751 main_loop.main_loop_run (g);
752 g->launch_done_cb_internal = NULL;
753 g->launch_done_cb_internal_data = NULL;
756 error (g, "guestfs_wait_ready failed, see earlier error messages");
760 /* This is possible in some really strange situations, such as
761 * guestfsd starts up OK but then qemu immediately exits. Check for
762 * it because the caller is probably expecting to be able to send
763 * commands after this function returns.
765 if (g->state != READY) {
766 error (g, "qemu launched and contacted daemon, but state != READY");
774 guestfs_kill_subprocess (guestfs_h *g)
776 if (g->state == CONFIG) {
777 error (g, "no subprocess to kill");
782 fprintf (stderr, "sending SIGTERM to process group %d\n", g->pid);
784 kill (g->pid, SIGTERM);
789 /* This function is called whenever qemu prints something on stdout.
790 * Qemu's stdout is also connected to the guest's serial console, so
791 * we see kernel messages here too.
794 stdout_event (void *data, int watch, int fd, int events)
796 guestfs_h *g = (guestfs_h *) data;
803 "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
804 g, g->state, fd, events);
807 if (g->fd[1] != fd) {
808 error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
812 n = read (fd, buf, sizeof buf);
814 /* Hopefully this indicates the qemu child process has died. */
816 fprintf (stderr, "stdout_event: %p: child process died\n", g);
817 /*kill (g->pid, SIGTERM);*/
818 waitpid (g->pid, NULL, 0);
819 if (g->stdout_watch >= 0)
820 main_loop.remove_handle (g, g->stdout_watch);
821 if (g->sock_watch >= 0)
822 main_loop.remove_handle (g, g->sock_watch);
831 g->stdout_watch = -1;
834 if (g->subprocess_quit_cb)
835 g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
845 /* In verbose mode, copy all log messages to stderr. */
849 /* It's an actual log message, send it upwards if anyone is listening. */
850 if (g->log_message_cb)
851 g->log_message_cb (g, g->log_message_cb_data, buf, n);
854 /* The function is called whenever we can read something on the
855 * guestfsd (daemon inside the guest) communication socket.
858 sock_read_event (void *data, int watch, int fd, int events)
860 guestfs_h *g = (guestfs_h *) data;
867 "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
868 g, g->state, fd, events);
871 error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
875 if (g->msg_in_size <= g->msg_in_allocated) {
876 g->msg_in_allocated += 4096;
877 g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
879 n = read (g->sock, g->msg_in + g->msg_in_size,
880 g->msg_in_allocated - g->msg_in_size);
882 /* Disconnected? Ignore it because stdout_watch will get called
883 * and will do the cleanup.
895 /* Have we got enough of a message to be able to process it yet? */
896 if (g->msg_in_size < 4) return;
898 xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
899 if (!xdr_uint32_t (&xdr, &len)) {
900 error (g, "can't decode length word");
904 /* Length is normally the length of the message, but when guestfsd
905 * starts up it sends a "magic" value (longer than any possible
906 * message). Check for this.
908 if (len == 0xf5f55ff5) {
909 if (g->state != LAUNCHING)
910 error (g, "received magic signature from guestfsd, but in state %d",
912 else if (g->msg_in_size != 4)
913 error (g, "received magic signature from guestfsd, but msg size is %d",
917 if (g->launch_done_cb_internal)
918 g->launch_done_cb_internal (g, g->launch_done_cb_internal_data);
919 if (g->launch_done_cb)
920 g->launch_done_cb (g, g->launch_done_cb_data);
926 /* If this happens, it's pretty bad and we've probably lost synchronization.*/
927 if (len > GUESTFS_MESSAGE_MAX) {
928 error (g, "message length (%u) > maximum possible size (%d)",
929 len, GUESTFS_MESSAGE_MAX);
933 if (g->msg_in_size-4 < len) return; /* Need more of this message. */
935 /* This should not happen, and if it does it probably means we've
936 * lost all hope of synchronization.
938 if (g->msg_in_size-4 > len) {
939 error (g, "len = %d, but msg_in_size-4 = %d", len, g->msg_in_size-4);
943 /* Not in the expected state. */
944 if (g->state != BUSY)
945 error (g, "state %d != BUSY", g->state);
947 /* Push the message up to the higher layer. Note that unlike
948 * launch_done_cb / launch_done_cb_internal, we only call at
949 * most one of the callback functions here.
952 if (g->reply_cb_internal)
953 g->reply_cb_internal (g, g->reply_cb_internal_data, &xdr);
954 else if (g->reply_cb)
955 g->reply_cb (g, g->reply_cb, &xdr);
958 /* Free the message buffer if it's grown excessively large. */
959 if (g->msg_in_allocated > 65536) {
962 g->msg_in_size = g->msg_in_allocated = 0;
969 /* The function is called whenever we can write something on the
970 * guestfsd (daemon inside the guest) communication socket.
973 sock_write_event (void *data, int watch, int fd, int events)
975 guestfs_h *g = (guestfs_h *) data;
980 "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
981 g, g->state, fd, events);
984 error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
988 if (g->state != BUSY) {
989 error (g, "sock_write_event: state %d != BUSY", g->state);
994 fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
995 g->msg_out_size - g->msg_out_pos);
997 n = write (g->sock, g->msg_out + g->msg_out_pos,
998 g->msg_out_size - g->msg_out_pos);
1000 if (errno != EAGAIN)
1001 perrorf (g, "write");
1006 fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
1008 g->msg_out_pos += n;
1010 /* More to write? */
1011 if (g->msg_out_pos < g->msg_out_size)
1015 fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n");
1018 g->msg_out_pos = g->msg_out_size = 0;
1020 if (main_loop.remove_handle (g, g->sock_watch) == -1) {
1021 error (g, "remove_handle failed in sock_write_event");
1025 main_loop.add_handle (g, g->sock,
1026 GUESTFS_HANDLE_READABLE,
1027 sock_read_event, g);
1028 if (g->sock_watch == -1) {
1029 error (g, "add_handle failed in sock_write_event");
1034 /* Dispatch a call to the remote daemon. This function just queues
1035 * the call in msg_out, to be sent when we next enter the main loop.
1036 * Returns -1 for error, or the message serial number.
1039 dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
1041 char buffer[GUESTFS_MESSAGE_MAX];
1042 struct guestfs_message_header hdr;
1045 int serial = g->msg_next_serial++;
1047 if (g->state != READY) {
1048 error (g, "dispatch: state %d != READY", g->state);
1052 /* Serialize the header. */
1053 hdr.prog = GUESTFS_PROGRAM;
1054 hdr.vers = GUESTFS_PROTOCOL_VERSION;
1056 hdr.direction = GUESTFS_DIRECTION_CALL;
1057 hdr.serial = serial;
1058 hdr.status = GUESTFS_STATUS_OK;
1060 xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
1061 if (!xdr_guestfs_message_header (&xdr, &hdr)) {
1062 error (g, "xdr_guestfs_message_header failed");
1066 /* Serialize the args. If any, because some message types
1067 * have no parameters.
1070 if (!(*xdrp) (&xdr, args)) {
1071 error (g, "dispatch failed to marshal args");
1076 len = xdr_getpos (&xdr);
1079 /* Allocate the outgoing message buffer. */
1080 g->msg_out = safe_malloc (g, len + 4);
1082 g->msg_out_size = len + 4;
1086 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1087 if (!xdr_uint32_t (&xdr, &len)) {
1088 error (g, "xdr_uint32_t failed in dispatch");
1092 memcpy (g->msg_out + 4, buffer, len);
1094 /* Change the handle to sock_write_event. */
1095 if (main_loop.remove_handle (g, g->sock_watch) == -1) {
1096 error (g, "remove_handle failed in dispatch");
1100 main_loop.add_handle (g, g->sock,
1101 GUESTFS_HANDLE_WRITABLE,
1102 sock_write_event, g);
1103 if (g->sock_watch == -1) {
1104 error (g, "add_handle failed in dispatch");
1113 g->msg_out_size = 0;
1118 /* Check the return message from a call for validity. */
1120 check_reply_header (guestfs_h *g,
1121 const struct guestfs_message_header *hdr,
1122 int proc_nr, int serial)
1124 if (hdr->prog != GUESTFS_PROGRAM) {
1125 error (g, "wrong program (%d/%d)", hdr->prog, GUESTFS_PROGRAM);
1128 if (hdr->vers != GUESTFS_PROTOCOL_VERSION) {
1129 error (g, "wrong protocol version (%d/%d)",
1130 hdr->vers, GUESTFS_PROTOCOL_VERSION);
1133 if (hdr->direction != GUESTFS_DIRECTION_REPLY) {
1134 error (g, "unexpected message direction (%d/%d)",
1135 hdr->direction, GUESTFS_DIRECTION_REPLY);
1138 if (hdr->proc != proc_nr) {
1139 error (g, "unexpected procedure number (%d/%d)", hdr->proc, proc_nr);
1142 if (hdr->serial != serial) {
1143 error (g, "unexpected serial (%d/%d)", hdr->serial, serial);
1150 /* The high-level actions are autogenerated by generator.ml. Include
1153 #include "guestfs-actions.c"
1155 /* This is the default main loop implementation, using select(2). */
1157 struct handle_cb_data {
1158 guestfs_handle_event_cb cb;
1165 static int select_init_done = 0;
1166 static int max_fd = -1;
1167 static int nr_fds = 0;
1168 static struct handle_cb_data *handle_cb_data = NULL;
1173 if (!select_init_done) {
1178 select_init_done = 1;
1183 select_add_handle (guestfs_h *g, int fd, int events,
1184 guestfs_handle_event_cb cb, void *data)
1188 if (fd < 0 || fd >= FD_SETSIZE) {
1189 error (g, "fd %d is out of range", fd);
1193 if ((events & ~(GUESTFS_HANDLE_READABLE |
1194 GUESTFS_HANDLE_WRITABLE |
1195 GUESTFS_HANDLE_HANGUP |
1196 GUESTFS_HANDLE_ERROR)) != 0) {
1197 error (g, "set of events (0x%x) contains unknown events", events);
1202 error (g, "set of events is empty");
1206 if (FD_ISSET (fd, &rset) || FD_ISSET (fd, &wset) || FD_ISSET (fd, &xset)) {
1207 error (g, "fd %d is already registered", fd);
1212 error (g, "callback is NULL");
1216 if ((events & GUESTFS_HANDLE_READABLE))
1218 if ((events & GUESTFS_HANDLE_WRITABLE))
1220 if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
1225 handle_cb_data = safe_realloc (g, handle_cb_data,
1226 sizeof (struct handle_cb_data) * (max_fd+1));
1228 handle_cb_data[fd].cb = cb;
1229 handle_cb_data[fd].data = data;
1233 /* Any integer >= 0 can be the handle, and this is as good as any ... */
1238 select_remove_handle (guestfs_h *g, int fd)
1242 if (fd < 0 || fd >= FD_SETSIZE) {
1243 error (g, "fd %d is out of range", fd);
1247 if (!FD_ISSET (fd, &rset) && !FD_ISSET (fd, &wset) && !FD_ISSET (fd, &xset)) {
1248 error (g, "fd %d was not registered", fd);
1258 handle_cb_data = safe_realloc (g, handle_cb_data,
1259 sizeof (struct handle_cb_data) * (max_fd+1));
1268 select_add_timeout (guestfs_h *g, int interval,
1269 guestfs_handle_timeout_cb cb, void *data)
1273 abort (); /* XXX not implemented yet */
1277 select_remove_timeout (guestfs_h *g, int timer)
1281 abort (); /* XXX not implemented yet */
1284 /* Note that main loops can be nested. */
1285 static int level = 0;
1288 select_main_loop_run (guestfs_h *g)
1290 int old_level, fd, r, events;
1291 fd_set rset2, wset2, xset2;
1295 old_level = level++;
1296 while (level > old_level) {
1305 r = select (max_fd+1, &rset2, &wset2, &xset2, NULL);
1307 perrorf (g, "select");
1312 for (fd = 0; r > 0 && fd <= max_fd; ++fd) {
1314 if (FD_ISSET (fd, &rset2))
1315 events |= GUESTFS_HANDLE_READABLE;
1316 if (FD_ISSET (fd, &wset2))
1317 events |= GUESTFS_HANDLE_WRITABLE;
1318 if (FD_ISSET (fd, &xset2))
1319 events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
1322 handle_cb_data[fd].cb (handle_cb_data[fd].data,
1330 select_main_loop_quit (guestfs_h *g)
1335 error (g, "cannot quit, we are not in a main loop");