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. */
121 guestfs_abort_cb abort_cb;
122 guestfs_error_handler_cb error_cb;
123 void * error_cb_data;
124 guestfs_reply_cb reply_cb;
125 void * reply_cb_data;
126 guestfs_log_message_cb log_message_cb;
127 void * log_message_cb_data;
128 guestfs_subprocess_quit_cb subprocess_quit_cb;
129 void * subprocess_quit_cb_data;
130 guestfs_launch_done_cb launch_done_cb;
131 void * launch_done_cb_data;
133 /* These callbacks are called before reply_cb and launch_done_cb,
134 * and are used to implement the high-level API without needing to
135 * interfere with callbacks that the user might have set.
137 guestfs_reply_cb reply_cb_internal;
138 void * reply_cb_internal_data;
139 guestfs_launch_done_cb launch_done_cb_internal;
140 void * launch_done_cb_internal_data;
142 /* Messages sent and received from the daemon. */
144 int msg_in_size, msg_in_allocated;
146 int msg_out_size, msg_out_pos;
151 static guestfs_h *handles = NULL;
152 static int atexit_handler_set = 0;
155 guestfs_create (void)
160 g = malloc (sizeof (*g));
163 memset (g, 0, sizeof (*g));
170 g->stdout_watch = -1;
174 g->error_cb = default_error_cb;
175 g->error_cb_data = NULL;
177 str = getenv ("LIBGUESTFS_DEBUG");
178 g->verbose = str != NULL && strcmp (str, "1") == 0;
180 /* Start with large serial numbers so they are easy to spot
181 * inside the protocol.
183 g->msg_next_serial = 0x00123400;
185 /* Link the handles onto a global list. This is the one area
186 * where the library needs to be made thread-safe. (XXX)
188 /* acquire mutex (XXX) */
191 if (!atexit_handler_set) {
192 atexit (close_handles);
193 atexit_handler_set = 1;
195 /* release mutex (XXX) */
198 fprintf (stderr, "new guestfs handle %p\n", g);
204 guestfs_close (guestfs_h *g)
210 if (g->state == NO_HANDLE) {
211 /* Not safe to call 'error' here, so ... */
212 fprintf (stderr, "guestfs_close: called twice on the same handle\n");
217 fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
219 /* Remove any handlers that might be called back before we kill the
222 g->log_message_cb = NULL;
224 if (g->state != CONFIG)
225 guestfs_kill_subprocess (g);
228 snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
237 for (i = 0; i < g->cmdline_size; ++i)
238 free (g->cmdline[i]);
242 /* Mark the handle as dead before freeing it. */
243 g->state = NO_HANDLE;
245 /* acquire mutex (XXX) */
249 for (gg = handles; gg->next != g; gg = gg->next)
253 /* release mutex (XXX) */
258 /* Close all open handles (called from atexit(3)). */
262 while (handles) guestfs_close (handles);
266 default_error_cb (guestfs_h *g, void *data, const char *msg)
268 fprintf (stderr, "libguestfs: error: %s\n", msg);
272 error (guestfs_h *g, const char *fs, ...)
277 if (!g->error_cb) return;
280 vasprintf (&msg, fs, args);
283 g->error_cb (g, g->error_cb_data, msg);
289 perrorf (guestfs_h *g, const char *fs, ...)
295 if (!g->error_cb) return;
298 vasprintf (&msg, fs, args);
303 strerror_r (err, buf, sizeof buf);
307 buf = strerror_r (err, _buf, sizeof _buf);
310 msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
314 g->error_cb (g, g->error_cb_data, msg);
320 safe_malloc (guestfs_h *g, int nbytes)
322 void *ptr = malloc (nbytes);
323 if (!ptr) g->abort_cb ();
328 safe_realloc (guestfs_h *g, void *ptr, int nbytes)
330 void *p = realloc (ptr, nbytes);
331 if (!p) g->abort_cb ();
336 safe_strdup (guestfs_h *g, const char *str)
338 char *s = strdup (str);
339 if (!s) g->abort_cb ();
344 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
350 guestfs_get_out_of_memory_handler (guestfs_h *g)
356 guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
359 g->error_cb_data = data;
362 guestfs_error_handler_cb
363 guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
365 if (data_rtn) *data_rtn = g->error_cb_data;
370 guestfs_set_verbose (guestfs_h *g, int v)
376 guestfs_get_verbose (guestfs_h *g)
381 /* Add a string to the current command line. */
383 incr_cmdline_size (guestfs_h *g)
385 if (g->cmdline == NULL) {
386 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
388 g->cmdline = safe_malloc (g, sizeof (char *));
389 g->cmdline[0] = NULL;
393 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
397 add_cmdline (guestfs_h *g, const char *str)
399 if (g->state != CONFIG) {
400 error (g, "command line cannot be altered after qemu subprocess launched");
404 incr_cmdline_size (g);
405 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
410 guestfs_config (guestfs_h *g,
411 const char *qemu_param, const char *qemu_value)
413 if (qemu_param[0] != '-') {
414 error (g, "guestfs_config: parameter must begin with '-' character");
418 /* A bit fascist, but the user will probably break the extra
419 * parameters that we add if they try to set any of these.
421 if (strcmp (qemu_param, "-kernel") == 0 ||
422 strcmp (qemu_param, "-initrd") == 0 ||
423 strcmp (qemu_param, "-nographic") == 0 ||
424 strcmp (qemu_param, "-serial") == 0 ||
425 strcmp (qemu_param, "-vnc") == 0 ||
426 strcmp (qemu_param, "-full-screen") == 0 ||
427 strcmp (qemu_param, "-std-vga") == 0 ||
428 strcmp (qemu_param, "-vnc") == 0) {
429 error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
433 if (add_cmdline (g, qemu_param) != 0) return -1;
435 if (qemu_value != NULL) {
436 if (add_cmdline (g, qemu_value) != 0) return -1;
443 guestfs_add_drive (guestfs_h *g, const char *filename)
445 int len = strlen (filename) + 64;
448 if (strchr (filename, ',') != NULL) {
449 error (g, "filename cannot contain ',' (comma) character");
453 snprintf (buf, len, "file=%s", filename);
455 return guestfs_config (g, "-drive", buf);
459 guestfs_add_cdrom (guestfs_h *g, const char *filename)
461 if (strchr (filename, ',') != NULL) {
462 error (g, "filename cannot contain ',' (comma) character");
466 return guestfs_config (g, "-cdrom", filename);
470 guestfs_launch (guestfs_h *g)
472 static const char *dir_template = "/tmp/libguestfsXXXXXX";
476 /*const char *qemu = QEMU;*/ /* XXX */
477 const char *qemu = "/usr/bin/qemu-system-x86_64";
478 const char *kernel = "vmlinuz.fedora-10.x86_64";
479 const char *initrd = "initramfs.fedora-10.x86_64.img";
481 struct sockaddr_un addr;
483 /* XXX Choose which qemu to run. */
484 /* XXX Choose initrd, etc. */
488 error (g, "you must call guestfs_add_drive before guestfs_launch");
492 if (g->state != CONFIG) {
493 error (g, "qemu has already been launched");
497 /* Make the temporary directory containing the socket. */
499 g->tmpdir = safe_strdup (g, dir_template);
500 if (mkdtemp (g->tmpdir) == NULL) {
501 perrorf (g, "%s: cannot create temporary directory", dir_template);
506 snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
509 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
524 if (r == 0) { /* Child (qemu). */
528 /* Set up the full command line. Do this in the subprocess so we
529 * don't need to worry about cleaning up.
531 g->cmdline[0] = (char *) qemu;
533 /* Construct the -net channel parameter for qemu. */
534 snprintf (vmchannel, sizeof vmchannel,
535 "channel,%d:unix:%s,server,nowait",
536 VMCHANNEL_PORT, unixsock);
538 /* Linux kernel command line. */
539 snprintf (append, sizeof append,
540 "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
542 add_cmdline (g, "-m");
543 add_cmdline (g, "384"); /* XXX Choose best size. */
544 add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
545 add_cmdline (g, "-kernel");
546 add_cmdline (g, (char *) kernel);
547 add_cmdline (g, "-initrd");
548 add_cmdline (g, (char *) initrd);
549 add_cmdline (g, "-append");
550 add_cmdline (g, append);
551 add_cmdline (g, "-nographic");
552 add_cmdline (g, "-serial");
553 add_cmdline (g, "stdio");
554 add_cmdline (g, "-net");
555 add_cmdline (g, vmchannel);
556 add_cmdline (g, "-net");
557 add_cmdline (g, "user,vlan=0");
558 add_cmdline (g, "-net");
559 add_cmdline (g, "nic,vlan=0");
560 incr_cmdline_size (g);
561 g->cmdline[g->cmdline_size-1] = NULL;
564 fprintf (stderr, "%s", qemu);
565 for (i = 0; g->cmdline[i]; ++i)
566 fprintf (stderr, " %s", g->cmdline[i]);
567 fprintf (stderr, "\n");
570 /* Set up stdin, stdout. */
581 /* Set up a new process group, so we can signal this process
582 * and all subprocesses (eg. if qemu is really a shell script).
587 execv (qemu, g->cmdline); /* Run qemu. */
592 /* Parent (library). */
595 /* Start the clock ... */
598 /* Close the other ends of the pipe. */
602 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
603 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
604 perrorf (g, "fcntl");
608 g->fd[0] = wfd[1]; /* stdin of child */
609 g->fd[1] = rfd[0]; /* stdout of child */
611 /* Open the Unix socket. The vmchannel implementation that got
612 * merged with qemu sucks in a number of ways. Both ends do
613 * connect(2), which means that no one knows what, if anything, is
614 * connected to the other end, or if it becomes disconnected. Even
615 * worse, we have to wait some indeterminate time for qemu to create
616 * the socket and connect to it (which happens very early in qemu's
617 * start-up), so any code that uses vmchannel is inherently racy.
618 * Hence this silly loop.
620 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
622 perrorf (g, "socket");
626 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
627 perrorf (g, "fcntl");
631 addr.sun_family = AF_UNIX;
632 strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
633 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
637 /* Always sleep at least once to give qemu a small chance to start up. */
640 r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
641 if ((r == -1 && errno == EINPROGRESS) || r == 0)
645 perrorf (g, "connect");
649 error (g, "failed to connect to vmchannel socket");
653 /* Watch the file descriptors. */
656 g->msg_in_size = g->msg_in_allocated = 0;
664 main_loop.add_handle (g, g->fd[1],
665 GUESTFS_HANDLE_READABLE,
667 if (g->stdout_watch == -1) {
668 error (g, "could not watch qemu stdout");
673 main_loop.add_handle (g, g->sock,
674 GUESTFS_HANDLE_READABLE,
676 if (g->sock_watch == -1) {
677 error (g, "could not watch daemon communications socket");
681 g->state = LAUNCHING;
685 if (g->stdout_watch >= 0)
686 main_loop.remove_handle (g, g->stdout_watch);
687 if (g->sock_watch >= 0)
688 main_loop.remove_handle (g, g->sock_watch);
697 waitpid (g->pid, NULL, 0);
703 g->stdout_watch = -1;
709 finish_wait_ready (guestfs_h *g, void *vp)
712 main_loop.main_loop_quit (g);
716 guestfs_wait_ready (guestfs_h *g)
720 if (g->state == READY) return 0;
722 if (g->state == BUSY) {
723 error (g, "qemu has finished launching already");
727 if (g->state != LAUNCHING) {
728 error (g, "qemu has not been launched yet");
732 g->launch_done_cb_internal = finish_wait_ready;
733 g->launch_done_cb_internal_data = &r;
734 main_loop.main_loop_run (g);
735 g->launch_done_cb_internal = NULL;
736 g->launch_done_cb_internal_data = NULL;
739 error (g, "guestfs_wait_ready failed, see earlier error messages");
743 /* This is possible in some really strange situations, such as
744 * guestfsd starts up OK but then qemu immediately exits. Check for
745 * it because the caller is probably expecting to be able to send
746 * commands after this function returns.
748 if (g->state != READY) {
749 error (g, "qemu launched and contacted daemon, but state != READY");
757 guestfs_kill_subprocess (guestfs_h *g)
759 if (g->state == CONFIG) {
760 error (g, "no subprocess to kill");
765 fprintf (stderr, "sending SIGTERM to process group %d\n", g->pid);
767 kill (g->pid, SIGTERM);
772 /* This function is called whenever qemu prints something on stdout.
773 * Qemu's stdout is also connected to the guest's serial console, so
774 * we see kernel messages here too.
777 stdout_event (void *data, int watch, int fd, int events)
779 guestfs_h *g = (guestfs_h *) data;
786 "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
787 g, g->state, fd, events);
790 if (g->fd[1] != fd) {
791 error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
795 n = read (fd, buf, sizeof buf);
797 /* Hopefully this indicates the qemu child process has died. */
799 fprintf (stderr, "stdout_event: %p: child process died\n", g);
800 /*kill (g->pid, SIGTERM);*/
801 waitpid (g->pid, NULL, 0);
802 if (g->stdout_watch >= 0)
803 main_loop.remove_handle (g, g->stdout_watch);
804 if (g->sock_watch >= 0)
805 main_loop.remove_handle (g, g->sock_watch);
814 g->stdout_watch = -1;
817 if (g->subprocess_quit_cb)
818 g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
828 /* In verbose mode, copy all log messages to stderr. */
832 /* It's an actual log message, send it upwards if anyone is listening. */
833 if (g->log_message_cb)
834 g->log_message_cb (g, g->log_message_cb_data, buf, n);
837 /* The function is called whenever we can read something on the
838 * guestfsd (daemon inside the guest) communication socket.
841 sock_read_event (void *data, int watch, int fd, int events)
843 guestfs_h *g = (guestfs_h *) data;
850 "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
851 g, g->state, fd, events);
854 error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
858 if (g->msg_in_size <= g->msg_in_allocated) {
859 g->msg_in_allocated += 4096;
860 g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
862 n = read (g->sock, g->msg_in + g->msg_in_size,
863 g->msg_in_allocated - g->msg_in_size);
865 /* Disconnected? Ignore it because stdout_watch will get called
866 * and will do the cleanup.
878 /* Have we got enough of a message to be able to process it yet? */
879 if (g->msg_in_size < 4) return;
881 xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
882 if (!xdr_uint32_t (&xdr, &len)) {
883 error (g, "can't decode length word");
887 /* Length is normally the length of the message, but when guestfsd
888 * starts up it sends a "magic" value (longer than any possible
889 * message). Check for this.
891 if (len == 0xf5f55ff5) {
892 if (g->state != LAUNCHING)
893 error (g, "received magic signature from guestfsd, but in state %d",
895 else if (g->msg_in_size != 4)
896 error (g, "received magic signature from guestfsd, but msg size is %d",
900 if (g->launch_done_cb_internal)
901 g->launch_done_cb_internal (g, g->launch_done_cb_internal_data);
902 if (g->launch_done_cb)
903 g->launch_done_cb (g, g->launch_done_cb_data);
909 /* If this happens, it's pretty bad and we've probably lost synchronization.*/
910 if (len > GUESTFS_MESSAGE_MAX) {
911 error (g, "message length (%u) > maximum possible size (%d)",
912 len, GUESTFS_MESSAGE_MAX);
916 if (g->msg_in_size-4 < len) return; /* Need more of this message. */
918 /* This should not happen, and if it does it probably means we've
919 * lost all hope of synchronization.
921 if (g->msg_in_size-4 > len) {
922 error (g, "len = %d, but msg_in_size-4 = %d", len, g->msg_in_size-4);
926 /* Not in the expected state. */
927 if (g->state != BUSY)
928 error (g, "state %d != BUSY", g->state);
930 /* Push the message up to the higher layer. Note that unlike
931 * launch_done_cb / launch_done_cb_internal, we only call at
932 * most one of the callback functions here.
935 if (g->reply_cb_internal)
936 g->reply_cb_internal (g, g->reply_cb_internal_data, &xdr);
937 else if (g->reply_cb)
938 g->reply_cb (g, g->reply_cb, &xdr);
941 /* Free the message buffer if it's grown excessively large. */
942 if (g->msg_in_allocated > 65536) {
945 g->msg_in_size = g->msg_in_allocated = 0;
952 /* The function is called whenever we can write something on the
953 * guestfsd (daemon inside the guest) communication socket.
956 sock_write_event (void *data, int watch, int fd, int events)
958 guestfs_h *g = (guestfs_h *) data;
963 "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
964 g, g->state, fd, events);
967 error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
971 if (g->state != BUSY) {
972 error (g, "sock_write_event: state %d != BUSY", g->state);
977 fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
978 g->msg_out_size - g->msg_out_pos);
980 n = write (g->sock, g->msg_out + g->msg_out_pos,
981 g->msg_out_size - g->msg_out_pos);
984 perrorf (g, "write");
989 fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
994 if (g->msg_out_pos < g->msg_out_size)
998 fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n");
1001 g->msg_out_pos = g->msg_out_size = 0;
1003 if (main_loop.remove_handle (g, g->sock_watch) == -1) {
1004 error (g, "remove_handle failed in sock_write_event");
1008 main_loop.add_handle (g, g->sock,
1009 GUESTFS_HANDLE_READABLE,
1010 sock_read_event, g);
1011 if (g->sock_watch == -1) {
1012 error (g, "add_handle failed in sock_write_event");
1017 /* Dispatch a call to the remote daemon. This function just queues
1018 * the call in msg_out, to be sent when we next enter the main loop.
1019 * Returns -1 for error, or the message serial number.
1022 dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
1024 char buffer[GUESTFS_MESSAGE_MAX];
1025 struct guestfs_message_header hdr;
1028 int serial = g->msg_next_serial++;
1030 if (g->state != READY) {
1031 error (g, "dispatch: state %d != READY", g->state);
1035 /* Serialize the header. */
1036 hdr.prog = GUESTFS_PROGRAM;
1037 hdr.vers = GUESTFS_PROTOCOL_VERSION;
1039 hdr.direction = GUESTFS_DIRECTION_CALL;
1040 hdr.serial = serial;
1041 hdr.status = GUESTFS_STATUS_OK;
1043 xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
1044 if (!xdr_guestfs_message_header (&xdr, &hdr)) {
1045 error (g, "xdr_guestfs_message_header failed");
1049 /* Serialize the args. If any, because some message types
1050 * have no parameters.
1053 if (!(*xdrp) (&xdr, args)) {
1054 error (g, "dispatch failed to marshal args");
1059 len = xdr_getpos (&xdr);
1062 /* Allocate the outgoing message buffer. */
1063 g->msg_out = safe_malloc (g, len + 4);
1065 g->msg_out_size = len + 4;
1069 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1070 if (!xdr_uint32_t (&xdr, &len)) {
1071 error (g, "xdr_uint32_t failed in dispatch");
1075 memcpy (g->msg_out + 4, buffer, len);
1077 /* Change the handle to sock_write_event. */
1078 if (main_loop.remove_handle (g, g->sock_watch) == -1) {
1079 error (g, "remove_handle failed in dispatch");
1083 main_loop.add_handle (g, g->sock,
1084 GUESTFS_HANDLE_WRITABLE,
1085 sock_write_event, g);
1086 if (g->sock_watch == -1) {
1087 error (g, "add_handle failed in dispatch");
1096 g->msg_out_size = 0;
1101 /* Check the return message from a call for validity. */
1103 check_reply_header (guestfs_h *g,
1104 const struct guestfs_message_header *hdr,
1105 int proc_nr, int serial)
1107 if (hdr->prog != GUESTFS_PROGRAM) {
1108 error (g, "wrong program (%d/%d)", hdr->prog, GUESTFS_PROGRAM);
1111 if (hdr->vers != GUESTFS_PROTOCOL_VERSION) {
1112 error (g, "wrong protocol version (%d/%d)",
1113 hdr->vers, GUESTFS_PROTOCOL_VERSION);
1116 if (hdr->direction != GUESTFS_DIRECTION_REPLY) {
1117 error (g, "unexpected message direction (%d/%d)",
1118 hdr->direction, GUESTFS_DIRECTION_REPLY);
1121 if (hdr->proc != proc_nr) {
1122 error (g, "unexpected procedure number (%d/%d)", hdr->proc, proc_nr);
1125 if (hdr->serial != serial) {
1126 error (g, "unexpected serial (%d/%d)", hdr->serial, serial);
1133 /* The high-level actions are autogenerated by generator.ml. Include
1136 #include "guestfs-actions.c"
1138 /* This is the default main loop implementation, using select(2). */
1140 struct handle_cb_data {
1141 guestfs_handle_event_cb cb;
1148 static int select_init_done = 0;
1149 static int max_fd = -1;
1150 static int nr_fds = 0;
1151 static struct handle_cb_data *handle_cb_data = NULL;
1156 if (!select_init_done) {
1161 select_init_done = 1;
1166 select_add_handle (guestfs_h *g, int fd, int events,
1167 guestfs_handle_event_cb cb, void *data)
1171 if (fd < 0 || fd >= FD_SETSIZE) {
1172 error (g, "fd %d is out of range", fd);
1176 if ((events & ~(GUESTFS_HANDLE_READABLE |
1177 GUESTFS_HANDLE_WRITABLE |
1178 GUESTFS_HANDLE_HANGUP |
1179 GUESTFS_HANDLE_ERROR)) != 0) {
1180 error (g, "set of events (0x%x) contains unknown events", events);
1185 error (g, "set of events is empty");
1189 if (FD_ISSET (fd, &rset) || FD_ISSET (fd, &wset) || FD_ISSET (fd, &xset)) {
1190 error (g, "fd %d is already registered", fd);
1195 error (g, "callback is NULL");
1199 if ((events & GUESTFS_HANDLE_READABLE))
1201 if ((events & GUESTFS_HANDLE_WRITABLE))
1203 if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
1208 handle_cb_data = safe_realloc (g, handle_cb_data,
1209 sizeof (struct handle_cb_data) * (max_fd+1));
1211 handle_cb_data[fd].cb = cb;
1212 handle_cb_data[fd].data = data;
1216 /* Any integer >= 0 can be the handle, and this is as good as any ... */
1221 select_remove_handle (guestfs_h *g, int fd)
1225 if (fd < 0 || fd >= FD_SETSIZE) {
1226 error (g, "fd %d is out of range", fd);
1230 if (!FD_ISSET (fd, &rset) && !FD_ISSET (fd, &wset) && !FD_ISSET (fd, &xset)) {
1231 error (g, "fd %d was not registered", fd);
1241 handle_cb_data = safe_realloc (g, handle_cb_data,
1242 sizeof (struct handle_cb_data) * (max_fd+1));
1251 select_add_timeout (guestfs_h *g, int interval,
1252 guestfs_handle_timeout_cb cb, void *data)
1256 abort (); /* XXX not implemented yet */
1260 select_remove_timeout (guestfs_h *g, int timer)
1264 abort (); /* XXX not implemented yet */
1267 /* Note that main loops can be nested. */
1268 static int level = 0;
1271 select_main_loop_run (guestfs_h *g)
1273 int old_level, fd, r, events;
1274 fd_set rset2, wset2, xset2;
1278 old_level = level++;
1279 while (level > old_level) {
1288 r = select (max_fd+1, &rset2, &wset2, &xset2, NULL);
1290 perrorf (g, "select");
1295 for (fd = 0; r > 0 && fd <= max_fd; ++fd) {
1297 if (FD_ISSET (fd, &rset2))
1298 events |= GUESTFS_HANDLE_READABLE;
1299 if (FD_ISSET (fd, &wset2))
1300 events |= GUESTFS_HANDLE_WRITABLE;
1301 if (FD_ISSET (fd, &xset2))
1302 events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
1305 handle_cb_data[fd].cb (handle_cb_data[fd].data,
1313 select_main_loop_quit (guestfs_h *g)
1318 error (g, "cannot quit, we are not in a main loop");