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. */
167 guestfs_abort_cb abort_cb;
168 guestfs_error_handler_cb error_cb;
169 void * error_cb_data;
170 guestfs_send_cb send_cb;
172 guestfs_reply_cb reply_cb;
173 void * reply_cb_data;
174 guestfs_log_message_cb log_message_cb;
175 void * log_message_cb_data;
176 guestfs_subprocess_quit_cb subprocess_quit_cb;
177 void * subprocess_quit_cb_data;
178 guestfs_launch_done_cb launch_done_cb;
179 void * launch_done_cb_data;
181 /* Main loop used by this handle. */
182 guestfs_main_loop *main_loop;
184 /* Messages sent and received from the daemon. */
186 int msg_in_size, msg_in_allocated;
188 int msg_out_size, msg_out_pos;
193 static guestfs_h *handles = NULL;
194 static int atexit_handler_set = 0;
197 guestfs_create (void)
202 g = malloc (sizeof (*g));
205 memset (g, 0, sizeof (*g));
212 g->stdout_watch = -1;
216 g->error_cb = default_error_cb;
217 g->error_cb_data = NULL;
219 str = getenv ("LIBGUESTFS_DEBUG");
220 g->verbose = str != NULL && strcmp (str, "1") == 0;
222 str = getenv ("LIBGUESTFS_PATH");
223 g->path = str != NULL ? str : GUESTFS_DEFAULT_PATH;
225 str = getenv ("LIBGUESTFS_QEMU");
226 g->qemu = str != NULL ? str : QEMU;
228 g->main_loop = guestfs_get_default_main_loop ();
230 /* Start with large serial numbers so they are easy to spot
231 * inside the protocol.
233 g->msg_next_serial = 0x00123400;
235 /* Link the handles onto a global list. This is the one area
236 * where the library needs to be made thread-safe. (XXX)
238 /* acquire mutex (XXX) */
241 if (!atexit_handler_set) {
242 atexit (close_handles);
243 atexit_handler_set = 1;
245 /* release mutex (XXX) */
248 fprintf (stderr, "new guestfs handle %p\n", g);
254 guestfs_close (guestfs_h *g)
260 if (g->state == NO_HANDLE) {
261 /* Not safe to call 'error' here, so ... */
262 fprintf (stderr, "guestfs_close: called twice on the same handle\n");
267 fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
269 /* Try to sync if autosync flag is set. */
270 if (g->autosync && g->state == READY) {
271 guestfs_umount_all (g);
275 /* Remove any handlers that might be called back before we kill the
278 g->log_message_cb = NULL;
280 if (g->state != CONFIG)
281 guestfs_kill_subprocess (g);
284 snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
293 for (i = 0; i < g->cmdline_size; ++i)
294 free (g->cmdline[i]);
298 /* Mark the handle as dead before freeing it. */
299 g->state = NO_HANDLE;
301 /* acquire mutex (XXX) */
305 for (gg = handles; gg->next != g; gg = gg->next)
309 /* release mutex (XXX) */
311 free (g->last_error);
315 /* Close all open handles (called from atexit(3)). */
319 while (handles) guestfs_close (handles);
323 guestfs_last_error (guestfs_h *g)
325 return g->last_error;
329 set_last_error (guestfs_h *g, const char *msg)
331 free (g->last_error);
332 g->last_error = strdup (msg);
336 default_error_cb (guestfs_h *g, void *data, const char *msg)
338 fprintf (stderr, "libguestfs: error: %s\n", msg);
342 guestfs_error (guestfs_h *g, const char *fs, ...)
348 vasprintf (&msg, fs, args);
351 if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
352 set_last_error (g, msg);
358 guestfs_perrorf (guestfs_h *g, const char *fs, ...)
365 vasprintf (&msg, fs, args);
370 strerror_r (err, buf, sizeof buf);
374 buf = strerror_r (err, _buf, sizeof _buf);
377 msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
381 if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
382 set_last_error (g, msg);
388 guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
390 void *ptr = malloc (nbytes);
391 if (!ptr) g->abort_cb ();
396 guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
398 void *p = realloc (ptr, nbytes);
399 if (!p) g->abort_cb ();
404 guestfs_safe_strdup (guestfs_h *g, const char *str)
406 char *s = strdup (str);
407 if (!s) g->abort_cb ();
412 guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
414 void *p = malloc (size);
415 if (!p) g->abort_cb ();
416 memcpy (p, ptr, size);
421 xwrite (int fd, const void *buf, size_t len)
426 r = write (fd, buf, len);
438 xread (int fd, void *buf, size_t len)
443 r = read (fd, buf, len);
445 if (errno == EINTR || errno == EAGAIN)
458 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
464 guestfs_get_out_of_memory_handler (guestfs_h *g)
470 guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
473 g->error_cb_data = data;
476 guestfs_error_handler_cb
477 guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
479 if (data_rtn) *data_rtn = g->error_cb_data;
484 guestfs_set_verbose (guestfs_h *g, int v)
491 guestfs_get_verbose (guestfs_h *g)
497 guestfs_set_autosync (guestfs_h *g, int a)
504 guestfs_get_autosync (guestfs_h *g)
510 guestfs_set_path (guestfs_h *g, const char *path)
513 g->path = GUESTFS_DEFAULT_PATH;
520 guestfs_get_path (guestfs_h *g)
526 guestfs_set_qemu (guestfs_h *g, const char *qemu)
536 guestfs_get_qemu (guestfs_h *g)
541 /* Add a string to the current command line. */
543 incr_cmdline_size (guestfs_h *g)
545 if (g->cmdline == NULL) {
546 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
548 g->cmdline = safe_malloc (g, sizeof (char *));
549 g->cmdline[0] = NULL;
553 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
557 add_cmdline (guestfs_h *g, const char *str)
559 if (g->state != CONFIG) {
560 error (g, "command line cannot be altered after qemu subprocess launched");
564 incr_cmdline_size (g);
565 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
570 guestfs_config (guestfs_h *g,
571 const char *qemu_param, const char *qemu_value)
573 if (qemu_param[0] != '-') {
574 error (g, "guestfs_config: parameter must begin with '-' character");
578 /* A bit fascist, but the user will probably break the extra
579 * parameters that we add if they try to set any of these.
581 if (strcmp (qemu_param, "-kernel") == 0 ||
582 strcmp (qemu_param, "-initrd") == 0 ||
583 strcmp (qemu_param, "-nographic") == 0 ||
584 strcmp (qemu_param, "-serial") == 0 ||
585 strcmp (qemu_param, "-vnc") == 0 ||
586 strcmp (qemu_param, "-full-screen") == 0 ||
587 strcmp (qemu_param, "-std-vga") == 0 ||
588 strcmp (qemu_param, "-vnc") == 0) {
589 error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
593 if (add_cmdline (g, qemu_param) != 0) return -1;
595 if (qemu_value != NULL) {
596 if (add_cmdline (g, qemu_value) != 0) return -1;
603 guestfs_add_drive (guestfs_h *g, const char *filename)
605 size_t len = strlen (filename) + 64;
608 if (strchr (filename, ',') != NULL) {
609 error (g, "filename cannot contain ',' (comma) character");
613 if (access (filename, F_OK) == -1) {
614 perrorf (g, "%s", filename);
618 snprintf (buf, len, "file=%s", filename);
620 return guestfs_config (g, "-drive", buf);
624 guestfs_add_cdrom (guestfs_h *g, const char *filename)
626 if (strchr (filename, ',') != NULL) {
627 error (g, "filename cannot contain ',' (comma) character");
631 if (access (filename, F_OK) == -1) {
632 perrorf (g, "%s", filename);
636 return guestfs_config (g, "-cdrom", filename);
640 guestfs_launch (guestfs_h *g)
642 static const char *dir_template = "/tmp/libguestfsXXXXXX";
643 int r, i, pmore, memsize;
647 const char *kernel_name = "vmlinuz." REPO "." host_cpu;
648 const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
649 char *path, *pelem, *pend;
650 char *kernel = NULL, *initrd = NULL;
652 struct sockaddr_un addr;
656 error (g, "you must call guestfs_add_drive before guestfs_launch");
660 if (g->state != CONFIG) {
661 error (g, "qemu has already been launched");
665 /* Search g->path for the kernel and initrd. */
666 pelem = path = safe_strdup (g, g->path);
668 pend = strchrnul (pelem, ':');
669 pmore = *pend == ':';
673 /* Empty element or "." means cwd. */
674 if (len == 0 || (len == 1 && *pelem == '.')) {
677 "looking for kernel and initrd in current directory\n");
678 if (access (kernel_name, F_OK) == 0 && access (initrd_name, F_OK) == 0) {
679 kernel = safe_strdup (g, kernel_name);
680 initrd = safe_strdup (g, initrd_name);
684 /* Look at <path>/kernel etc. */
686 kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
687 initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
688 sprintf (kernel, "%s/%s", pelem, kernel_name);
689 sprintf (initrd, "%s/%s", pelem, initrd_name);
692 fprintf (stderr, "looking for %s and %s\n", kernel, initrd);
694 if (access (kernel, F_OK) == 0 && access (initrd, F_OK) == 0)
698 kernel = initrd = NULL;
706 if (kernel == NULL || initrd == NULL) {
707 error (g, "cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)",
708 kernel_name, initrd_name, g->path);
712 /* Choose a suitable memory size. Previously we tried to choose
713 * a minimal memory size, but this isn't really necessary since
714 * recent QEMU and KVM don't do anything nasty like locking
715 * memory into core any more. This we can safely choose a
716 * large, generous amount of memory, and it'll just get swapped
717 * on smaller systems.
721 /* Make the temporary directory containing the socket. */
723 g->tmpdir = safe_strdup (g, dir_template);
724 if (mkdtemp (g->tmpdir) == NULL) {
725 perrorf (g, "%s: cannot create temporary directory", dir_template);
730 snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
733 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
748 if (r == 0) { /* Child (qemu). */
751 char memsize_str[256];
753 /* Set up the full command line. Do this in the subprocess so we
754 * don't need to worry about cleaning up.
756 g->cmdline[0] = (char *) g->qemu;
758 /* Construct the -net channel parameter for qemu. */
759 snprintf (vmchannel, sizeof vmchannel,
760 "channel,%d:unix:%s,server,nowait",
761 VMCHANNEL_PORT, unixsock);
763 /* Linux kernel command line. */
764 snprintf (append, sizeof append,
765 "panic=1 console=ttyS0 guestfs=%s:%d%s",
766 VMCHANNEL_ADDR, VMCHANNEL_PORT,
767 g->verbose ? " guestfs_verbose=1" : "");
769 snprintf (memsize_str, sizeof memsize_str, "%d", memsize);
771 add_cmdline (g, "-m");
772 add_cmdline (g, memsize_str);
774 add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
776 add_cmdline (g, "-no-reboot"); /* Force exit instead of reboot on panic */
777 add_cmdline (g, "-kernel");
778 add_cmdline (g, (char *) kernel);
779 add_cmdline (g, "-initrd");
780 add_cmdline (g, (char *) initrd);
781 add_cmdline (g, "-append");
782 add_cmdline (g, append);
783 add_cmdline (g, "-nographic");
784 add_cmdline (g, "-serial");
785 add_cmdline (g, "stdio");
786 add_cmdline (g, "-net");
787 add_cmdline (g, vmchannel);
788 add_cmdline (g, "-net");
789 add_cmdline (g, "user,vlan=0");
790 add_cmdline (g, "-net");
791 add_cmdline (g, "nic,model=virtio,vlan=0");
792 incr_cmdline_size (g);
793 g->cmdline[g->cmdline_size-1] = NULL;
796 fprintf (stderr, "%s", g->qemu);
797 for (i = 0; g->cmdline[i]; ++i)
798 fprintf (stderr, " %s", g->cmdline[i]);
799 fprintf (stderr, "\n");
802 /* Set up stdin, stdout. */
813 /* Set up a new process group, so we can signal this process
814 * and all subprocesses (eg. if qemu is really a shell script).
819 execv (g->qemu, g->cmdline); /* Run qemu. */
824 /* Parent (library). */
827 /* Fork the recovery process off which will kill qemu if the parent
828 * process fails to do so (eg. if the parent segfaults).
832 pid_t qemu_pid = g->pid;
833 pid_t parent_pid = getppid ();
835 /* Writing to argv is hideously complicated and error prone. See:
836 * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
839 /* Loop around waiting for one or both of the other processes to
840 * disappear. It's fair to say this is very hairy. The PIDs that
841 * we are looking at might be reused by another process. We are
842 * effectively polling. Is the cure worse than the disease?
845 if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
847 if (kill (parent_pid, 0) == -1) {
848 /* Parent's gone away, qemu still around, so kill qemu. */
856 /* Don't worry, if the fork failed, this will be -1. The recovery
857 * process isn't essential.
861 /* Start the clock ... */
864 /* Close the other ends of the pipe. */
868 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
869 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
870 perrorf (g, "fcntl");
874 g->fd[0] = wfd[1]; /* stdin of child */
875 g->fd[1] = rfd[0]; /* stdout of child */
877 /* Open the Unix socket. The vmchannel implementation that got
878 * merged with qemu sucks in a number of ways. Both ends do
879 * connect(2), which means that no one knows what, if anything, is
880 * connected to the other end, or if it becomes disconnected. Even
881 * worse, we have to wait some indeterminate time for qemu to create
882 * the socket and connect to it (which happens very early in qemu's
883 * start-up), so any code that uses vmchannel is inherently racy.
884 * Hence this silly loop.
886 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
888 perrorf (g, "socket");
892 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
893 perrorf (g, "fcntl");
897 addr.sun_family = AF_UNIX;
898 strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
899 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
903 /* Always sleep at least once to give qemu a small chance to start up. */
906 r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
907 if ((r == -1 && errno == EINPROGRESS) || r == 0)
911 perrorf (g, "connect");
915 error (g, "failed to connect to vmchannel socket");
919 /* Watch the file descriptors. */
922 g->msg_in_size = g->msg_in_allocated = 0;
930 g->main_loop->add_handle (g->main_loop, g, g->fd[1],
931 GUESTFS_HANDLE_READABLE,
933 if (g->stdout_watch == -1) {
934 error (g, "could not watch qemu stdout");
938 if (guestfs__switch_to_receiving (g) == -1)
941 g->state = LAUNCHING;
945 if (g->stdout_watch >= 0)
946 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
947 if (g->sock_watch >= 0)
948 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
957 if (g->recoverypid > 0) kill (g->recoverypid, 9);
958 waitpid (g->pid, NULL, 0);
959 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
966 g->stdout_watch = -1;
976 finish_wait_ready (guestfs_h *g, void *vp)
979 fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
982 g->main_loop->main_loop_quit (g->main_loop, g);
986 guestfs_wait_ready (guestfs_h *g)
990 if (g->state == READY) return 0;
992 if (g->state == BUSY) {
993 error (g, "qemu has finished launching already");
997 if (g->state != LAUNCHING) {
998 error (g, "qemu has not been launched yet");
1002 g->launch_done_cb = finish_wait_ready;
1003 g->launch_done_cb_data = &finished;
1004 r = g->main_loop->main_loop_run (g->main_loop, g);
1005 g->launch_done_cb = NULL;
1006 g->launch_done_cb_data = NULL;
1008 if (r == -1) return -1;
1010 if (finished != 1) {
1011 error (g, "guestfs_wait_ready failed, see earlier error messages");
1015 /* This is possible in some really strange situations, such as
1016 * guestfsd starts up OK but then qemu immediately exits. Check for
1017 * it because the caller is probably expecting to be able to send
1018 * commands after this function returns.
1020 if (g->state != READY) {
1021 error (g, "qemu launched and contacted daemon, but state != READY");
1029 guestfs_kill_subprocess (guestfs_h *g)
1031 if (g->state == CONFIG) {
1032 error (g, "no subprocess to kill");
1037 fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
1039 kill (g->pid, SIGTERM);
1040 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1045 /* Access current state. */
1047 guestfs_is_config (guestfs_h *g)
1049 return g->state == CONFIG;
1053 guestfs_is_launching (guestfs_h *g)
1055 return g->state == LAUNCHING;
1059 guestfs_is_ready (guestfs_h *g)
1061 return g->state == READY;
1065 guestfs_is_busy (guestfs_h *g)
1067 return g->state == BUSY;
1071 guestfs_get_state (guestfs_h *g)
1077 guestfs_set_ready (guestfs_h *g)
1079 if (g->state != BUSY) {
1080 error (g, "guestfs_set_ready: called when in state %d != BUSY", g->state);
1088 guestfs_set_busy (guestfs_h *g)
1090 if (g->state != READY) {
1091 error (g, "guestfs_set_busy: called when in state %d != READY", g->state);
1098 /* Structure-freeing functions. These rely on the fact that the
1099 * structure format is identical to the XDR format. See note in
1103 guestfs_free_int_bool (struct guestfs_int_bool *x)
1109 guestfs_free_lvm_pv_list (struct guestfs_lvm_pv_list *x)
1111 xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_pv_list, (char *) x);
1116 guestfs_free_lvm_vg_list (struct guestfs_lvm_vg_list *x)
1118 xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_vg_list, (char *) x);
1123 guestfs_free_lvm_lv_list (struct guestfs_lvm_lv_list *x)
1125 xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_lv_list, (char *) x);
1129 /* This function is called whenever qemu prints something on stdout.
1130 * Qemu's stdout is also connected to the guest's serial console, so
1131 * we see kernel messages here too.
1134 stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1135 int watch, int fd, int events)
1143 "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1144 g, g->state, fd, events);
1147 if (g->fd[1] != fd) {
1148 error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
1152 n = read (fd, buf, sizeof buf);
1154 /* Hopefully this indicates the qemu child process has died. */
1156 fprintf (stderr, "stdout_event: %p: child process died\n", g);
1157 /*kill (g->pid, SIGTERM);*/
1158 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1159 waitpid (g->pid, NULL, 0);
1160 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
1161 if (g->stdout_watch >= 0)
1162 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
1163 if (g->sock_watch >= 0)
1164 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
1174 g->stdout_watch = -1;
1177 if (g->subprocess_quit_cb)
1178 g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
1183 if (errno != EINTR && errno != EAGAIN)
1184 perrorf (g, "read");
1188 /* In verbose mode, copy all log messages to stderr. */
1192 /* It's an actual log message, send it upwards if anyone is listening. */
1193 if (g->log_message_cb)
1194 g->log_message_cb (g, g->log_message_cb_data, buf, n);
1197 /* The function is called whenever we can read something on the
1198 * guestfsd (daemon inside the guest) communication socket.
1201 sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1202 int watch, int fd, int events)
1210 "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1211 g, g->state, fd, events);
1213 if (g->sock != fd) {
1214 error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
1218 if (g->msg_in_size <= g->msg_in_allocated) {
1219 g->msg_in_allocated += 4096;
1220 g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
1222 n = read (g->sock, g->msg_in + g->msg_in_size,
1223 g->msg_in_allocated - g->msg_in_size);
1225 /* Disconnected? Ignore it because stdout_watch will get called
1226 * and will do the cleanup.
1231 if (errno != EINTR && errno != EAGAIN)
1232 perrorf (g, "read");
1236 g->msg_in_size += n;
1238 /* Have we got enough of a message to be able to process it yet? */
1240 if (g->msg_in_size < 4) return;
1242 xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
1243 if (!xdr_uint32_t (&xdr, &len)) {
1244 error (g, "can't decode length word");
1248 /* Length is normally the length of the message, but when guestfsd
1249 * starts up it sends a "magic" value (longer than any possible
1250 * message). Check for this.
1252 if (len == GUESTFS_LAUNCH_FLAG) {
1253 if (g->state != LAUNCHING)
1254 error (g, "received magic signature from guestfsd, but in state %d",
1256 else if (g->msg_in_size != 4)
1257 error (g, "received magic signature from guestfsd, but msg size is %d",
1261 if (g->launch_done_cb)
1262 g->launch_done_cb (g, g->launch_done_cb_data);
1268 /* This can happen if a cancellation happens right at the end
1269 * of us sending a FileIn parameter to the daemon. Discard. The
1270 * daemon should send us an error message next.
1272 if (len == GUESTFS_CANCEL_FLAG) {
1273 g->msg_in_size -= 4;
1274 memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
1278 /* If this happens, it's pretty bad and we've probably lost
1281 if (len > GUESTFS_MESSAGE_MAX) {
1282 error (g, "message length (%u) > maximum possible size (%d)",
1283 len, GUESTFS_MESSAGE_MAX);
1287 if (g->msg_in_size-4 < len) return; /* Need more of this message. */
1289 /* Got the full message, begin processing it. */
1294 for (i = 0; i < g->msg_in_size; i += 16) {
1295 printf ("%04x: ", i);
1296 for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
1297 printf ("%02x ", (unsigned char) g->msg_in[j]);
1298 for (; j < i+16; ++j)
1301 for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
1302 if (isprint (g->msg_in[j]))
1303 printf ("%c", g->msg_in[j]);
1306 for (; j < i+16; ++j)
1313 /* Not in the expected state. */
1314 if (g->state != BUSY)
1315 error (g, "state %d != BUSY", g->state);
1317 /* Push the message up to the higher layer. */
1319 g->reply_cb (g, g->reply_cb_data, &xdr);
1321 /* This message (probably) should never be printed. */
1322 fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
1324 g->msg_in_size -= len + 4;
1325 memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
1326 if (g->msg_in_size > 0) goto again;
1329 /* Free the message buffer if it's grown excessively large. */
1330 if (g->msg_in_allocated > 65536) {
1333 g->msg_in_size = g->msg_in_allocated = 0;
1340 /* The function is called whenever we can write something on the
1341 * guestfsd (daemon inside the guest) communication socket.
1344 sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1345 int watch, int fd, int events)
1351 "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1352 g, g->state, fd, events);
1354 if (g->sock != fd) {
1355 error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
1359 if (g->state != BUSY) {
1360 error (g, "sock_write_event: state %d != BUSY", g->state);
1365 fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
1366 g->msg_out_size - g->msg_out_pos);
1368 n = write (g->sock, g->msg_out + g->msg_out_pos,
1369 g->msg_out_size - g->msg_out_pos);
1371 if (errno != EAGAIN)
1372 perrorf (g, "write");
1377 fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
1379 g->msg_out_pos += n;
1381 /* More to write? */
1382 if (g->msg_out_pos < g->msg_out_size)
1386 fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
1390 g->msg_out_pos = g->msg_out_size = 0;
1392 /* Done writing, call the higher layer. */
1394 g->send_cb (g, g->send_cb_data);
1398 guestfs_set_send_callback (guestfs_h *g,
1399 guestfs_send_cb cb, void *opaque)
1402 g->send_cb_data = opaque;
1406 guestfs_set_reply_callback (guestfs_h *g,
1407 guestfs_reply_cb cb, void *opaque)
1410 g->reply_cb_data = opaque;
1414 guestfs_set_log_message_callback (guestfs_h *g,
1415 guestfs_log_message_cb cb, void *opaque)
1417 g->log_message_cb = cb;
1418 g->log_message_cb_data = opaque;
1422 guestfs_set_subprocess_quit_callback (guestfs_h *g,
1423 guestfs_subprocess_quit_cb cb, void *opaque)
1425 g->subprocess_quit_cb = cb;
1426 g->subprocess_quit_cb_data = opaque;
1430 guestfs_set_launch_done_callback (guestfs_h *g,
1431 guestfs_launch_done_cb cb, void *opaque)
1433 g->launch_done_cb = cb;
1434 g->launch_done_cb_data = opaque;
1437 /* Access to the handle's main loop and the default main loop. */
1439 guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
1441 g->main_loop = main_loop;
1445 guestfs_get_main_loop (guestfs_h *g)
1447 return g->main_loop;
1451 guestfs_get_default_main_loop (void)
1453 return (guestfs_main_loop *) &default_main_loop;
1456 /* Change the daemon socket handler so that we are now writing.
1457 * This sets the handle to sock_write_event.
1460 guestfs__switch_to_sending (guestfs_h *g)
1462 if (g->sock_watch >= 0) {
1463 if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
1464 error (g, "remove_handle failed");
1471 g->main_loop->add_handle (g->main_loop, g, g->sock,
1472 GUESTFS_HANDLE_WRITABLE,
1473 sock_write_event, NULL);
1474 if (g->sock_watch == -1) {
1475 error (g, "add_handle failed");
1483 guestfs__switch_to_receiving (guestfs_h *g)
1485 if (g->sock_watch >= 0) {
1486 if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
1487 error (g, "remove_handle failed");
1494 g->main_loop->add_handle (g->main_loop, g, g->sock,
1495 GUESTFS_HANDLE_READABLE,
1496 sock_read_event, NULL);
1497 if (g->sock_watch == -1) {
1498 error (g, "add_handle failed");
1505 /* Dispatch a call (len + header + args) to the remote daemon,
1506 * synchronously (ie. using the guest's main loop to wait until
1507 * it has been sent). Returns -1 for error, or the serial
1508 * number of the message.
1511 send_cb (guestfs_h *g, void *data)
1513 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1516 ml->main_loop_quit (ml, g);
1520 guestfs__send_sync (guestfs_h *g, int proc_nr,
1521 xdrproc_t xdrp, char *args)
1523 struct guestfs_message_header hdr;
1526 int serial = g->msg_next_serial++;
1528 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1530 if (g->state != BUSY) {
1531 error (g, "guestfs__send_sync: state %d != BUSY", g->state);
1535 /* This is probably an internal error. Or perhaps we should just
1536 * free the buffer anyway?
1538 if (g->msg_out != NULL) {
1539 error (g, "guestfs__send_sync: msg_out should be NULL");
1543 /* We have to allocate this message buffer on the heap because
1544 * it is quite large (although will be mostly unused). We
1545 * can't allocate it on the stack because in some environments
1546 * we have quite limited stack space available, notably when
1547 * running in the JVM.
1549 g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
1550 xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
1552 /* Serialize the header. */
1553 hdr.prog = GUESTFS_PROGRAM;
1554 hdr.vers = GUESTFS_PROTOCOL_VERSION;
1556 hdr.direction = GUESTFS_DIRECTION_CALL;
1557 hdr.serial = serial;
1558 hdr.status = GUESTFS_STATUS_OK;
1560 if (!xdr_guestfs_message_header (&xdr, &hdr)) {
1561 error (g, "xdr_guestfs_message_header failed");
1565 /* Serialize the args. If any, because some message types
1566 * have no parameters.
1569 if (!(*xdrp) (&xdr, args)) {
1570 error (g, "dispatch failed to marshal args");
1575 /* Get the actual length of the message, resize the buffer to match
1576 * the actual length, and write the length word at the beginning.
1578 len = xdr_getpos (&xdr);
1581 g->msg_out = safe_realloc (g, g->msg_out, len + 4);
1582 g->msg_out_size = len + 4;
1585 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1586 xdr_uint32_t (&xdr, &len);
1588 if (guestfs__switch_to_sending (g) == -1)
1592 guestfs_set_send_callback (g, send_cb, &sent);
1593 if (ml->main_loop_run (ml, g) == -1)
1596 error (g, "send failed, see earlier error messages");
1605 g->msg_out_size = 0;
1609 static int cancel = 0; /* XXX Implement file cancellation. */
1610 static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
1611 static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
1612 static int send_file_cancellation_sync (guestfs_h *g);
1613 static int send_file_complete_sync (guestfs_h *g);
1615 /* Synchronously send a file.
1619 * -2 daemon cancelled (we must read the error message)
1622 guestfs__send_file_sync (guestfs_h *g, const char *filename)
1624 char buf[GUESTFS_MAX_CHUNK_SIZE];
1627 fd = open (filename, O_RDONLY);
1629 perrorf (g, "open: %s", filename);
1630 send_file_cancellation_sync (g);
1631 /* Daemon sees cancellation and won't reply, so caller can
1637 /* Send file in chunked encoding. */
1639 r = read (fd, buf, sizeof buf);
1640 if (r == -1 && (errno == EINTR || errno == EAGAIN))
1643 err = send_file_data_sync (g, buf, r);
1645 if (err == -2) /* daemon sent cancellation */
1646 send_file_cancellation_sync (g);
1651 if (cancel) { /* cancel from either end */
1652 send_file_cancellation_sync (g);
1657 perrorf (g, "read: %s", filename);
1658 send_file_cancellation_sync (g);
1662 /* End of file, but before we send that, we need to close
1663 * the file and check for errors.
1665 if (close (fd) == -1) {
1666 perrorf (g, "close: %s", filename);
1667 send_file_cancellation_sync (g);
1671 return send_file_complete_sync (g);
1674 /* Send a chunk of file data. */
1676 send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
1678 return send_file_chunk_sync (g, 0, buf, len);
1681 /* Send a cancellation message. */
1683 send_file_cancellation_sync (guestfs_h *g)
1685 return send_file_chunk_sync (g, 1, NULL, 0);
1688 /* Send a file complete chunk. */
1690 send_file_complete_sync (guestfs_h *g)
1693 return send_file_chunk_sync (g, 0, buf, 0);
1696 /* Send a chunk, cancellation or end of file, synchronously (ie. wait
1699 static int check_for_daemon_cancellation (guestfs_h *g);
1702 send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
1706 guestfs_chunk chunk;
1708 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1710 if (g->state != BUSY) {
1711 error (g, "send_file_chunk_sync: state %d != READY", g->state);
1715 /* This is probably an internal error. Or perhaps we should just
1716 * free the buffer anyway?
1718 if (g->msg_out != NULL) {
1719 error (g, "guestfs__send_sync: msg_out should be NULL");
1723 /* Did the daemon send a cancellation message? */
1724 if (check_for_daemon_cancellation (g)) {
1726 fprintf (stderr, "got daemon cancellation\n");
1730 /* Allocate the chunk buffer. Don't use the stack to avoid
1731 * excessive stack usage and unnecessary copies.
1733 g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
1734 xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
1736 /* Serialize the chunk. */
1737 chunk.cancel = cancel;
1738 chunk.data.data_len = buflen;
1739 chunk.data.data_val = (char *) buf;
1741 if (!xdr_guestfs_chunk (&xdr, &chunk)) {
1742 error (g, "xdr_guestfs_chunk failed (buf = %p, buflen = %zu)",
1748 len = xdr_getpos (&xdr);
1751 /* Reduce the size of the outgoing message buffer to the real length. */
1752 g->msg_out = safe_realloc (g, g->msg_out, len + 4);
1753 g->msg_out_size = len + 4;
1756 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1757 xdr_uint32_t (&xdr, &len);
1759 if (guestfs__switch_to_sending (g) == -1)
1763 guestfs_set_send_callback (g, send_cb, &sent);
1764 if (ml->main_loop_run (ml, g) == -1)
1767 error (g, "send file chunk failed, see earlier error messages");
1776 g->msg_out_size = 0;
1780 /* At this point we are sending FileIn file(s) to the guest, and not
1781 * expecting to read anything, so if we do read anything, it must be
1782 * a cancellation message. This checks for this case without blocking.
1785 check_for_daemon_cancellation (guestfs_h *g)
1795 FD_SET (g->sock, &rset);
1798 r = select (g->sock+1, &rset, NULL, NULL, &tv);
1800 perrorf (g, "select");
1806 /* Read the message from the daemon. */
1807 r = xread (g->sock, buf, sizeof buf);
1809 perrorf (g, "read");
1813 xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
1814 xdr_uint32_t (&xdr, &flag);
1817 if (flag != GUESTFS_CANCEL_FLAG) {
1818 error (g, "check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n",
1819 flag, GUESTFS_CANCEL_FLAG);
1826 /* Synchronously receive a file. */
1828 /* Returns -1 = error, 0 = EOF, 1 = more data */
1829 static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
1832 guestfs__receive_file_sync (guestfs_h *g, const char *filename)
1838 fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
1840 perrorf (g, "open: %s", filename);
1844 /* Receive the file in chunked encoding. */
1845 while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
1846 if (xwrite (fd, buf, len) == -1) {
1847 perrorf (g, "%s: write", filename);
1852 if (r == 0) break; /* End of file. */
1856 error (g, "%s: error in chunked encoding", filename);
1860 if (close (fd) == -1) {
1861 perrorf (g, "close: %s", filename);
1868 /* Send cancellation message to daemon, then wait until it
1869 * cancels (just throwing away data).
1873 uint32_t flag = GUESTFS_CANCEL_FLAG;
1875 xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
1876 xdr_uint32_t (&xdr, &flag);
1879 if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
1880 perrorf (g, "write to daemon socket");
1884 while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
1885 ; /* just discard it */
1890 /* Note that the reply callback can be called multiple times before
1891 * the main loop quits and we get back to the synchronous code. So
1892 * we have to be prepared to save multiple chunks on a list here.
1894 struct receive_file_ctx {
1895 int count; /* 0 if receive_file_cb not called, or
1896 * else count number of chunks.
1898 guestfs_chunk *chunks; /* Array of chunks. */
1902 free_chunks (struct receive_file_ctx *ctx)
1906 for (i = 0; i < ctx->count; ++i)
1907 free (ctx->chunks[i].data.data_val);
1913 receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
1915 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1916 struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
1917 guestfs_chunk chunk;
1919 if (ctx->count == -1) /* Parse error occurred previously. */
1922 ml->main_loop_quit (ml, g);
1924 memset (&chunk, 0, sizeof chunk);
1926 if (!xdr_guestfs_chunk (xdr, &chunk)) {
1927 error (g, "failed to parse file chunk");
1934 /* Copy the chunk to the list. */
1935 ctx->chunks = safe_realloc (g, ctx->chunks,
1936 sizeof (guestfs_chunk) * (ctx->count+1));
1937 ctx->chunks[ctx->count] = chunk;
1941 /* Receive a chunk of file data. */
1942 /* Returns -1 = error, 0 = EOF, 1 = more data */
1944 receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
1946 struct receive_file_ctx ctx;
1947 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1954 guestfs_set_reply_callback (g, receive_file_cb, &ctx);
1955 (void) ml->main_loop_run (ml, g);
1956 guestfs_set_reply_callback (g, NULL, NULL);
1958 if (ctx.count == 0) {
1959 error (g, "receive_file_data_sync: reply callback not called\n");
1963 if (ctx.count == -1) {
1964 error (g, "receive_file_data_sync: parse error in reply callback\n");
1965 /* callback already freed the chunks */
1970 fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
1972 /* Process each chunk in the list. */
1973 if (buf) *buf = NULL; /* Accumulate data in this buffer. */
1976 for (i = 0; i < ctx.count; ++i) {
1977 if (ctx.chunks[i].cancel) {
1978 error (g, "file receive cancelled by daemon");
1980 if (buf) free (*buf);
1981 if (len_r) *len_r = 0;
1985 if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
1987 if (len_r) *len_r = len;
1992 *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
1993 memcpy (*buf+len, ctx.chunks[i].data.data_val,
1994 ctx.chunks[i].data.data_len);
1996 len += ctx.chunks[i].data.data_len;
1999 if (len_r) *len_r = len;
2004 /* This is the default main loop implementation, using select(2). */
2007 select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
2008 guestfs_handle_event_cb cb, void *data)
2010 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2012 if (fd < 0 || fd >= FD_SETSIZE) {
2013 error (g, "fd %d is out of range", fd);
2017 if ((events & ~(GUESTFS_HANDLE_READABLE |
2018 GUESTFS_HANDLE_WRITABLE |
2019 GUESTFS_HANDLE_HANGUP |
2020 GUESTFS_HANDLE_ERROR)) != 0) {
2021 error (g, "set of events (0x%x) contains unknown events", events);
2026 error (g, "set of events is empty");
2030 if (FD_ISSET (fd, &ml->rset) ||
2031 FD_ISSET (fd, &ml->wset) ||
2032 FD_ISSET (fd, &ml->xset)) {
2033 error (g, "fd %d is already registered", fd);
2038 error (g, "callback is NULL");
2042 if ((events & GUESTFS_HANDLE_READABLE))
2043 FD_SET (fd, &ml->rset);
2044 if ((events & GUESTFS_HANDLE_WRITABLE))
2045 FD_SET (fd, &ml->wset);
2046 if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
2047 FD_SET (fd, &ml->xset);
2049 if (fd > ml->max_fd) {
2051 ml->handle_cb_data =
2052 safe_realloc (g, ml->handle_cb_data,
2053 sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
2055 ml->handle_cb_data[fd].cb = cb;
2056 ml->handle_cb_data[fd].g = g;
2057 ml->handle_cb_data[fd].data = data;
2061 /* Any integer >= 0 can be the handle, and this is as good as any ... */
2066 select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
2068 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2070 if (fd < 0 || fd >= FD_SETSIZE) {
2071 error (g, "fd %d is out of range", fd);
2075 if (!FD_ISSET (fd, &ml->rset) &&
2076 !FD_ISSET (fd, &ml->wset) &&
2077 !FD_ISSET (fd, &ml->xset)) {
2078 error (g, "fd %d was not registered", fd);
2082 FD_CLR (fd, &ml->rset);
2083 FD_CLR (fd, &ml->wset);
2084 FD_CLR (fd, &ml->xset);
2086 if (fd == ml->max_fd) {
2088 ml->handle_cb_data =
2089 safe_realloc (g, ml->handle_cb_data,
2090 sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
2099 select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
2100 guestfs_handle_timeout_cb cb, void *data)
2102 //struct select_main_loop *ml = (struct select_main_loop *) mlv;
2104 abort (); /* XXX not implemented yet */
2108 select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
2110 //struct select_main_loop *ml = (struct select_main_loop *) mlv;
2112 abort (); /* XXX not implemented yet */
2115 /* The 'g' parameter is just used for error reporting. Events
2116 * for multiple handles can be dispatched by running the main
2120 select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
2122 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2124 fd_set rset2, wset2, xset2;
2126 if (ml->is_running) {
2127 error (g, "select_main_loop_run: this cannot be called recursively");
2133 while (ml->is_running) {
2134 if (ml->nr_fds == 0)
2140 r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
2142 perrorf (g, "select");
2147 for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
2149 if (FD_ISSET (fd, &rset2))
2150 events |= GUESTFS_HANDLE_READABLE;
2151 if (FD_ISSET (fd, &wset2))
2152 events |= GUESTFS_HANDLE_WRITABLE;
2153 if (FD_ISSET (fd, &xset2))
2154 events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
2157 ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
2158 ml->handle_cb_data[fd].g,
2159 ml->handle_cb_data[fd].data,
2170 select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
2172 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2174 /* Note that legitimately ml->is_running can be zero when
2175 * this function is called.