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 int select_add_handle (guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
71 static int select_remove_handle (guestfs_h *g, int watch);
72 static int select_add_timeout (guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
73 static int select_remove_timeout (guestfs_h *g, int timer);
74 static void select_main_loop_run (guestfs_h *g);
75 static void select_main_loop_quit (guestfs_h *g);
77 #define UNIX_PATH_MAX 108
79 /* Also in guestfsd.c */
80 #define VMCHANNEL_PORT 6666
81 #define VMCHANNEL_ADDR "10.0.2.4"
83 /* Current main loop. */
84 static guestfs_main_loop main_loop = {
85 .add_handle = select_add_handle,
86 .remove_handle = select_remove_handle,
87 .add_timeout = select_add_timeout,
88 .remove_timeout = select_remove_timeout,
89 .main_loop_run = select_main_loop_run,
90 .main_loop_quit = select_main_loop_quit,
93 /* GuestFS handle and connection. */
94 enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
98 /* State: see the state machine diagram in the man page guestfs(3). */
101 int fd[2]; /* Stdin/stdout of qemu. */
102 int sock; /* Daemon communications socket. */
103 int pid; /* Qemu PID. */
104 time_t start_t; /* The time when we started qemu. */
106 int stdout_watch; /* Watches qemu stdout for log messages. */
107 int sock_watch; /* Watches daemon comm socket. */
109 char *tmpdir; /* Temporary directory containing socket. */
111 char **cmdline; /* Qemu command line. */
117 guestfs_abort_cb abort_cb;
118 guestfs_error_handler_cb error_cb;
119 void * error_cb_data;
120 guestfs_reply_cb reply_cb;
121 void * reply_cb_data;
122 guestfs_log_message_cb log_message_cb;
123 void * log_message_cb_data;
124 guestfs_subprocess_quit_cb subprocess_quit_cb;
125 void * subprocess_quit_cb_data;
126 guestfs_launch_done_cb launch_done_cb;
127 void * launch_done_cb_data;
129 /* These callbacks are called before reply_cb and launch_done_cb,
130 * and are used to implement the high-level API without needing to
131 * interfere with callbacks that the user might have set.
133 guestfs_reply_cb reply_cb_internal;
134 void * reply_cb_internal_data;
135 guestfs_launch_done_cb launch_done_cb_internal;
136 void * launch_done_cb_internal_data;
138 /* Messages sent and received from the daemon. */
140 int msg_in_size, msg_in_allocated;
142 int msg_out_size, msg_out_pos;
148 guestfs_create (void)
153 g = malloc (sizeof (*g));
156 memset (g, 0, sizeof (*g));
163 g->stdout_watch = -1;
167 g->error_cb = default_error_cb;
168 g->error_cb_data = NULL;
170 str = getenv ("LIBGUESTFS_DEBUG");
171 g->verbose = str != NULL && strcmp (str, "1") == 0;
177 guestfs_close (guestfs_h *g)
182 if (g->state == NO_HANDLE) {
183 /* Not safe to call 'error' here, so ... */
184 fprintf (stderr, "guestfs_close: called twice on the same handle\n");
188 /* Remove any handlers that might be called back before we kill the
191 g->log_message_cb = NULL;
193 if (g->state != CONFIG)
194 guestfs_kill_subprocess (g);
197 snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
206 for (i = 0; i < g->cmdline_size; ++i)
207 free (g->cmdline[i]);
211 /* Mark the handle as dead before freeing it. */
212 g->state = NO_HANDLE;
218 default_error_cb (guestfs_h *g, void *data, const char *msg)
220 fprintf (stderr, "libguestfs: error: %s\n", msg);
224 error (guestfs_h *g, const char *fs, ...)
229 if (!g->error_cb) return;
232 vasprintf (&msg, fs, args);
235 g->error_cb (g, g->error_cb_data, msg);
241 perrorf (guestfs_h *g, const char *fs, ...)
247 if (!g->error_cb) return;
250 vasprintf (&msg, fs, args);
255 strerror_r (err, buf, sizeof buf);
259 buf = strerror_r (err, _buf, sizeof _buf);
262 msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
266 g->error_cb (g, g->error_cb_data, msg);
272 safe_malloc (guestfs_h *g, int nbytes)
274 void *ptr = malloc (nbytes);
275 if (!ptr) g->abort_cb ();
280 safe_realloc (guestfs_h *g, void *ptr, int nbytes)
282 void *p = realloc (ptr, nbytes);
283 if (!p) g->abort_cb ();
288 safe_strdup (guestfs_h *g, const char *str)
290 char *s = strdup (str);
291 if (!s) g->abort_cb ();
296 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
302 guestfs_get_out_of_memory_handler (guestfs_h *g)
308 guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
311 g->error_cb_data = data;
314 guestfs_error_handler_cb
315 guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
317 if (data_rtn) *data_rtn = g->error_cb_data;
322 guestfs_set_verbose (guestfs_h *g, int v)
328 guestfs_get_verbose (guestfs_h *g)
333 /* Add a string to the current command line. */
335 incr_cmdline_size (guestfs_h *g)
337 if (g->cmdline == NULL) {
338 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
340 g->cmdline = safe_malloc (g, sizeof (char *));
341 g->cmdline[0] = NULL;
345 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
349 add_cmdline (guestfs_h *g, const char *str)
351 if (g->state != CONFIG) {
352 error (g, "command line cannot be altered after qemu subprocess launched");
356 incr_cmdline_size (g);
357 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
362 guestfs_config (guestfs_h *g,
363 const char *qemu_param, const char *qemu_value)
365 if (qemu_param[0] != '-') {
366 error (g, "guestfs_config: parameter must begin with '-' character");
370 /* A bit fascist, but the user will probably break the extra
371 * parameters that we add if they try to set any of these.
373 if (strcmp (qemu_param, "-kernel") == 0 ||
374 strcmp (qemu_param, "-initrd") == 0 ||
375 strcmp (qemu_param, "-nographic") == 0 ||
376 strcmp (qemu_param, "-serial") == 0 ||
377 strcmp (qemu_param, "-vnc") == 0 ||
378 strcmp (qemu_param, "-full-screen") == 0 ||
379 strcmp (qemu_param, "-std-vga") == 0 ||
380 strcmp (qemu_param, "-vnc") == 0) {
381 error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
385 if (add_cmdline (g, qemu_param) != 0) return -1;
387 if (qemu_value != NULL) {
388 if (add_cmdline (g, qemu_value) != 0) return -1;
395 guestfs_add_drive (guestfs_h *g, const char *filename)
397 int len = strlen (filename) + 64;
400 if (strchr (filename, ',') != NULL) {
401 error (g, "filename cannot contain ',' (comma) character");
405 snprintf (buf, len, "file=%s", filename);
407 return guestfs_config (g, "-drive", buf);
411 guestfs_add_cdrom (guestfs_h *g, const char *filename)
413 if (strchr (filename, ',') != NULL) {
414 error (g, "filename cannot contain ',' (comma) character");
418 return guestfs_config (g, "-cdrom", filename);
422 guestfs_launch (guestfs_h *g)
424 static const char *dir_template = "/tmp/libguestfsXXXXXX";
428 /*const char *qemu = QEMU;*/ /* XXX */
429 const char *qemu = "/usr/bin/qemu-system-x86_64";
430 const char *kernel = "vmlinuz.fedora-10.x86_64";
431 const char *initrd = "initramfs.fedora-10.x86_64.img";
433 struct sockaddr_un addr;
435 /* XXX Choose which qemu to run. */
436 /* XXX Choose initrd, etc. */
440 error (g, "you must call guestfs_add_drive before guestfs_launch");
444 if (g->state != CONFIG) {
445 error (g, "qemu has already been launched");
449 /* Make the temporary directory containing the socket. */
451 g->tmpdir = safe_strdup (g, dir_template);
452 if (mkdtemp (g->tmpdir) == NULL) {
453 perrorf (g, "%s: cannot create temporary directory", dir_template);
458 snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
461 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
476 if (r == 0) { /* Child (qemu). */
480 /* Set up the full command line. Do this in the subprocess so we
481 * don't need to worry about cleaning up.
483 g->cmdline[0] = (char *) qemu;
485 /* Construct the -net channel parameter for qemu. */
486 snprintf (vmchannel, sizeof vmchannel,
487 "channel,%d:unix:%s,server,nowait",
488 VMCHANNEL_PORT, unixsock);
490 /* Linux kernel command line. */
491 snprintf (append, sizeof append,
492 "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
494 add_cmdline (g, "-m");
495 add_cmdline (g, "384"); /* XXX Choose best size. */
496 add_cmdline (g, "-kernel");
497 add_cmdline (g, (char *) kernel);
498 add_cmdline (g, "-initrd");
499 add_cmdline (g, (char *) initrd);
500 add_cmdline (g, "-append");
501 add_cmdline (g, append);
502 add_cmdline (g, "-nographic");
503 add_cmdline (g, "-serial");
504 add_cmdline (g, "stdio");
505 add_cmdline (g, "-net");
506 add_cmdline (g, vmchannel);
507 add_cmdline (g, "-net");
508 add_cmdline (g, "user,vlan=0");
509 add_cmdline (g, "-net");
510 add_cmdline (g, "nic,vlan=0");
511 incr_cmdline_size (g);
512 g->cmdline[g->cmdline_size-1] = NULL;
515 fprintf (stderr, "%s", qemu);
516 for (i = 0; g->cmdline[i]; ++i)
517 fprintf (stderr, " %s", g->cmdline[i]);
518 fprintf (stderr, "\n");
521 /* Set up stdin, stdout. */
530 /* Set up a new process group, so we can signal this process
531 * and all subprocesses (eg. if qemu is really a shell script).
536 execv (qemu, g->cmdline); /* Run qemu. */
541 /* Parent (library). */
544 /* Start the clock ... */
547 /* Close the other ends of the pipe. */
551 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
552 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
553 perrorf (g, "fcntl");
557 g->fd[0] = wfd[1]; /* stdin of child */
558 g->fd[1] = rfd[0]; /* stdout of child */
560 /* Open the Unix socket. The vmchannel implementation that got
561 * merged with qemu sucks in a number of ways. Both ends do
562 * connect(2), which means that no one knows what, if anything, is
563 * connected to the other end, or if it becomes disconnected. Even
564 * worse, we have to wait some indeterminate time for qemu to create
565 * the socket and connect to it (which happens very early in qemu's
566 * start-up), so any code that uses vmchannel is inherently racy.
567 * Hence this silly loop.
569 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
571 perrorf (g, "socket");
575 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
576 perrorf (g, "fcntl");
580 addr.sun_family = AF_UNIX;
581 strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
582 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
586 /* Always sleep at least once to give qemu a small chance to start up. */
589 r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
590 if ((r == -1 && errno == EINPROGRESS) || r == 0)
594 perrorf (g, "connect");
598 error (g, "failed to connect to vmchannel socket");
602 /* Watch the file descriptors. */
605 g->msg_in_size = g->msg_in_allocated = 0;
613 main_loop.add_handle (g, g->fd[1],
614 GUESTFS_HANDLE_READABLE,
616 if (g->stdout_watch == -1) {
617 error (g, "could not watch qemu stdout");
622 main_loop.add_handle (g, g->sock,
623 GUESTFS_HANDLE_READABLE,
625 if (g->sock_watch == -1) {
626 error (g, "could not watch daemon communications socket");
630 g->state = LAUNCHING;
634 if (g->stdout_watch >= 0)
635 main_loop.remove_handle (g, g->stdout_watch);
636 if (g->sock_watch >= 0)
637 main_loop.remove_handle (g, g->sock_watch);
646 waitpid (g->pid, NULL, 0);
652 g->stdout_watch = -1;
658 finish_wait_ready (guestfs_h *g, void *vp)
661 main_loop.main_loop_quit (g);
665 guestfs_wait_ready (guestfs_h *g)
669 if (g->state == READY) return 0;
671 if (g->state == BUSY) {
672 error (g, "qemu has finished launching already");
676 if (g->state != LAUNCHING) {
677 error (g, "qemu has not been launched yet");
681 g->launch_done_cb_internal = finish_wait_ready;
682 g->launch_done_cb_internal_data = &r;
683 main_loop.main_loop_run (g);
684 g->launch_done_cb_internal = NULL;
685 g->launch_done_cb_internal_data = NULL;
688 error (g, "guestfs_wait_ready failed, see earlier error messages");
692 /* This is possible in some really strange situations, such as
693 * guestfsd starts up OK but then qemu immediately exits. Check for
694 * it because the caller is probably expecting to be able to send
695 * commands after this function returns.
697 if (g->state != READY) {
698 error (g, "qemu launched and contacted daemon, but state != READY");
706 guestfs_kill_subprocess (guestfs_h *g)
708 if (g->state == CONFIG) {
709 error (g, "no subprocess to kill");
714 fprintf (stderr, "sending SIGTERM to process group %d\n", g->pid);
716 kill (g->pid, SIGTERM);
721 /* This function is called whenever qemu prints something on stdout.
722 * Qemu's stdout is also connected to the guest's serial console, so
723 * we see kernel messages here too.
726 stdout_event (void *data, int watch, int fd, int events)
728 guestfs_h *g = (guestfs_h *) data;
735 "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
736 g, g->state, fd, events);
739 if (g->fd[1] != fd) {
740 error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
744 n = read (fd, buf, sizeof buf);
746 /* Hopefully this indicates the qemu child process has died. */
748 fprintf (stderr, "stdout_event: %p: child process died\n", g);
749 /*kill (g->pid, SIGTERM);*/
750 waitpid (g->pid, NULL, 0);
751 if (g->stdout_watch >= 0)
752 main_loop.remove_handle (g, g->stdout_watch);
753 if (g->sock_watch >= 0)
754 main_loop.remove_handle (g, g->sock_watch);
763 g->stdout_watch = -1;
766 if (g->subprocess_quit_cb)
767 g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
777 /* In verbose mode, copy all log messages to stderr. */
781 /* It's an actual log message, send it upwards if anyone is listening. */
782 if (g->log_message_cb)
783 g->log_message_cb (g, g->log_message_cb_data, buf, n);
786 /* The function is called whenever we can read something on the
787 * guestfsd (daemon inside the guest) communication socket.
790 sock_read_event (void *data, int watch, int fd, int events)
792 guestfs_h *g = (guestfs_h *) data;
799 "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
800 g, g->state, fd, events);
803 error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
807 if (g->msg_in_size <= g->msg_in_allocated) {
808 g->msg_in_allocated += 4096;
809 g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
811 n = read (g->sock, g->msg_in + g->msg_in_size,
812 g->msg_in_allocated - g->msg_in_size);
814 /* Disconnected? Ignore it because stdout_watch will get called
815 * and will do the cleanup.
827 /* Have we got enough of a message to be able to process it yet? */
828 if (g->msg_in_size < 4) return;
830 xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
831 if (!xdr_uint32_t (&xdr, &len)) {
832 error (g, "can't decode length word");
836 /* Length is normally the length of the message, but when guestfsd
837 * starts up it sends a "magic" value (longer than any possible
838 * message). Check for this.
840 if (len == 0xf5f55ff5) {
841 if (g->state != LAUNCHING)
842 error (g, "received magic signature from guestfsd, but in state %d",
844 else if (g->msg_in_size != 4)
845 error (g, "received magic signature from guestfsd, but msg size is %d",
849 if (g->launch_done_cb_internal)
850 g->launch_done_cb_internal (g, g->launch_done_cb_internal_data);
851 if (g->launch_done_cb)
852 g->launch_done_cb (g, g->launch_done_cb_data);
858 /* If this happens, it's pretty bad and we've probably lost synchronization.*/
859 if (len > GUESTFS_MESSAGE_MAX) {
860 error (g, "message length (%u) > maximum possible size (%d)",
861 len, GUESTFS_MESSAGE_MAX);
865 if (g->msg_in_size < len) return; /* Need more of this message. */
867 /* This should not happen, and if it does it probably means we've
868 * lost all hope of synchronization.
870 if (g->msg_in_size > len) {
871 error (g, "len = %d, but msg_in_size = %d", len, g->msg_in_size);
875 /* Not in the expected state. */
876 if (g->state != BUSY)
877 error (g, "state %d != BUSY", g->state);
879 /* Push the message up to the higher layer. Note that unlike
880 * launch_done_cb / launch_done_cb_internal, we only call at
881 * most one of the callback functions here.
884 if (g->reply_cb_internal)
885 g->reply_cb_internal (g, g->reply_cb_internal_data, &xdr);
886 else if (g->reply_cb)
887 g->reply_cb (g, g->reply_cb, &xdr);
890 /* Free the message buffer if it's grown excessively large. */
891 if (g->msg_in_allocated > 65536) {
894 g->msg_in_size = g->msg_in_allocated = 0;
901 /* The function is called whenever we can write something on the
902 * guestfsd (daemon inside the guest) communication socket.
905 sock_write_event (void *data, int watch, int fd, int events)
907 guestfs_h *g = (guestfs_h *) data;
912 "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
913 g, g->state, fd, events);
916 error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
920 if (g->state != BUSY) {
921 error (g, "sock_write_event: state %d != BUSY", g->state);
926 fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
927 g->msg_out_size - g->msg_out_pos);
929 n = write (g->sock, g->msg_out + g->msg_out_pos,
930 g->msg_out_size - g->msg_out_pos);
933 perrorf (g, "write");
938 fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
943 if (g->msg_out_pos < g->msg_out_size)
947 fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n", n);
950 g->msg_out_pos = g->msg_out_size = 0;
952 if (main_loop.remove_handle (g, g->sock_watch) == -1) {
953 error (g, "remove_handle failed in sock_write_event");
957 main_loop.add_handle (g, g->sock,
958 GUESTFS_HANDLE_READABLE,
960 if (g->sock_watch == -1) {
961 error (g, "add_handle failed in sock_write_event");
966 /* Dispatch a call to the remote daemon. This function just queues
967 * the call in msg_out, to be sent when we next enter the main loop.
968 * Returns -1 for error, or the message serial number.
971 dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
973 char buffer[GUESTFS_MESSAGE_MAX];
974 struct guestfs_message_header hdr;
977 int serial = g->msg_next_serial++;
979 if (g->state != READY) {
980 error (g, "dispatch: state %d != READY", g->state);
984 /* Serialize the header. */
985 hdr.prog = GUESTFS_PROGRAM;
986 hdr.vers = GUESTFS_PROTOCOL_VERSION;
988 hdr.direction = GUESTFS_DIRECTION_CALL;
990 hdr.status = GUESTFS_STATUS_OK;
992 xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
993 if (!xdr_guestfs_message_header (&xdr, &hdr)) {
994 error (g, "xdr_guestfs_message_header failed");
998 /* Serialize the args. If any, because some message types
999 * have no parameters.
1002 if (!(*xdrp) (&xdr, args)) {
1003 error (g, "dispatch failed to marshal args");
1008 len = xdr_getpos (&xdr);
1011 /* Allocate the outgoing message buffer. */
1012 g->msg_out = safe_malloc (g, len + 4);
1014 g->msg_out_size = len + 4;
1018 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
1019 if (!xdr_uint32_t (&xdr, &len)) {
1020 error (g, "xdr_uint32_t failed in dispatch");
1024 memcpy (g->msg_out + 4, buffer, len);
1026 /* Change the handle to sock_write_event. */
1027 if (main_loop.remove_handle (g, g->sock_watch) == -1) {
1028 error (g, "remove_handle failed in dispatch");
1032 main_loop.add_handle (g, g->sock,
1033 GUESTFS_HANDLE_WRITABLE,
1034 sock_write_event, g);
1035 if (g->sock_watch == -1) {
1036 error (g, "add_handle failed in dispatch");
1045 g->msg_out_size = 0;
1050 /* The high-level actions are autogenerated by generator.ml. Include
1053 #include "guestfs-actions.c"
1055 /* This is the default main loop implementation, using select(2). */
1057 struct handle_cb_data {
1058 guestfs_handle_event_cb cb;
1065 static int select_init_done = 0;
1066 static int max_fd = -1;
1067 static int nr_fds = 0;
1068 static struct handle_cb_data *handle_cb_data = NULL;
1073 if (!select_init_done) {
1078 select_init_done = 1;
1083 select_add_handle (guestfs_h *g, int fd, int events,
1084 guestfs_handle_event_cb cb, void *data)
1088 if (fd < 0 || fd >= FD_SETSIZE) {
1089 error (g, "fd %d is out of range", fd);
1093 if ((events & ~(GUESTFS_HANDLE_READABLE |
1094 GUESTFS_HANDLE_WRITABLE |
1095 GUESTFS_HANDLE_HANGUP |
1096 GUESTFS_HANDLE_ERROR)) != 0) {
1097 error (g, "set of events (0x%x) contains unknown events", events);
1102 error (g, "set of events is empty");
1106 if (FD_ISSET (fd, &rset) || FD_ISSET (fd, &wset) || FD_ISSET (fd, &xset)) {
1107 error (g, "fd %d is already registered", fd);
1112 error (g, "callback is NULL");
1116 if ((events & GUESTFS_HANDLE_READABLE))
1118 if ((events & GUESTFS_HANDLE_WRITABLE))
1120 if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
1125 handle_cb_data = safe_realloc (g, handle_cb_data,
1126 sizeof (struct handle_cb_data) * (max_fd+1));
1128 handle_cb_data[fd].cb = cb;
1129 handle_cb_data[fd].data = data;
1133 /* Any integer >= 0 can be the handle, and this is as good as any ... */
1138 select_remove_handle (guestfs_h *g, int fd)
1142 if (fd < 0 || fd >= FD_SETSIZE) {
1143 error (g, "fd %d is out of range", fd);
1147 if (!FD_ISSET (fd, &rset) && !FD_ISSET (fd, &wset) && !FD_ISSET (fd, &xset)) {
1148 error (g, "fd %d was not registered", fd);
1158 handle_cb_data = safe_realloc (g, handle_cb_data,
1159 sizeof (struct handle_cb_data) * (max_fd+1));
1168 select_add_timeout (guestfs_h *g, int interval,
1169 guestfs_handle_timeout_cb cb, void *data)
1173 abort (); /* XXX not implemented yet */
1177 select_remove_timeout (guestfs_h *g, int timer)
1181 abort (); /* XXX not implemented yet */
1184 /* Note that main loops can be nested. */
1185 static int level = 0;
1188 select_main_loop_run (guestfs_h *g)
1190 int old_level, fd, r, events;
1191 fd_set rset2, wset2, xset2;
1195 old_level = level++;
1196 while (level > old_level) {
1205 r = select (max_fd+1, &rset2, &wset2, &xset2, NULL);
1207 perrorf (g, "select");
1212 for (fd = 0; r > 0 && fd <= max_fd; ++fd) {
1214 if (FD_ISSET (fd, &rset2))
1215 events |= GUESTFS_HANDLE_READABLE;
1216 if (FD_ISSET (fd, &wset2))
1217 events |= GUESTFS_HANDLE_WRITABLE;
1218 if (FD_ISSET (fd, &xset2))
1219 events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
1222 handle_cb_data[fd].cb (handle_cb_data[fd].data,
1230 select_main_loop_quit (guestfs_h *g)
1235 error (g, "cannot quit, we are not in a main loop");