1 /* -*- c-file-style: "linux" -*-
3 Copyright (C) 1996-2001 by Andrew Tridgell <tridge@samba.org>
4 Copyright (C) Paul Mackerras 1996
5 Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 extern int am_generator;
34 extern int blocking_io;
35 extern int remove_sent_files;
36 extern int daemon_over_rsh;
37 extern int need_messages_from_generator;
38 extern int kluge_around_eof;
40 extern int log_got_error;
42 extern int orig_umask;
43 extern int copy_links;
44 extern int keep_dirlinks;
45 extern int preserve_hard_links;
46 extern int protocol_version;
48 extern int fuzzy_basis;
49 extern int relative_paths;
50 extern int rsync_port;
52 extern int make_backups;
53 extern int whole_file;
54 extern int read_batch;
55 extern int write_batch;
57 extern int batch_gen_fd;
58 extern int filesfrom_fd;
59 extern pid_t cleanup_child_pid;
60 extern struct stats stats;
61 extern char *filesfrom_host;
62 extern char *partial_dir;
63 extern char *basis_dir[];
64 extern char *rsync_path;
65 extern char *shell_cmd;
66 extern char *batch_name;
69 struct file_list *the_file_list;
71 /* There's probably never more than at most 2 outstanding child processes,
72 * but set it higher, just in case. */
73 #define MAXCHILDPROCS 5
78 } pid_stat_table[MAXCHILDPROCS];
80 static void show_malloc_stats(void);
82 /****************************************************************************
83 wait for a process to exit, calling io_flush while waiting
84 ****************************************************************************/
85 void wait_process(pid_t pid, int *status)
90 while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
95 if (waited_pid == -1 && errno == ECHILD) {
96 /* status of requested child no longer available.
97 * check to see if it was processed by the sigchld_handler.
99 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
100 if (pid == pid_stat_table[cnt].pid) {
101 *status = pid_stat_table[cnt].status;
102 pid_stat_table[cnt].pid = 0;
108 /* TODO: If the child exited on a signal, then log an
109 * appropriate error message. Perhaps we should also accept a
110 * message describing the purpose of the child. Also indicate
111 * this to the caller so that thhey know something went
113 *status = WEXITSTATUS(*status);
116 /* This function gets called from all 3 processes. We want the client side
117 * to actually output the text, but the sender is the only process that has
118 * all the stats we need. So, if we're a client sender, we do the report.
119 * If we're a server sender, we write the stats on the supplied fd. If
120 * we're the client receiver we read the stats from the supplied fd and do
121 * the report. All processes might also generate a set of debug stats, if
122 * the verbose level is high enough (this is the only thing that the
123 * generator process and the server receiver ever do here). */
124 static void report(int f)
126 /* Cache two stats because the read/write code can change it. */
127 int64 total_read = stats.total_read;
128 int64 total_written = stats.total_written;
129 time_t t = time(NULL);
131 if (do_stats && verbose > 1) {
132 /* These come out from every process */
141 log_exit(0, __FILE__, __LINE__);
142 if (f == -1 || !am_sender)
148 write_longint(f, total_read);
149 write_longint(f, total_written);
150 write_longint(f, stats.total_size);
151 if (protocol_version >= 29) {
152 write_longint(f, stats.flist_buildtime);
153 write_longint(f, stats.flist_xfertime);
159 /* this is the client */
162 /* Read the first two in opposite order because the meaning of
163 * read/write swaps when switching from sender to receiver. */
164 total_written = read_longint(f);
165 total_read = read_longint(f);
166 stats.total_size = read_longint(f);
167 if (protocol_version >= 29) {
168 stats.flist_buildtime = read_longint(f);
169 stats.flist_xfertime = read_longint(f);
171 } else if (write_batch) {
172 /* The --read-batch process is going to be a client
173 * receiver, so we need to give it the stats. */
174 write_longint(batch_fd, total_read);
175 write_longint(batch_fd, total_written);
176 write_longint(batch_fd, stats.total_size);
177 if (protocol_version >= 29) {
178 write_longint(batch_fd, stats.flist_buildtime);
179 write_longint(batch_fd, stats.flist_xfertime);
184 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
185 rprintf(FINFO,"Number of files transferred: %d\n",
186 stats.num_transferred_files);
187 rprintf(FINFO,"Total file size: %.0f bytes\n",
188 (double)stats.total_size);
189 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
190 (double)stats.total_transferred_size);
191 rprintf(FINFO,"Literal data: %.0f bytes\n",
192 (double)stats.literal_data);
193 rprintf(FINFO,"Matched data: %.0f bytes\n",
194 (double)stats.matched_data);
195 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
196 if (stats.flist_buildtime) {
198 "File list generation time: %.3f seconds\n",
199 (double)stats.flist_buildtime / 1000);
201 "File list transfer time: %.3f seconds\n",
202 (double)stats.flist_xfertime / 1000);
204 rprintf(FINFO,"Total bytes sent: %.0f\n",
205 (double)total_written);
206 rprintf(FINFO,"Total bytes received: %.0f\n",
210 if (verbose || do_stats) {
212 "\nsent %.0f bytes received %.0f bytes %.2f bytes/sec\n",
213 (double)total_written, (double)total_read,
214 (total_written + total_read)/(0.5 + (t - starttime)));
215 rprintf(FINFO, "total size is %.0f speedup is %.2f\n",
216 (double)stats.total_size,
217 (double)stats.total_size / (total_written+total_read));
226 * If our C library can get malloc statistics, then show them to FINFO
228 static void show_malloc_stats(void)
235 rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
236 getpid(), am_server ? "server " : "",
237 am_daemon ? "daemon " : "", who_am_i());
238 rprintf(FINFO, " arena: %10ld (bytes from sbrk)\n",
240 rprintf(FINFO, " ordblks: %10ld (chunks not in use)\n",
242 rprintf(FINFO, " smblks: %10ld\n",
244 rprintf(FINFO, " hblks: %10ld (chunks from mmap)\n",
246 rprintf(FINFO, " hblkhd: %10ld (bytes from mmap)\n",
248 rprintf(FINFO, " allmem: %10ld (bytes from sbrk + mmap)\n",
249 (long)mi.arena + mi.hblkhd);
250 rprintf(FINFO, " usmblks: %10ld\n",
252 rprintf(FINFO, " fsmblks: %10ld\n",
254 rprintf(FINFO, " uordblks: %10ld (bytes used)\n",
256 rprintf(FINFO, " fordblks: %10ld (bytes free)\n",
258 rprintf(FINFO, " keepcost: %10ld (bytes in releasable chunk)\n",
260 #endif /* HAVE_MALLINFO */
264 /* Start the remote shell. cmd may be NULL to use the default. */
265 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
266 int *f_in, int *f_out)
269 char *args[MAX_ARGS];
271 char *tok, *dir = NULL;
274 if (!read_batch && !local_server) {
275 char *rsh_env = getenv(RSYNC_RSH_ENV);
284 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
285 /* Comparison leaves rooms for server_options(). */
286 if (argc >= MAX_ARGS - 100) {
287 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
288 exit_cleanup(RERR_SYNTAX);
293 /* check to see if we've already been given '-l user' in
294 * the remote-shell command */
295 for (i = 0; i < argc-1; i++) {
296 if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
301 /* remsh (on HPUX) takes the arguments the other way around */
302 args[argc++] = machine;
303 if (user && !(daemon_over_rsh && dash_l_set)) {
308 if (user && !(daemon_over_rsh && dash_l_set)) {
312 args[argc++] = machine;
315 args[argc++] = rsync_path;
317 if (blocking_io < 0) {
319 if ((cp = strrchr(cmd, '/')) != NULL)
323 if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
327 server_options(args,&argc);
329 if (argc >= MAX_ARGS - 2) {
330 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
331 exit_cleanup(RERR_SYNTAX);
337 if (!daemon_over_rsh && path && *path)
343 rprintf(FINFO,"cmd=");
344 for (i = 0; i < argc; i++)
345 rprintf(FINFO, "%s ", safe_fname(args[i]));
350 int from_gen_pipe[2];
351 if (fd_pair(from_gen_pipe) < 0) {
352 rsyserr(FERROR, errno, "pipe");
353 exit_cleanup(RERR_IPC);
355 batch_gen_fd = from_gen_pipe[0];
356 *f_out = from_gen_pipe[1];
358 ret = -1; /* no child pid */
359 } else if (local_server) {
360 /* If the user didn't request --[no-]whole-file, force
361 * it on, but only if we're not batch processing. */
362 if (whole_file < 0 && !write_batch)
364 ret = local_child(argc, args, f_in, f_out, child_main);
366 ret = piped_child(args,f_in,f_out);
374 out_of_memory("do_cmd");
375 return 0; /* not reached */
379 static char *get_local_name(struct file_list *flist,char *name)
385 rprintf(FINFO,"get_local_name count=%d %s\n",
386 flist->count, NS(name));
391 if (do_stat(name,&st) == 0) {
392 if (S_ISDIR(st.st_mode)) {
393 if (!push_dir(name)) {
394 rsyserr(FERROR, errno, "push_dir#1 %s failed",
396 exit_cleanup(RERR_FILESELECT);
400 if (flist->count > 1) {
401 rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
402 exit_cleanup(RERR_FILESELECT);
407 if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
410 if (do_mkdir(name,0777 & ~orig_umask) != 0) {
411 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
412 exit_cleanup(RERR_FILEIO);
415 rprintf(FINFO, "created directory %s\n", safe_fname(name));
422 if (!push_dir(name)) {
423 rsyserr(FERROR, errno, "push_dir#2 %s failed",
425 exit_cleanup(RERR_FILESELECT);
432 /* This is only called by the sender. */
433 static void read_final_goodbye(int f_in, int f_out, int flist_count)
437 if (protocol_version < 29)
440 while ((i = read_int(f_in)) == flist_count
441 && read_shortint(f_in) == ITEM_IS_NEW) {
442 /* Forward the keep-alive (no-op) to the receiver. */
443 write_int(f_out, flist_count);
444 write_shortint(f_out, ITEM_IS_NEW);
449 rprintf(FERROR, "Invalid packet from generator at end of run.\n");
450 exit_cleanup(RERR_PROTOCOL);
455 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
458 struct file_list *flist;
462 rprintf(FINFO, "server_sender starting pid=%ld\n",
466 if (am_daemon && lp_write_only(module_id)) {
467 rprintf(FERROR, "ERROR: module is write only\n");
468 exit_cleanup(RERR_SYNTAX);
471 if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
473 "ERROR: --remove-sent-files cannot be used with a read-only module\n");
474 exit_cleanup(RERR_SYNTAX);
478 if (!relative_paths && !push_dir(dir)) {
479 rsyserr(FERROR, errno, "push_dir#3 %s failed",
481 exit_cleanup(RERR_FILESELECT);
486 if (strcmp(dir,".")) {
488 if (strcmp(dir,"/") == 0)
490 for (i = 0; i < argc; i++)
494 if (argc == 0 && (recurse || list_only)) {
500 flist = send_file_list(f_out,argc,argv);
501 if (!flist || flist->count == 0) {
504 the_file_list = flist;
506 io_start_buffering_in();
507 io_start_buffering_out();
509 send_files(flist,f_out,f_in);
510 io_flush(FULL_FLUSH);
512 if (protocol_version >= 24)
513 read_final_goodbye(f_in, f_out, flist->count);
514 io_flush(FULL_FLUSH);
519 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
523 int error_pipe[2], name_pipe[2];
524 BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis
525 || (inplace && make_backups)) && !dry_run;
527 /* The receiving side mustn't obey this, or an existing symlink that
528 * points to an identical file won't be replaced by the referent. */
531 if (preserve_hard_links)
532 init_hard_links(flist);
534 if (fd_pair(error_pipe) < 0
535 || (need_name_pipe && fd_pair(name_pipe) < 0)) {
536 rsyserr(FERROR, errno, "pipe failed in do_recv");
537 exit_cleanup(RERR_IPC);
540 io_flush(NORMAL_FLUSH);
542 if ((pid = do_fork()) == -1) {
543 rsyserr(FERROR, errno, "fork failed in do_recv");
544 exit_cleanup(RERR_IPC);
548 close(error_pipe[0]);
549 if (need_name_pipe) {
551 set_blocking(name_pipe[0]);
557 /* we can't let two processes write to the socket at one time */
558 close_multiplexing_out();
560 /* set place to send errors */
561 set_msg_fd_out(error_pipe[1]);
563 recv_files(f_in, flist, local_name, name_pipe[0]);
564 io_flush(FULL_FLUSH);
567 send_msg(MSG_DONE, "", 0);
568 io_flush(FULL_FLUSH);
570 /* Handle any keep-alive packets from the post-processing work
571 * that the generator does. */
572 if (protocol_version >= 29) {
573 kluge_around_eof = -1;
575 /* This should only get stopped via a USR2 signal. */
576 while (read_int(f_in) == flist->count
577 && read_shortint(f_in) == ITEM_IS_NEW) {}
579 rprintf(FERROR, "Invalid packet from server at end of run.\n");
580 exit_cleanup(RERR_PROTOCOL);
583 /* Finally, we go to sleep until our parent kills us with a
584 * USR2 signal. We sleep for a short time, as on some OSes
585 * a signal won't interrupt a sleep! */
591 close_multiplexing_in();
595 close(error_pipe[1]);
596 if (need_name_pipe) {
598 set_nonblocking(name_pipe[1]);
604 io_start_buffering_out();
606 set_msg_fd_in(error_pipe[0]);
608 generate_files(f_out, flist, local_name, name_pipe[1]);
611 io_flush(FULL_FLUSH);
612 if (protocol_version >= 24) {
613 /* send a final goodbye message */
614 write_int(f_out, -1);
616 io_flush(FULL_FLUSH);
620 wait_process(pid, &status);
625 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
628 struct file_list *flist;
629 char *local_name = NULL;
631 int save_verbose = verbose;
633 if (filesfrom_fd >= 0) {
634 /* We can't mix messages with files-from data on the socket,
635 * so temporarily turn off verbose messages. */
640 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
641 argc, (long)getpid());
644 if (am_daemon && lp_read_only(module_id)) {
645 rprintf(FERROR,"ERROR: module is read only\n");
646 exit_cleanup(RERR_SYNTAX);
655 if (!am_daemon && !push_dir(dir)) {
656 rsyserr(FERROR, errno, "push_dir#4 %s failed",
658 exit_cleanup(RERR_FILESELECT);
662 io_start_buffering_in();
663 recv_filter_list(f_in);
665 if (filesfrom_fd >= 0) {
666 /* We need to send the files-from names to the sender at the
667 * same time that we receive the file-list from them, so we
668 * need the IO routines to automatically write out the names
669 * onto our f_out socket as we read the file-list. This
670 * avoids both deadlock and extra delays/buffers. */
671 io_set_filesfrom_fds(filesfrom_fd, f_out);
675 flist = recv_file_list(f_in);
676 verbose = save_verbose;
678 rprintf(FERROR,"server_recv: recv_file_list error\n");
679 exit_cleanup(RERR_FILESELECT);
681 the_file_list = flist;
684 if (strcmp(dir,".")) {
685 argv[0] += strlen(dir);
686 if (argv[0][0] == '/')
689 local_name = get_local_name(flist,argv[0]);
692 status = do_recv(f_in,f_out,flist,local_name);
693 exit_cleanup(status);
697 int child_main(int argc, char *argv[])
699 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
704 void start_server(int f_in, int f_out, int argc, char *argv[])
706 set_nonblocking(f_in);
707 set_nonblocking(f_out);
709 io_set_sock_fds(f_in, f_out);
710 setup_protocol(f_out, f_in);
712 if (protocol_version >= 23)
713 io_start_multiplex_out();
716 keep_dirlinks = 0; /* Must be disabled on the sender. */
717 if (need_messages_from_generator)
718 io_start_multiplex_in();
720 recv_filter_list(f_in);
721 do_server_sender(f_in, f_out, argc, argv);
723 do_server_recv(f_in, f_out, argc, argv);
730 * This is called once the connection has been negotiated. It is used
731 * for rsyncd, remote-shell, and local connections.
733 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
735 struct file_list *flist = NULL;
736 int status = 0, status2 = 0;
737 char *local_name = NULL;
739 cleanup_child_pid = pid;
741 set_nonblocking(f_in);
742 set_nonblocking(f_out);
745 io_set_sock_fds(f_in, f_out);
746 setup_protocol(f_out,f_in);
748 if (protocol_version >= 23 && !read_batch)
749 io_start_multiplex_in();
751 /* We set our stderr file handle to blocking because ssh might have
752 * set it to non-blocking. This can be particularly troublesome if
753 * stderr is a clone of stdout, because ssh would have set our stdout
754 * to non-blocking at the same time (which can easily cause us to lose
755 * output from our print statements). This kluge shouldn't cause ssh
756 * any problems for how we use it. Note also that we delayed setting
757 * this until after the above protocol setup so that we know for sure
758 * that ssh is done twiddling its file descriptors. */
759 set_blocking(STDERR_FILENO);
762 keep_dirlinks = 0; /* Must be disabled on the sender. */
763 io_start_buffering_out();
766 send_filter_list(f_out);
771 start_write_batch(f_out);
772 flist = send_file_list(f_out, argc, argv);
775 rprintf(FINFO,"file list sent\n");
776 the_file_list = flist;
778 io_flush(NORMAL_FLUSH);
779 send_files(flist,f_out,f_in);
780 io_flush(FULL_FLUSH);
781 if (protocol_version >= 24)
782 read_final_goodbye(f_in, f_out, flist->count);
785 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
786 io_flush(FULL_FLUSH);
787 wait_process(pid, &status);
790 io_flush(FULL_FLUSH);
791 exit_cleanup(status);
794 if (need_messages_from_generator && !read_batch)
795 io_start_multiplex_out();
800 send_filter_list(read_batch ? -1 : f_out);
802 if (filesfrom_fd >= 0) {
803 io_set_filesfrom_fds(filesfrom_fd, f_out);
808 start_write_batch(f_in);
809 flist = recv_file_list(f_in);
810 if (!flist || flist->count == 0) {
811 rprintf(FINFO, "client: nothing to do: "
812 "perhaps you need to specify some filenames or "
813 "the --recursive option?\n");
816 the_file_list = flist;
818 local_name = get_local_name(flist,argv[0]);
820 status2 = do_recv(f_in,f_out,flist,local_name);
824 rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
825 io_flush(FULL_FLUSH);
826 wait_process(pid, &status);
829 return MAX(status, status2);
832 static int copy_argv (char *argv[])
836 for (i = 0; argv[i]; i++) {
837 if (!(argv[i] = strdup(argv[i]))) {
838 rprintf (FERROR, "out of memory at %s(%d)\n",
849 * Start a client for either type of remote connection. Work out
850 * whether the arguments request a remote shell or rsyncd connection,
851 * and call the appropriate connection function, then run_client.
853 * Calls either start_socket_client (for sockets) or do_cmd and
854 * client_run (for ssh).
856 static int start_client(int argc, char *argv[])
859 char *shell_machine = NULL;
860 char *shell_path = NULL;
861 char *shell_user = NULL;
867 /* Don't clobber argv[] so that ps(1) can still show the right
869 if ((rc = copy_argv(argv)))
872 if (!read_batch) { /* for read_batch, NO source is specified */
874 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
875 if (shell_path) { /* source is remote */
877 if (filesfrom_host && *filesfrom_host
878 && strcmp(filesfrom_host, shell_machine) != 0) {
880 "--files-from hostname is not the same as the transfer hostname\n");
881 exit_cleanup(RERR_SYNTAX);
885 return start_socket_client(shell_machine,
893 } else { /* source is local, check dest arg */
896 if (argc < 1) { /* destination required */
898 exit_cleanup(RERR_SYNTAX);
901 shell_path = check_for_hostspec(argv[argc], &shell_machine, &rsync_port);
902 if (shell_path && filesfrom_host && *filesfrom_host
903 && strcmp(filesfrom_host, shell_machine) != 0) {
905 "--files-from hostname is not the same as the transfer hostname\n");
906 exit_cleanup(RERR_SYNTAX);
908 if (!shell_path) { /* no hostspec found, so src & dest are local */
910 if (filesfrom_host) {
912 "--files-from cannot be remote when the transfer is local\n");
913 exit_cleanup(RERR_SYNTAX);
915 shell_machine = NULL;
916 shell_path = argv[argc];
917 } else if (rsync_port) {
919 return start_socket_client(shell_machine,
926 } else { /* read_batch */
928 shell_path = argv[argc-1];
929 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
930 rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
931 exit_cleanup(RERR_SYNTAX);
936 p = strrchr(shell_machine,'@');
939 shell_user = shell_machine;
945 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
946 shell_cmd ? safe_fname(shell_cmd) : "",
947 shell_machine ? safe_fname(shell_machine) : "",
948 shell_user ? safe_fname(shell_user) : "",
949 shell_path ? safe_fname(shell_path) : "");
952 /* for remote source, only single dest arg can remain ... */
953 if (!am_sender && argc > 1) {
955 exit_cleanup(RERR_SYNTAX);
958 /* ... or no dest at all */
959 if (!am_sender && argc == 0)
962 pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
965 /* if we're running an rsync server on the remote host over a
966 * remote shell command, we need to do the RSYNCD protocol first */
967 if (daemon_over_rsh) {
969 tmpret = start_inband_exchange(shell_user, shell_path,
975 ret = client_run(f_in, f_out, pid, argc, argv);
984 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
986 exit_cleanup(RERR_SIGNAL);
989 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
992 if (log_got_error) _exit(RERR_PARTIAL);
996 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1001 /* An empty waitpid() loop was put here by Tridge and we could never
1002 * get him to explain why he put it in, so rather than taking it
1003 * out we're instead saving the child exit statuses for later use.
1004 * The waitpid() loop presumably eliminates all possibility of leaving
1005 * zombie children, maybe that's why he did it.
1007 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1008 /* save the child's exit status */
1009 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1010 if (pid_stat_table[cnt].pid == 0) {
1011 pid_stat_table[cnt].pid = pid;
1012 pid_stat_table[cnt].status = status;
1022 * This routine catches signals and tries to send them to gdb.
1024 * Because it's called from inside a signal handler it ought not to
1025 * use too many library routines.
1027 * @todo Perhaps use "screen -X" instead/as well, to help people
1028 * debugging without easy access to X. Perhaps use an environment
1029 * variable, or just call a script?
1031 * @todo The /proc/ magic probably only works on Linux (and
1032 * Solaris?) Can we be more portable?
1034 #ifdef MAINTAINER_MODE
1035 const char *get_panic_action(void)
1037 const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1042 return "xterm -display :0 -T Panic -n Panic "
1043 "-e gdb /proc/%d/exe %d";
1048 * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1050 * This signal handler is only installed if we were configured with
1051 * --enable-maintainer-mode. Perhaps it should always be on and we
1052 * should just look at the environment variable, but I'm a bit leery
1053 * of a signal sending us into a busy loop.
1055 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1060 sprintf(cmd_buf, get_panic_action(),
1061 getpid(), getpid());
1063 /* Unless we failed to execute gdb, we allow the process to
1064 * continue. I'm not sure if that's right. */
1065 ret = system(cmd_buf);
1072 int main(int argc,char *argv[])
1075 int orig_argc = argc;
1076 char **orig_argv = argv;
1078 signal(SIGUSR1, sigusr1_handler);
1079 signal(SIGUSR2, sigusr2_handler);
1080 signal(SIGCHLD, sigchld_handler);
1081 #ifdef MAINTAINER_MODE
1082 signal(SIGSEGV, rsync_panic_handler);
1083 signal(SIGFPE, rsync_panic_handler);
1084 signal(SIGABRT, rsync_panic_handler);
1085 signal(SIGBUS, rsync_panic_handler);
1086 #endif /* def MAINTAINER_MODE */
1088 starttime = time(NULL);
1089 am_root = (MY_UID() == 0);
1091 memset(&stats, 0, sizeof(stats));
1095 exit_cleanup(RERR_SYNTAX);
1098 /* we set a 0 umask so that correct file permissions can be
1100 orig_umask = (int)umask(0);
1102 if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1103 /* FIXME: We ought to call the same error-handling
1104 * code here, rather than relying on getopt. */
1106 exit_cleanup(RERR_SYNTAX);
1109 signal(SIGINT,SIGNAL_CAST sig_int);
1110 signal(SIGHUP,SIGNAL_CAST sig_int);
1111 signal(SIGTERM,SIGNAL_CAST sig_int);
1113 /* Ignore SIGPIPE; we consistently check error codes and will
1115 signal(SIGPIPE, SIG_IGN);
1117 /* Initialize push_dir here because on some old systems getcwd
1118 * (implemented by forking "pwd" and reading its output) doesn't
1119 * work when there are other child processes. Also, on all systems
1120 * that implement getcwd that way "pwd" can't be found after chroot. */
1125 if (write_batch || read_batch) {
1127 write_batch_shell_file(orig_argc, orig_argv, argc);
1129 if (read_batch && strcmp(batch_name, "-") == 0)
1130 batch_fd = STDIN_FILENO;
1132 batch_fd = do_open(batch_name,
1133 write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1134 : O_RDONLY, S_IRUSR | S_IWUSR);
1137 rsyserr(FERROR, errno, "Batch file %s open error",
1138 full_fname(batch_name));
1139 exit_cleanup(RERR_FILEIO);
1142 read_stream_flags(batch_fd);
1145 if (am_daemon && !am_server)
1146 return daemon_main();
1150 exit_cleanup(RERR_SYNTAX);
1154 set_nonblocking(STDIN_FILENO);
1155 set_nonblocking(STDOUT_FILENO);
1157 return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1158 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1161 ret = start_client(argc, argv);
1163 exit_cleanup(RERR_STARTCLIENT);