X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/f0fca04e4e136c4a487a922e8fb09acf46aeafa0..e51094b7210fc31fa67cc218c1bd30de841a426e:/main.c diff --git a/main.c b/main.c index 0bcc7f54..0aeb29c0 100644 --- a/main.c +++ b/main.c @@ -1,17 +1,19 @@ -/* - Copyright (C) Andrew Tridgell 1996 +/* -*- c-file-style: "linux" -*- + + Copyright (C) 1996-2001 by Andrew Tridgell Copyright (C) Paul Mackerras 1996 - + Copyright (C) 2001, 2002 by Martin Pool + This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. - + This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - + You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. @@ -19,215 +21,236 @@ #include "rsync.h" -int verbose = 0; -int always_checksum = 0; time_t starttime = 0; -int64 total_size = 0; -int block_size=BLOCK_SIZE; - -char *backup_suffix = BACKUP_SUFFIX; -char *tmpdir = NULL; - -static char *rsync_path = RSYNC_NAME; - -int make_backups = 0; -int whole_file = 0; -int copy_links = 0; -int preserve_links = 0; -int preserve_hard_links = 0; -int preserve_perms = 0; -int preserve_devices = 0; -int preserve_uid = 0; -int preserve_gid = 0; -int preserve_times = 0; -int update_only = 0; -int cvs_exclude = 0; -int dry_run=0; -int local_server=0; -int ignore_times=0; -int delete_mode=0; -int one_file_system=0; -int remote_version=0; -int sparse_files=0; -int do_compression=0; -int am_root=0; -int orig_umask=0; -int relative_paths=0; -int numeric_ids = 0; -int force_delete = 0; -int io_timeout = 0; -int io_error = 0; -int read_only = 0; -static int module_id; - -static int port = RSYNC_PORT; - -static char *shell_cmd; - -extern int csum_length; - -int am_server = 0; -int am_sender=0; -int recurse = 0; -int am_daemon=0; - -static void usage(int fd); + +extern struct stats stats; +extern int am_root; +extern int am_server; +extern int am_sender; +extern int am_generator; +extern int am_daemon; +extern int verbose; +extern int blocking_io; +extern int cvs_exclude; +extern int delete_mode; +extern int delete_excluded; +extern int delete_after; +extern int daemon_over_rsh; +extern int do_stats; +extern int dry_run; +extern int list_only; +extern int local_server; +extern int log_got_error; +extern int module_id; +extern int orig_umask; +extern int preserve_hard_links; +extern int protocol_version; +extern int recurse; +extern int relative_paths; +extern int rsync_port; +extern int read_batch; +extern int write_batch; +extern int filesfrom_fd; +extern pid_t cleanup_child_pid; +extern char *files_from; +extern char *remote_filesfrom_file; +extern char *rsync_path; +extern char *shell_cmd; +extern struct file_list *batch_flist; + + +/* there's probably never more than at most 2 outstanding child processes, + * but set it higher just in case. + */ +#define MAXCHILDPROCS 5 + +struct pid_status { + pid_t pid; + int status; +} pid_stat_table[MAXCHILDPROCS]; + +static void show_malloc_stats(void); + +/**************************************************************************** +wait for a process to exit, calling io_flush while waiting +****************************************************************************/ +void wait_process(pid_t pid, int *status) +{ + pid_t waited_pid; + int cnt; + + while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) { + msleep(20); + io_flush(FULL_FLUSH); + } + + if ((waited_pid == -1) && (errno == ECHILD)) { + /* status of requested child no longer available. + * check to see if it was processed by the sigchld_handler. + */ + for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) { + if (pid == pid_stat_table[cnt].pid) { + *status = pid_stat_table[cnt].status; + pid_stat_table[cnt].pid = 0; + break; + } + } + } + + /* TODO: If the child exited on a signal, then log an + * appropriate error message. Perhaps we should also accept a + * message describing the purpose of the child. Also indicate + * this to the caller so that thhey know something went + * wrong. */ + *status = WEXITSTATUS(*status); +} static void report(int f) { - int64 in,out,tsize; - time_t t = time(NULL); - - if (!verbose) return; - - if (am_server && am_sender) { - write_longint(f,read_total()); - write_longint(f,write_total()); - write_longint(f,total_size); - write_flush(f); - return; - } - - if (am_sender) { - in = read_total(); - out = write_total(); - tsize = total_size; - } else { - in = read_longint(f); - out = read_longint(f); - tsize = read_longint(f); - } - - printf("wrote %.0f bytes read %.0f bytes %.2f bytes/sec\n", - (double)out,(double)in,(in+out)/(0.5 + (t-starttime))); - printf("total size is %.0f speedup is %.2f\n", - (double)tsize,(1.0*tsize)/(in+out)); + time_t t = time(NULL); + + if (do_stats && verbose > 1) { + /* These come out from every process */ + show_malloc_stats(); + show_flist_stats(); + } + + if (am_generator) + return; + + if (am_daemon) { + log_exit(0, __FILE__, __LINE__); + if (f == -1 || !am_sender) return; + } + + if (am_server) { + if (am_sender) { + int64 w; + /* store total_written in a temporary + * because write_longint changes it */ + w = stats.total_written; + write_longint(f,stats.total_read); + write_longint(f,w); + write_longint(f,stats.total_size); + } + return; + } + + /* this is the client */ + + if (!am_sender) { + int64 r; + stats.total_written = read_longint(f); + /* store total_read in a temporary, read_longint changes it */ + r = read_longint(f); + stats.total_size = read_longint(f); + stats.total_read = r; + } + + if (do_stats) { + rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files); + rprintf(FINFO,"Number of files transferred: %d\n", + stats.num_transferred_files); + rprintf(FINFO,"Total file size: %.0f bytes\n", + (double)stats.total_size); + rprintf(FINFO,"Total transferred file size: %.0f bytes\n", + (double)stats.total_transferred_size); + rprintf(FINFO,"Literal data: %.0f bytes\n", + (double)stats.literal_data); + rprintf(FINFO,"Matched data: %.0f bytes\n", + (double)stats.matched_data); + rprintf(FINFO,"File list size: %d\n", stats.flist_size); + rprintf(FINFO,"Total bytes written: %.0f\n", + (double)stats.total_written); + rprintf(FINFO,"Total bytes read: %.0f\n", + (double)stats.total_read); + } + + if (verbose || do_stats) { + rprintf(FINFO,"\nwrote %.0f bytes read %.0f bytes %.2f bytes/sec\n", + (double)stats.total_written, + (double)stats.total_read, + (stats.total_written+stats.total_read)/(0.5 + (t-starttime))); + rprintf(FINFO,"total size is %.0f speedup is %.2f\n", + (double)stats.total_size, + (1.0*stats.total_size)/(stats.total_written+stats.total_read)); + } + + fflush(stdout); + fflush(stderr); } -static void server_options(char **args,int *argc) +/** + * If our C library can get malloc statistics, then show them to FINFO + **/ +static void show_malloc_stats(void) { - int ac = *argc; - static char argstr[50]; - static char bsize[30]; - static char iotime[30]; - int i, x; - - args[ac++] = "--server"; - - if (!am_sender) - args[ac++] = "--sender"; - - x = 1; - argstr[0] = '-'; - for (i=0;i= (int)(sizeof args / sizeof args[0])) { + rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n"); + exit_cleanup(RERR_MALLOC); /* XXX Need better RERR? */ + } + args[argc] = NULL; if (verbose > 3) { @@ -254,7 +292,9 @@ static int do_cmd(char *cmd,char *machine,char *user,char *path,int *f_in,int *f } if (local_server) { - ret = local_child(argc, args, f_in, f_out); + if (read_batch) + create_flist_from_batch(); /* sets batch_flist */ + ret = local_child(argc, args, f_in, f_out, child_main); } else { ret = piped_child(args,f_in,f_out); } @@ -269,356 +309,530 @@ oom: } - - static char *get_local_name(struct file_list *flist,char *name) { - STRUCT_STAT st; - - if (do_stat(name,&st) == 0) { - if (S_ISDIR(st.st_mode)) { - if (chdir(name) != 0) { - rprintf(FERROR,"chdir %s : %s (1)\n",name,strerror(errno)); - exit_cleanup(1); - } - return NULL; - } - if (flist->count > 1) { - rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n"); - exit_cleanup(1); - } - return name; - } - - if (flist->count == 1) - return name; - - if (!name) - return NULL; - - if (do_mkdir(name,0777 & ~orig_umask) != 0) { - rprintf(FERROR,"mkdir %s : %s (1)\n",name,strerror(errno)); - exit_cleanup(1); - } else { - rprintf(FINFO,"created directory %s\n",name); - } - - if (chdir(name) != 0) { - rprintf(FERROR,"chdir %s : %s (2)\n",name,strerror(errno)); - exit_cleanup(1); - } - - return NULL; -} + STRUCT_STAT st; + int e; + + if (verbose > 2) + rprintf(FINFO,"get_local_name count=%d %s\n", + flist->count, NS(name)); + + if (!name) + return NULL; + + if (do_stat(name,&st) == 0) { + if (S_ISDIR(st.st_mode)) { + if (!push_dir(name)) { + rsyserr(FERROR, errno, "push_dir#1 %s failed", + full_fname(name)); + exit_cleanup(RERR_FILESELECT); + } + return NULL; + } + if (flist->count > 1) { + rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n"); + exit_cleanup(RERR_FILESELECT); + } + return name; + } + + if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/')) + return name; + + if (do_mkdir(name,0777 & ~orig_umask) != 0) { + rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name)); + exit_cleanup(RERR_FILEIO); + } else { + if (verbose > 0) + rprintf(FINFO,"created directory %s\n",name); + } + if (!push_dir(name)) { + rsyserr(FERROR, errno, "push_dir#2 %s failed", + full_fname(name)); + exit_cleanup(RERR_FILESELECT); + } + return NULL; +} static void do_server_sender(int f_in, int f_out, int argc,char *argv[]) { - int i; - struct file_list *flist; - char *dir = argv[0]; - - if (verbose > 2) - rprintf(FINFO,"server_sender starting pid=%d\n",(int)getpid()); - - if (!relative_paths && chdir(dir) != 0) { - rprintf(FERROR,"chdir %s: %s (3)\n",dir,strerror(errno)); - exit_cleanup(1); - } - argc--; - argv++; - - if (strcmp(dir,".")) { - int l = strlen(dir); - if (strcmp(dir,"/") == 0) - l = 0; - for (i=0;i 2) { + rprintf(FINFO, "server_sender starting pid=%ld\n", + (long)getpid()); + } + + if (am_daemon && lp_write_only(module_id) && am_sender) { + rprintf(FERROR, "ERROR: module is write only\n"); + exit_cleanup(RERR_SYNTAX); + return; + } + + if (!relative_paths && !push_dir(dir)) { + rsyserr(FERROR, errno, "push_dir#3 %s failed", + full_fname(dir)); + exit_cleanup(RERR_FILESELECT); + } + argc--; + argv++; + + if (strcmp(dir,".")) { + int l = strlen(dir); + if (strcmp(dir,"/") == 0) + l = 0; + for (i=0;icount == 0) { + exit_cleanup(0); + } + + io_start_buffering_in(f_in); + io_start_buffering_out(f_out); + send_files(flist,f_out,f_in); + io_flush(FULL_FLUSH); + report(f_out); + if (protocol_version >= 24) { + /* final goodbye message */ + read_int(f_in); + } + io_flush(FULL_FLUSH); + exit_cleanup(0); } static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name) { - int pid; - int status=0; - int recv_pipe[2]; + int pid; + int status=0; + int error_pipe[2]; + + if (preserve_hard_links) + init_hard_links(flist); + + if (!delete_after) { + /* I moved this here from recv_files() to prevent a race condition */ + if (recurse && delete_mode && !local_name && flist->count>0) { + delete_files(flist); + } + } + + if (fd_pair(error_pipe) < 0) { + rprintf(FERROR,"error pipe failed in do_recv\n"); + exit_cleanup(RERR_SOCKETIO); + } + + io_flush(NORMAL_FLUSH); + + if ((pid=do_fork()) == 0) { + close(error_pipe[0]); + if (f_in != f_out) close(f_out); + + /* we can't let two processes write to the socket at one time */ + io_multiplexing_close(); + + /* set place to send errors */ + set_msg_fd_out(error_pipe[1]); + + recv_files(f_in,flist,local_name); + io_flush(FULL_FLUSH); + report(f_in); + + send_msg(MSG_DONE, "", 0); + io_flush(FULL_FLUSH); + /* finally we go to sleep until our parent kills us + * with a USR2 signal. We sleep for a short time as on + * some OSes a signal won't interrupt a sleep! */ + while (1) + msleep(20); + } + + am_generator = 1; - if (preserve_hard_links) - init_hard_links(flist); + close(error_pipe[1]); + if (f_in != f_out) close(f_in); - if (pipe(recv_pipe) < 0) { - rprintf(FERROR,"pipe failed in do_recv\n"); - exit(1); - } - + io_start_buffering_out(f_out); - if ((pid=do_fork()) == 0) { - recv_files(f_in,flist,local_name,recv_pipe[1]); - if (verbose > 2) - rprintf(FINFO,"receiver read %ld\n",(long)read_total()); - exit_cleanup(0); - } + set_msg_fd_in(error_pipe[0]); - generate_files(f_out,flist,local_name,recv_pipe[0]); + generate_files(f_out, flist, local_name); - waitpid(pid, &status, 0); + get_redo_num(); /* Read final MSG_DONE and any prior messages. */ + report(-1); + io_flush(FULL_FLUSH); + if (protocol_version >= 24) { + /* send a final goodbye message */ + write_int(f_out, -1); + } + io_flush(FULL_FLUSH); - return status; + set_msg_fd_in(-1); + kill(pid, SIGUSR2); + wait_process(pid, &status); + return status; } static void do_server_recv(int f_in, int f_out, int argc,char *argv[]) { - int status; - struct file_list *flist; - char *local_name=NULL; - char *dir = NULL; - - if (verbose > 2) - rprintf(FINFO,"server_recv(%d) starting pid=%d\n",argc,(int)getpid()); - - if (am_daemon) { - char *name = lp_name(module_id); - int i, l = strlen(name); - for (i=0;i 0) { - dir = argv[0]; - argc--; - argv++; - if (!am_daemon && chdir(dir) != 0) { - rprintf(FERROR,"chdir %s : %s (4)\n", - dir,strerror(errno)); - exit_cleanup(1); - } - } - - if (delete_mode) - recv_exclude_list(f_in); - - flist = recv_file_list(f_in); - if (!flist || flist->count == 0) { - rprintf(FERROR,"nothing to do\n"); - exit_cleanup(1); - } - - if (argc > 0) { - if (strcmp(dir,".")) { - argv[0] += strlen(dir); - if (argv[0][0] == '/') argv[0]++; - } - local_name = get_local_name(flist,argv[0]); - } - - status = do_recv(f_in,f_out,flist,local_name); - exit_cleanup(status); + int status; + struct file_list *flist; + char *local_name = NULL; + char *dir = NULL; + + if (verbose > 2) { + rprintf(FINFO, "server_recv(%d) starting pid=%ld\n", + argc, (long)getpid()); + } + + if (am_daemon && lp_read_only(module_id) && !am_sender) { + rprintf(FERROR,"ERROR: module is read only\n"); + exit_cleanup(RERR_SYNTAX); + return; + } + + + if (argc > 0) { + dir = argv[0]; + argc--; + argv++; + if (!am_daemon && !push_dir(dir)) { + rsyserr(FERROR, errno, "push_dir#4 %s failed", + full_fname(dir)); + exit_cleanup(RERR_FILESELECT); + } + } + + io_start_buffering_in(f_in); + if (delete_mode && !delete_excluded) + recv_exclude_list(f_in); + + if (filesfrom_fd >= 0) { + /* We're receiving the file info from the sender, so we need + * the IO routines to automatically write out the names onto + * our f_out socket as we read the list info from the sender. + * This avoids both deadlock and extra delays/buffers. */ + io_set_filesfrom_fds(filesfrom_fd, f_out); + filesfrom_fd = -1; + } + + if (read_batch) + flist = batch_flist; + else + flist = recv_file_list(f_in); + if (!flist) { + rprintf(FERROR,"server_recv: recv_file_list error\n"); + exit_cleanup(RERR_FILESELECT); + } + + if (argc > 0) { + if (strcmp(dir,".")) { + argv[0] += strlen(dir); + if (argv[0][0] == '/') argv[0]++; + } + local_name = get_local_name(flist,argv[0]); + } + + status = do_recv(f_in,f_out,flist,local_name); + exit_cleanup(status); +} + + +int child_main(int argc, char *argv[]) +{ + start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv); + return 0; } void start_server(int f_in, int f_out, int argc, char *argv[]) { - setup_protocol(f_out, f_in); - - if (am_sender) { - recv_exclude_list(f_in); - if (cvs_exclude) - add_cvs_excludes(); - do_server_sender(f_in, f_out, argc, argv); - } else { - do_server_recv(f_in, f_out, argc, argv); - } - exit_cleanup(0); + setup_protocol(f_out, f_in); + + set_nonblocking(f_in); + set_nonblocking(f_out); + + if (protocol_version >= 23) + io_start_multiplex_out(f_out); + + if (am_sender) { + if (!read_batch) { + recv_exclude_list(f_in); + if (cvs_exclude) + add_cvs_excludes(); + } + do_server_sender(f_in, f_out, argc, argv); + } else { + do_server_recv(f_in, f_out, argc, argv); + } + exit_cleanup(0); } -static int client_run(int f_in, int f_out, int pid, int argc, char *argv[]) + +/* + * This is called once the connection has been negotiated. It is used + * for rsyncd, remote-shell, and local connections. + */ +int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[]) { - struct file_list *flist; + struct file_list *flist = NULL; int status = 0, status2 = 0; char *local_name = NULL; + cleanup_child_pid = pid; + if (read_batch) + flist = batch_flist; + + set_nonblocking(f_in); + set_nonblocking(f_out); + setup_protocol(f_out,f_in); - + + if (protocol_version >= 23) + io_start_multiplex_in(f_in); + if (am_sender) { + io_start_buffering_out(f_out); if (cvs_exclude) add_cvs_excludes(); - if (delete_mode) + if (delete_mode && !delete_excluded) send_exclude_list(f_out); - flist = send_file_list(f_out,argc,argv); - if (verbose > 3) + if (remote_filesfrom_file) + filesfrom_fd = f_in; + if (!read_batch) /* don't write to pipe */ + flist = send_file_list(f_out,argc,argv); + if (verbose > 3) rprintf(FINFO,"file list sent\n"); + + io_flush(NORMAL_FLUSH); send_files(flist,f_out,f_in); + io_flush(FULL_FLUSH); + if (protocol_version >= 24) { + /* final goodbye message */ + read_int(f_in); + } if (pid != -1) { if (verbose > 3) - rprintf(FINFO,"waiting on %d\n",pid); - waitpid(pid, &status, 0); + rprintf(FINFO,"client_run waiting on %d\n", (int) pid); + io_flush(FULL_FLUSH); + wait_process(pid, &status); } report(-1); + io_flush(FULL_FLUSH); exit_cleanup(status); } - - send_exclude_list(f_out); - - flist = recv_file_list(f_in); - if (!flist || flist->count == 0) { - rprintf(FINFO,"nothing to do\n"); - exit_cleanup(0); - } - - local_name = get_local_name(flist,argv[0]); - - status2 = do_recv(f_in,f_out,flist,local_name); - - report(f_in); - - if (pid != -1) { - waitpid(pid, &status, 0); - } - - return status | status2; -} + if (argc == 0) + list_only = 1; -int start_socket_client(char *host, char *path, int argc, char *argv[]) -{ - int fd, i; - char *sargs[MAX_ARGS]; - int sargc=0; - char line[1024]; - char *p; - int version; + if (!read_batch) + send_exclude_list(f_out); - fd = open_socket_out(host, port); - if (fd == -1) { - exit_cleanup(1); + if (filesfrom_fd >= 0) { + io_set_filesfrom_fds(filesfrom_fd, f_out); + filesfrom_fd = -1; } - - server_options(sargs,&sargc); - - sargs[sargc++] = "."; - if (path && *path) - sargs[sargc++] = path; - - sargs[sargc] = NULL; + flist = recv_file_list(f_in); + if (!flist || flist->count == 0) { + rprintf(FINFO, "client: nothing to do: " + "perhaps you need to specify some filenames or " + "the --recursive option?\n"); + exit_cleanup(0); + } - p = strchr(path,'/'); - if (p) *p = 0; - io_printf(fd,"%s\n",path); - if (p) *p = '/'; + local_name = get_local_name(flist,argv[0]); - if (!read_line(fd, line, sizeof(line)-1)) { - return -1; - } + status2 = do_recv(f_in,f_out,flist,local_name); - if (sscanf(line,"RSYNCD %d", &version) != 1) { - return -1; + if (pid != -1) { + if (verbose > 3) + rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid); + io_flush(FULL_FLUSH); + wait_process(pid, &status); } - while (1) { - if (!read_line(fd, line, sizeof(line)-1)) { - return -1; - } - if (strcmp(line,"RSYNCD: OK") == 0) break; - rprintf(FINFO,"%s\n", line); - } + return MAX(status, status2); +} - for (i=0;i 1) { + usage(FERROR); + exit_cleanup(RERR_SYNTAX); } - if (setgid(lp_gid(i))) { - io_printf(fd,"ERROR: setgid failed\n"); - return -1; + if (argc == 0 && !am_sender) { + list_only = 1; } - if (setuid(lp_uid(i))) { - io_printf(fd,"ERROR: setuid failed\n"); - return -1; + pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path, + &f_in,&f_out); + + /* if we're running an rsync server on the remote host over a + * remote shell command, we need to do the RSYNCD protocol first */ + if (daemon_over_rsh) { + int tmpret; + tmpret = start_inband_exchange(shell_user, shell_path, + f_in, f_out, argc); + if (tmpret < 0) + return tmpret; } - io_printf(fd,"RSYNCD: OK\n"); + ret = client_run(f_in, f_out, pid, argc, argv); - argv[argc++] = "rsyncd"; - - while (1) { - if (!read_line(fd, line, sizeof(line)-1)) { - return -1; - } + fflush(stdout); + fflush(stderr); - if (!*line) break; - - argv[argc] = strdup(line); - if (!argv[argc]) { - return -1; - } - - argc++; - if (argc == MAX_ARGS) { - return -1; - } - } - - parse_arguments(argc, argv); - - /* don't allow the logs to be flooded too fast */ - if (verbose > 1) verbose = 1; - - argc -= optind; - argp = argv + optind; - optind = 0; + return ret; +} - start_server(fd, fd, argc, argp); - return 0; +static RETSIGTYPE sigusr1_handler(UNUSED(int val)) +{ + exit_cleanup(RERR_SIGNAL); } -static void send_listing(int fd) +static RETSIGTYPE sigusr2_handler(UNUSED(int val)) { - int n = lp_numservices(); - int i; - - for (i=0;i 0) { - line[len] = 0; - io_printf(fd,"%s", line); +#ifdef WNOHANG + int cnt, status; + pid_t pid; + /* An empty waitpid() loop was put here by Tridge and we could never + * get him to explain why he put it in, so rather than taking it + * out we're instead saving the child exit statuses for later use. + * The waitpid() loop presumably eliminates all possibility of leaving + * zombie children, maybe that's why he did it. + */ + while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { + /* save the child's exit status */ + for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) { + if (pid_stat_table[cnt].pid == 0) { + pid_stat_table[cnt].pid = pid; + pid_stat_table[cnt].status = status; + break; } } - if (f) fclose(f); - io_printf(fd,"\n"); } +#endif +} - /* read a single line indicating the resource that is wanted */ - while (1) { - int i; - line[0] = 0; - if (!read_line(fd, line, sizeof(line)-1)) { - return -1; - } +/** + * This routine catches signals and tries to send them to gdb. + * + * Because it's called from inside a signal handler it ought not to + * use too many library routines. + * + * @todo Perhaps use "screen -X" instead/as well, to help people + * debugging without easy access to X. Perhaps use an environment + * variable, or just call a script? + * + * @todo The /proc/ magic probably only works on Linux (and + * Solaris?) Can we be more portable? + **/ +#ifdef MAINTAINER_MODE +const char *get_panic_action(void) +{ + const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION"); - if (!*line || strcmp(line,"#list")==0) { - send_listing(fd); - return -1; - } + if (cmd_fmt) + return cmd_fmt; + else + return "xterm -display :0 -T Panic -n Panic " + "-e gdb /proc/%d/exe %d"; +} - if (*line == '#') { - /* it's some sort of command that I don't understand */ - io_printf(fd,"ERROR: Unknown command '%s'\n", line); - return -1; - } - i = lp_number(line); - if (i == -1) { - io_printf(fd,"ERROR: Unknown module '%s'\n", line); - return -1; - } +/** + * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION. + * + * This signal handler is only installed if we were configured with + * --enable-maintainer-mode. Perhaps it should always be on and we + * should just look at the environment variable, but I'm a bit leery + * of a signal sending us into a busy loop. + **/ +static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig)) +{ + char cmd_buf[300]; + int ret; - return rsync_module(fd, i); - } + sprintf(cmd_buf, get_panic_action(), + getpid(), getpid()); - return 0; + /* Unless we failed to execute gdb, we allow the process to + * continue. I'm not sure if that's right. */ + ret = system(cmd_buf); + if (ret) + _exit(ret); } +#endif -static int daemon_main(void) +int main(int argc,char *argv[]) { - if (!lp_load(RSYNCD_CONF)) { - exit_cleanup(1); - } + int ret; + int orig_argc; + char **orig_argv; - if (is_a_socket(STDIN_FILENO)) { - /* we are running via inetd */ - return start_daemon(STDIN_FILENO); - } + orig_argc = argc; + orig_argv = argv; - become_daemon(); + signal(SIGUSR1, sigusr1_handler); + signal(SIGUSR2, sigusr2_handler); + signal(SIGCHLD, sigchld_handler); +#ifdef MAINTAINER_MODE + signal(SIGSEGV, rsync_panic_handler); + signal(SIGFPE, rsync_panic_handler); + signal(SIGABRT, rsync_panic_handler); + signal(SIGBUS, rsync_panic_handler); +#endif /* def MAINTAINER_MODE */ - return start_accept_loop(port, start_daemon); -} + starttime = time(NULL); + am_root = (MY_UID() == 0); -int main(int argc,char *argv[]) -{ + memset(&stats, 0, sizeof(stats)); + + if (argc < 2) { + usage(FERROR); + exit_cleanup(RERR_SYNTAX); + } + + /* we set a 0 umask so that correct file permissions can be + * carried across */ + orig_umask = (int)umask(0); - signal(SIGUSR1, sigusr1_handler); + if (!parse_arguments(&argc, (const char ***) &argv, 1)) { + /* FIXME: We ought to call the same error-handling + * code here, rather than relying on getopt. */ + option_error(); + exit_cleanup(RERR_SYNTAX); + } - starttime = time(NULL); - am_root = (getuid() == 0); + signal(SIGINT,SIGNAL_CAST sig_int); + signal(SIGHUP,SIGNAL_CAST sig_int); + signal(SIGTERM,SIGNAL_CAST sig_int); - /* we set a 0 umask so that correct file permissions can be - carried across */ - orig_umask = (int)umask(0); + /* Ignore SIGPIPE; we consistently check error codes and will + * see the EPIPE. */ + signal(SIGPIPE, SIG_IGN); - parse_arguments(argc, argv); + /* Initialize push_dir here because on some old systems getcwd + * (implemented by forking "pwd" and reading its output) doesn't + * work when there are other child processes. Also, on all systems + * that implement getcwd that way "pwd" can't be found after chroot. */ + push_dir(NULL); - argc -= optind; - argv += optind; - optind = 0; + init_flist(); - signal(SIGCHLD,SIG_IGN); - signal(SIGINT,SIGNAL_CAST sig_int); - signal(SIGPIPE,SIGNAL_CAST sig_int); - signal(SIGHUP,SIGNAL_CAST sig_int); + if (write_batch && !am_server) { + write_batch_argvs_file(orig_argc, orig_argv); + } - if (am_daemon) { - return daemon_main(); - } + if (am_daemon && !am_server) + return daemon_main(); - if (dry_run) - verbose = MAX(verbose,1); + if (argc < 1) { + usage(FERROR); + exit_cleanup(RERR_SYNTAX); + } -#ifndef SUPPORT_LINKS - if (!am_server && preserve_links) { - rprintf(FERROR,"ERROR: symbolic links not supported\n"); - exit_cleanup(1); - } -#endif + if (dry_run) + verbose = MAX(verbose,1); - if (am_server) { - start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv); - } + if (am_server) { + set_nonblocking(STDIN_FILENO); + set_nonblocking(STDOUT_FILENO); + if (am_daemon) + return start_daemon(STDIN_FILENO, STDOUT_FILENO); + start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv); + } - if (argc < 2) { - usage(FERROR); - exit_cleanup(1); - } + ret = start_client(argc, argv); + if (ret == -1) + exit_cleanup(RERR_STARTCLIENT); + else + exit_cleanup(ret); - return start_client(argc, argv); + return ret; } -