cleanup.c

   1 /*
   2  * End-of-run cleanup routines.
   3  *
   4  * Copyright (C) 1996-2000 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2002 Martin Pool
   7  * Copyright (C) 2003-2013 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24
  25 extern int am_server;
  26 extern int am_daemon;
  27 extern int am_receiver;
  28 extern int io_error;
  29 extern int keep_partial;
  30 extern int got_xfer_error;
  31 extern int protocol_version;
  32 extern int output_needs_newline;
  33 extern char *partial_dir;
  34 extern char *logfile_name;
  35
  36 BOOL shutting_down = False;
  37 BOOL flush_ok_after_signal = False;
  38
  39 #ifdef HAVE_SIGACTION
  40 static struct sigaction sigact;
  41 #endif
  42
  43 /**
  44  * Close all open sockets and files, allowing a (somewhat) graceful
  45  * shutdown() of socket connections.  This eliminates the abortive
  46  * TCP RST sent by a Winsock-based system when the close() occurs.
  47  **/
  48 void close_all(void)
  49 {
  50 #ifdef SHUTDOWN_ALL_SOCKETS
  51         int max_fd;
  52         int fd;
  53         int ret;
  54         STRUCT_STAT st;
  55
  56         max_fd = sysconf(_SC_OPEN_MAX) - 1;
  57         for (fd = max_fd; fd >= 0; fd--) {
  58                 if ((ret = do_fstat(fd, &st)) == 0) {
  59                         if (is_a_socket(fd))
  60                                 ret = shutdown(fd, 2);
  61                         ret = close(fd);
  62                 }
  63         }
  64 #endif
  65 }
  66
  67 /**
  68  * @file cleanup.c
  69  *
  70  * Code for handling interrupted transfers.  Depending on the @c
  71  * --partial option, we may either delete the temporary file, or go
  72  * ahead and overwrite the destination.  This second behaviour only
  73  * occurs if we've sent literal data and therefore hopefully made
  74  * progress on the transfer.
  75  **/
  76
  77 /**
  78  * Set to True once literal data has been sent across the link for the
  79  * current file. (????)
  80  *
  81  * Handling the cleanup when a transfer is interrupted is tricky when
  82  * --partial is selected.  We need to ensure that the partial file is
  83  * kept if any real data has been transferred.
  84  **/
  85 int cleanup_got_literal = 0;
  86
  87 static const char *cleanup_fname;
  88 static const char *cleanup_new_fname;
  89 static struct file_struct *cleanup_file;
  90 static int cleanup_fd_r, cleanup_fd_w;
  91 static pid_t cleanup_pid = 0;
  92
  93 pid_t cleanup_child_pid = -1;
  94
  95 /**
  96  * Eventually calls exit(), passing @p code, therefore does not return.
  97  *
  98  * @param code one of the RERR_* codes from errcode.h.
  99  **/
 100 NORETURN void _exit_cleanup(int code, const char *file, int line)
 101 {
 102         static int switch_step = 0;
 103         static int exit_code = 0, exit_line = 0;
 104         static const char *exit_file = NULL;
 105         static int unmodified_code = 0;
 106
 107         SIGACTION(SIGUSR1, SIG_IGN);
 108         SIGACTION(SIGUSR2, SIG_IGN);
 109
 110         if (exit_code) { /* Preserve first exit info when recursing. */
 111                 code = exit_code;
 112                 file = exit_file;
 113                 line = exit_line;
 114         }
 115
 116         /* If this is the exit at the end of the run, the server side
 117          * should not attempt to output a message (see log_exit()). */
 118         if (am_server && code == 0)
 119                 am_server = 2;
 120
 121         /* Some of our actions might cause a recursive call back here, so we
 122          * keep track of where we are in the cleanup and never repeat a step. */
 123         switch (switch_step) {
 124 #include "case_N.h" /* case 0: */
 125                 switch_step++;
 126
 127                 exit_code = unmodified_code = code;
 128                 exit_file = file;
 129                 exit_line = line;
 130
 131                 if (output_needs_newline) {
 132                         fputc('\n', stdout);
 133                         output_needs_newline = 0;
 134                 }
 135
 136                 if (DEBUG_GTE(EXIT, 2)) {
 137                         rprintf(FINFO,
 138                                 "[%s] _exit_cleanup(code=%d, file=%s, line=%d): entered\n",
 139                                 who_am_i(), code, file, line);
 140                 }
 141
 142                 /* FALLTHROUGH */
 143 #include "case_N.h"
 144                 switch_step++;
 145
 146                 if (cleanup_child_pid != -1) {
 147                         int status;
 148                         int pid = wait_process(cleanup_child_pid, &status, WNOHANG);
 149                         if (pid == cleanup_child_pid) {
 150                                 status = WEXITSTATUS(status);
 151                                 if (status > code)
 152                                         code = exit_code = status;
 153                         }
 154                 }
 155
 156                 /* FALLTHROUGH */
 157 #include "case_N.h"
 158                 switch_step++;
 159
 160                 if (cleanup_got_literal && cleanup_fname && cleanup_new_fname
 161                  && keep_partial && handle_partial_dir(cleanup_new_fname, PDIR_CREATE)) {
 162                         int tweak_modtime = 0;
 163                         const char *fname = cleanup_fname;
 164                         cleanup_fname = NULL;
 165                         if (cleanup_fd_r != -1)
 166                                 close(cleanup_fd_r);
 167                         if (cleanup_fd_w != -1) {
 168                                 flush_write_file(cleanup_fd_w);
 169                                 close(cleanup_fd_w);
 170                         }
 171                         if (!partial_dir) {
 172                             /* We don't want to leave a partial file with a modern time or it
 173                              * could be skipped via --update.  Setting the time to something
 174                              * really old also helps it to stand out as unfinished in an ls. */
 175                             tweak_modtime = 1;
 176                             cleanup_file->modtime = 0;
 177                         }
 178                         finish_transfer(cleanup_new_fname, fname, NULL, NULL,
 179                                         cleanup_file, tweak_modtime, !partial_dir);
 180                 }
 181
 182                 /* FALLTHROUGH */
 183 #include "case_N.h"
 184                 switch_step++;
 185
 186                 if (flush_ok_after_signal) {
 187                         flush_ok_after_signal = False;
 188                         if (code == RERR_SIGNAL)
 189                                 io_flush(FULL_FLUSH);
 190                 }
 191                 if (!code)
 192                         io_flush(FULL_FLUSH);
 193
 194                 /* FALLTHROUGH */
 195 #include "case_N.h"
 196                 switch_step++;
 197
 198                 if (cleanup_fname)
 199                         do_unlink(cleanup_fname);
 200                 if (code)
 201                         kill_all(SIGUSR1);
 202                 if (cleanup_pid && cleanup_pid == getpid()) {
 203                         char *pidf = lp_pid_file();
 204                         if (pidf && *pidf)
 205                                 unlink(lp_pid_file());
 206                 }
 207
 208                 if (code == 0) {
 209                         if (io_error & IOERR_DEL_LIMIT)
 210                                 code = exit_code = RERR_DEL_LIMIT;
 211                         if (io_error & IOERR_VANISHED)
 212                                 code = exit_code = RERR_VANISHED;
 213                         if (io_error & IOERR_GENERAL || got_xfer_error)
 214                                 code = exit_code = RERR_PARTIAL;
 215                 }
 216
 217                 /* If line < 0, this exit is after a MSG_ERROR_EXIT event, so
 218                  * we don't want to output a duplicate error. */
 219                 if ((code && line > 0)
 220                  || am_daemon || (logfile_name && (am_server || !INFO_GTE(STATS, 1))))
 221                         log_exit(code, file, line);
 222
 223                 /* FALLTHROUGH */
 224 #include "case_N.h"
 225                 switch_step++;
 226
 227                 if (DEBUG_GTE(EXIT, 1)) {
 228                         rprintf(FINFO,
 229                                 "[%s] _exit_cleanup(code=%d, file=%s, line=%d): "
 230                                 "about to call exit(%d)\n",
 231                                 who_am_i(), unmodified_code, file, line, code);
 232                 }
 233
 234                 /* FALLTHROUGH */
 235 #include "case_N.h"
 236                 switch_step++;
 237
 238                 if (exit_code && exit_code != RERR_SOCKETIO && exit_code != RERR_STREAMIO && exit_code != RERR_SIGNAL1
 239                  && exit_code != RERR_TIMEOUT && !shutting_down && (protocol_version >= 31 || am_receiver)) {
 240                         if (line > 0) {
 241                                 if (DEBUG_GTE(EXIT, 3)) {
 242                                         rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT with exit_code %d\n",
 243                                                 who_am_i(), exit_code);
 244                                 }
 245                                 send_msg_int(MSG_ERROR_EXIT, exit_code);
 246                         }
 247                         noop_io_until_death();
 248                 }
 249
 250                 /* FALLTHROUGH */
 251 #include "case_N.h"
 252                 switch_step++;
 253
 254                 if (am_server && code)
 255                         msleep(100);
 256                 close_all();
 257
 258                 /* FALLTHROUGH */
 259         default:
 260                 break;
 261         }
 262
 263         exit(code);
 264 }
 265
 266 void cleanup_disable(void)
 267 {
 268         cleanup_fname = cleanup_new_fname = NULL;
 269         cleanup_got_literal = 0;
 270 }
 271
 272
 273 void cleanup_set(const char *fnametmp, const char *fname, struct file_struct *file,
 274                  int fd_r, int fd_w)
 275 {
 276         cleanup_fname = fnametmp;
 277         cleanup_new_fname = fname; /* can be NULL on a partial-dir failure */
 278         cleanup_file = file;
 279         cleanup_fd_r = fd_r;
 280         cleanup_fd_w = fd_w;
 281 }
 282
 283 void cleanup_set_pid(pid_t pid)
 284 {
 285         cleanup_pid = pid;
 286 }