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, 2004, 2005, 2006 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 2 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, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25
  26 extern int am_server;
  27 extern int am_daemon;
  28 extern int io_error;
  29 extern int keep_partial;
  30 extern int log_got_error;
  31 extern char *partial_dir;
  32 extern char *logfile_name;
  33
  34 #ifdef HAVE_SIGACTION
  35 static struct sigaction sigact;
  36 #endif
  37
  38 /**
  39  * Close all open sockets and files, allowing a (somewhat) graceful
  40  * shutdown() of socket connections.  This eliminates the abortive
  41  * TCP RST sent by a Winsock-based system when the close() occurs.
  42  **/
  43 void close_all(void)
  44 {
  45 #ifdef SHUTDOWN_ALL_SOCKETS
  46         int max_fd;
  47         int fd;
  48         int ret;
  49         STRUCT_STAT st;
  50
  51         max_fd = sysconf(_SC_OPEN_MAX) - 1;
  52         for (fd = max_fd; fd >= 0; fd--) {
  53                 if ((ret = do_fstat(fd, &st)) == 0) {
  54                         if (is_a_socket(fd))
  55                                 ret = shutdown(fd, 2);
  56                         ret = close(fd);
  57                 }
  58         }
  59 #endif
  60 }
  61
  62 /**
  63  * @file cleanup.c
  64  *
  65  * Code for handling interrupted transfers.  Depending on the @c
  66  * --partial option, we may either delete the temporary file, or go
  67  * ahead and overwrite the destination.  This second behaviour only
  68  * occurs if we've sent literal data and therefore hopefully made
  69  * progress on the transfer.
  70  **/
  71
  72 /**
  73  * Set to True once literal data has been sent across the link for the
  74  * current file. (????)
  75  *
  76  * Handling the cleanup when a transfer is interrupted is tricky when
  77  * --partial is selected.  We need to ensure that the partial file is
  78  * kept if any real data has been transferred.
  79  **/
  80 int cleanup_got_literal = 0;
  81
  82 static char *cleanup_fname;
  83 static char *cleanup_new_fname;
  84 static struct file_struct *cleanup_file;
  85 static int cleanup_fd_r, cleanup_fd_w;
  86 static pid_t cleanup_pid = 0;
  87
  88 pid_t cleanup_child_pid = -1;
  89
  90 /**
  91  * Eventually calls exit(), passing @p code, therefore does not return.
  92  *
  93  * @param code one of the RERR_* codes from errcode.h.
  94  **/
  95 NORETURN void _exit_cleanup(int code, const char *file, int line)
  96 {
  97         static int cleanup_step = 0;
  98         static int exit_code = 0;
  99         static int unmodified_code = 0;
 100
 101         SIGACTION(SIGUSR1, SIG_IGN);
 102         SIGACTION(SIGUSR2, SIG_IGN);
 103
 104         if (exit_code) /* Preserve first error code when recursing. */
 105                 code = exit_code;
 106
 107         /* Some of our actions might cause a recursive call back here, so we
 108          * keep track of where we are in the cleanup and never repeat a step. */
 109         switch (cleanup_step) {
 110         case 0:
 111                 cleanup_step++;
 112
 113                 exit_code = unmodified_code = code;
 114
 115                 if (verbose > 3) {
 116                         rprintf(FINFO,
 117                                 "_exit_cleanup(code=%d, file=%s, line=%d): entered\n",
 118                                 code, file, line);
 119                 }
 120
 121                 /* FALLTHROUGH */
 122         case 1:
 123                 cleanup_step++;
 124
 125                 if (cleanup_child_pid != -1) {
 126                         int status;
 127                         int pid = wait_process(cleanup_child_pid, &status, WNOHANG);
 128                         if (pid == cleanup_child_pid) {
 129                                 status = WEXITSTATUS(status);
 130                                 if (status > code)
 131                                         code = exit_code = status;
 132                         }
 133                 }
 134
 135                 /* FALLTHROUGH */
 136         case 2:
 137                 cleanup_step++;
 138
 139                 if (cleanup_got_literal && cleanup_fname && cleanup_new_fname
 140                  && keep_partial && handle_partial_dir(cleanup_new_fname, PDIR_CREATE)) {
 141                         char *fname = cleanup_fname;
 142                         cleanup_fname = NULL;
 143                         if (cleanup_fd_r != -1)
 144                                 close(cleanup_fd_r);
 145                         if (cleanup_fd_w != -1) {
 146                                 flush_write_file(cleanup_fd_w);
 147                                 close(cleanup_fd_w);
 148                         }
 149                         finish_transfer(cleanup_new_fname, fname, NULL,
 150                                         cleanup_file, 0, !partial_dir);
 151                 }
 152
 153                 /* FALLTHROUGH */
 154         case 3:
 155                 cleanup_step++;
 156
 157                 io_flush(FULL_FLUSH);
 158
 159                 /* FALLTHROUGH */
 160         case 4:
 161                 cleanup_step++;
 162
 163                 if (cleanup_fname)
 164                         do_unlink(cleanup_fname);
 165                 if (code)
 166                         kill_all(SIGUSR1);
 167                 if (cleanup_pid && cleanup_pid == getpid()) {
 168                         char *pidf = lp_pid_file();
 169                         if (pidf && *pidf)
 170                                 unlink(lp_pid_file());
 171                 }
 172
 173                 if (code == 0) {
 174                         if (io_error & IOERR_DEL_LIMIT)
 175                                 code = exit_code = RERR_DEL_LIMIT;
 176                         if (io_error & IOERR_VANISHED)
 177                                 code = exit_code = RERR_VANISHED;
 178                         if (io_error & IOERR_GENERAL || log_got_error)
 179                                 code = exit_code = RERR_PARTIAL;
 180                 }
 181
 182                 if (code || am_daemon || (logfile_name && (am_server || !verbose)))
 183                         log_exit(code, file, line);
 184
 185                 /* FALLTHROUGH */
 186         case 5:
 187                 cleanup_step++;
 188
 189                 if (verbose > 2) {
 190                         rprintf(FINFO,
 191                                 "_exit_cleanup(code=%d, file=%s, line=%d): "
 192                                 "about to call exit(%d)\n",
 193                                 unmodified_code, file, line, code);
 194                 }
 195
 196                 /* FALLTHROUGH */
 197         case 6:
 198                 cleanup_step++;
 199
 200                 close_all();
 201
 202                 /* FALLTHROUGH */
 203         default:
 204                 break;
 205         }
 206
 207         exit(code);
 208 }
 209
 210 void cleanup_disable(void)
 211 {
 212         cleanup_fname = cleanup_new_fname = NULL;
 213         cleanup_got_literal = 0;
 214 }
 215
 216
 217 void cleanup_set(char *fnametmp, char *fname, struct file_struct *file,
 218                  int fd_r, int fd_w)
 219 {
 220         cleanup_fname = fnametmp;
 221         cleanup_new_fname = fname; /* can be NULL on a partial-dir failure */
 222         cleanup_file = file;
 223         cleanup_fd_r = fd_r;
 224         cleanup_fd_w = fd_w;
 225 }
 226
 227 void cleanup_set_pid(pid_t pid)
 228 {
 229         cleanup_pid = pid;
 230 }