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) 2003-2007 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 io_error;
  28 extern int keep_partial;
  29 extern int log_got_error;
  30 extern char *partial_dir;
  31 extern char *logfile_name;
  32
  33 #ifdef HAVE_SIGACTION
  34 static struct sigaction sigact;
  35 #endif
  36
  37 /**
  38  * Close all open sockets and files, allowing a (somewhat) graceful
  39  * shutdown() of socket connections.  This eliminates the abortive
  40  * TCP RST sent by a Winsock-based system when the close() occurs.
  41  **/
  42 void close_all(void)
  43 {
  44 #ifdef SHUTDOWN_ALL_SOCKETS
  45         int max_fd;
  46         int fd;
  47         int ret;
  48         STRUCT_STAT st;
  49
  50         max_fd = sysconf(_SC_OPEN_MAX) - 1;
  51         for (fd = max_fd; fd >= 0; fd--) {
  52                 if ((ret = do_fstat(fd, &st)) == 0) {
  53                         if (is_a_socket(fd))
  54                                 ret = shutdown(fd, 2);
  55                         ret = close(fd);
  56                 }
  57         }
  58 #endif
  59 }
  60
  61 /**
  62  * @file cleanup.c
  63  *
  64  * Code for handling interrupted transfers.  Depending on the @c
  65  * --partial option, we may either delete the temporary file, or go
  66  * ahead and overwrite the destination.  This second behaviour only
  67  * occurs if we've sent literal data and therefore hopefully made
  68  * progress on the transfer.
  69  **/
  70
  71 /**
  72  * Set to True once literal data has been sent across the link for the
  73  * current file. (????)
  74  *
  75  * Handling the cleanup when a transfer is interrupted is tricky when
  76  * --partial is selected.  We need to ensure that the partial file is
  77  * kept if any real data has been transferred.
  78  **/
  79 int cleanup_got_literal = 0;
  80
  81 static const char *cleanup_fname;
  82 static const char *cleanup_new_fname;
  83 static struct file_struct *cleanup_file;
  84 static int cleanup_fd_r, cleanup_fd_w;
  85 static pid_t cleanup_pid = 0;
  86
  87 pid_t cleanup_child_pid = -1;
  88
  89 /**
  90  * Eventually calls exit(), passing @p code, therefore does not return.
  91  *
  92  * @param code one of the RERR_* codes from errcode.h.
  93  **/
  94 NORETURN void _exit_cleanup(int code, const char *file, int line)
  95 {
  96         static int cleanup_step = 0;
  97         static int exit_code = 0;
  98         static int unmodified_code = 0;
  99
 100         SIGACTION(SIGUSR1, SIG_IGN);
 101         SIGACTION(SIGUSR2, SIG_IGN);
 102
 103         if (exit_code) /* Preserve first error code when recursing. */
 104                 code = exit_code;
 105
 106         /* If this is the exit at the end of the run, the server side
 107          * should not attempt to output a message (see log.c). */
 108         if (am_server && code == 0)
 109                 am_server = 2;
 110
 111         /* Some of our actions might cause a recursive call back here, so we
 112          * keep track of where we are in the cleanup and never repeat a step. */
 113         switch (cleanup_step) {
 114 #include "case_N.h" /* case 0: cleanup_step++; */
 115
 116                 exit_code = unmodified_code = code;
 117
 118                 if (verbose > 3) {
 119                         rprintf(FINFO,
 120                                 "_exit_cleanup(code=%d, file=%s, line=%d): entered\n",
 121                                 code, file, line);
 122                 }
 123
 124                 /* FALLTHROUGH */
 125 #include "case_N.h"
 126
 127                 if (cleanup_child_pid != -1) {
 128                         int status;
 129                         int pid = wait_process(cleanup_child_pid, &status, WNOHANG);
 130                         if (pid == cleanup_child_pid) {
 131                                 status = WEXITSTATUS(status);
 132                                 if (status > code)
 133                                         code = exit_code = status;
 134                         }
 135                 }
 136
 137                 /* FALLTHROUGH */
 138 #include "case_N.h"
 139
 140                 if (cleanup_got_literal && cleanup_fname && cleanup_new_fname
 141                  && keep_partial && handle_partial_dir(cleanup_new_fname, PDIR_CREATE)) {
 142                         const char *fname = cleanup_fname;
 143                         cleanup_fname = NULL;
 144                         if (cleanup_fd_r != -1)
 145                                 close(cleanup_fd_r);
 146                         if (cleanup_fd_w != -1) {
 147                                 flush_write_file(cleanup_fd_w);
 148                                 close(cleanup_fd_w);
 149                         }
 150                         finish_transfer(cleanup_new_fname, fname, NULL, NULL,
 151                                         cleanup_file, 0, !partial_dir);
 152                 }
 153
 154                 /* FALLTHROUGH */
 155 #include "case_N.h"
 156
 157                 io_flush(FULL_FLUSH);
 158
 159                 /* FALLTHROUGH */
 160 #include "case_N.h"
 161
 162                 if (cleanup_fname)
 163                         do_unlink(cleanup_fname);
 164                 if (code)
 165                         kill_all(SIGUSR1);
 166                 if (cleanup_pid && cleanup_pid == getpid()) {
 167                         char *pidf = lp_pid_file();
 168                         if (pidf && *pidf)
 169                                 unlink(lp_pid_file());
 170                 }
 171
 172                 if (code == 0) {
 173                         if (io_error & IOERR_DEL_LIMIT)
 174                                 code = exit_code = RERR_DEL_LIMIT;
 175                         if (io_error & IOERR_VANISHED)
 176                                 code = exit_code = RERR_VANISHED;
 177                         if (io_error & IOERR_GENERAL || log_got_error)
 178                                 code = exit_code = RERR_PARTIAL;
 179                 }
 180
 181                 if (code || am_daemon || (logfile_name && (am_server || !verbose)))
 182                         log_exit(code, file, line);
 183
 184                 /* FALLTHROUGH */
 185 #include "case_N.h"
 186
 187                 if (verbose > 2) {
 188                         rprintf(FINFO,
 189                                 "_exit_cleanup(code=%d, file=%s, line=%d): "
 190                                 "about to call exit(%d)\n",
 191                                 unmodified_code, file, line, code);
 192                 }
 193
 194                 /* FALLTHROUGH */
 195 #include "case_N.h"
 196
 197                 if (am_server && code)
 198                         msleep(100);
 199                 close_all();
 200
 201                 /* FALLTHROUGH */
 202         default:
 203                 break;
 204         }
 205
 206         exit(code);
 207 }
 208
 209 void cleanup_disable(void)
 210 {
 211         cleanup_fname = cleanup_new_fname = NULL;
 212         cleanup_got_literal = 0;
 213 }
 214
 215
 216 void cleanup_set(const char *fnametmp, const char *fname, struct file_struct *file,
 217                  int fd_r, int fd_w)
 218 {
 219         cleanup_fname = fnametmp;
 220         cleanup_new_fname = fname; /* can be NULL on a partial-dir failure */
 221         cleanup_file = file;
 222         cleanup_fd_r = fd_r;
 223         cleanup_fd_w = fd_w;
 224 }
 225
 226 void cleanup_set_pid(pid_t pid)
 227 {
 228         cleanup_pid = pid;
 229 }