Fix the val reading for MSG_ERROR_EXIT. Use 0-length MSG_DATA when
[rsync/rsync.git] / 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) 2003-2009 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_sender;
28 extern int am_generator;
29 extern int io_error;
30 extern int keep_partial;
31 extern int got_xfer_error;
32 extern int protocol_version;
33 extern int output_needs_newline;
34 extern char *partial_dir;
35 extern char *logfile_name;
36
37 BOOL shutting_down = 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 cleanup_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 (cleanup_step) {
124 #include "case_N.h" /* case 0: cleanup_step++; */
125
126                 exit_code = unmodified_code = code;
127                 exit_file = file;
128                 exit_line = line;
129
130                 if (output_needs_newline) {
131                         fputc('\n', stdout);
132                         output_needs_newline = 0;
133                 }
134
135                 if (DEBUG_GTE(EXIT, 2)) {
136                         rprintf(FINFO,
137                                 "[%s] _exit_cleanup(code=%d, file=%s, line=%d): entered\n",
138                                 who_am_i(), code, file, line);
139                 }
140
141                 /* FALLTHROUGH */
142 #include "case_N.h"
143
144                 if (cleanup_child_pid != -1) {
145                         int status;
146                         int pid = wait_process(cleanup_child_pid, &status, WNOHANG);
147                         if (pid == cleanup_child_pid) {
148                                 status = WEXITSTATUS(status);
149                                 if (status > code)
150                                         code = exit_code = status;
151                         }
152                 }
153
154                 /* FALLTHROUGH */
155 #include "case_N.h"
156
157                 if (cleanup_got_literal && cleanup_fname && cleanup_new_fname
158                  && keep_partial && handle_partial_dir(cleanup_new_fname, PDIR_CREATE)) {
159                         const char *fname = cleanup_fname;
160                         cleanup_fname = NULL;
161                         if (cleanup_fd_r != -1)
162                                 close(cleanup_fd_r);
163                         if (cleanup_fd_w != -1) {
164                                 flush_write_file(cleanup_fd_w);
165                                 close(cleanup_fd_w);
166                         }
167                         finish_transfer(cleanup_new_fname, fname, NULL, NULL,
168                                         cleanup_file, 0, !partial_dir);
169                 }
170
171                 /* FALLTHROUGH */
172 #include "case_N.h"
173
174                 if (!code || am_server || (!am_sender && !am_generator))
175                         io_flush(FULL_FLUSH);
176
177                 /* FALLTHROUGH */
178 #include "case_N.h"
179
180                 if (cleanup_fname)
181                         do_unlink(cleanup_fname);
182                 if (code)
183                         kill_all(SIGUSR1);
184                 if (cleanup_pid && cleanup_pid == getpid()) {
185                         char *pidf = lp_pid_file();
186                         if (pidf && *pidf)
187                                 unlink(lp_pid_file());
188                 }
189
190                 if (code == 0) {
191                         if (io_error & IOERR_DEL_LIMIT)
192                                 code = exit_code = RERR_DEL_LIMIT;
193                         if (io_error & IOERR_VANISHED)
194                                 code = exit_code = RERR_VANISHED;
195                         if (io_error & IOERR_GENERAL || got_xfer_error)
196                                 code = exit_code = RERR_PARTIAL;
197                 }
198
199                 /* If line < 0, this exit is after a MSG_ERROR_EXIT event, so
200                  * we don't want to output a duplicate error. */
201                 if ((code && line > 0)
202                  || am_daemon || (logfile_name && (am_server || !INFO_GTE(STATS, 1))))
203                         log_exit(code, file, line);
204
205                 /* FALLTHROUGH */
206 #include "case_N.h"
207
208                 if (DEBUG_GTE(EXIT, 1)) {
209                         rprintf(FINFO,
210                                 "[%s] _exit_cleanup(code=%d, file=%s, line=%d): "
211                                 "about to call exit(%d)\n",
212                                 who_am_i(), unmodified_code, file, line, code);
213                 }
214
215                 /* FALLTHROUGH */
216 #include "case_N.h"
217
218                 if (exit_code && exit_code != RERR_SOCKETIO && exit_code != RERR_STREAMIO && exit_code != RERR_SIGNAL1
219                  && !shutting_down && (protocol_version >= 31 || (!am_sender && !am_generator))) {
220                         if (line > 0) {
221                                 if (DEBUG_GTE(EXIT, 3)) {
222                                         rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT with exit_code %d\n",
223                                                 who_am_i(), exit_code);
224                                 }
225                                 send_msg_int(MSG_ERROR_EXIT, exit_code);
226                         }
227                         noop_io_until_death();
228                 }
229
230                 /* FALLTHROUGH */
231 #include "case_N.h"
232
233                 if (am_server && code)
234                         msleep(100);
235                 close_all();
236
237                 /* FALLTHROUGH */
238         default:
239                 break;
240         }
241
242         exit(code);
243 }
244
245 void cleanup_disable(void)
246 {
247         cleanup_fname = cleanup_new_fname = NULL;
248         cleanup_got_literal = 0;
249 }
250
251
252 void cleanup_set(const char *fnametmp, const char *fname, struct file_struct *file,
253                  int fd_r, int fd_w)
254 {
255         cleanup_fname = fnametmp;
256         cleanup_new_fname = fname; /* can be NULL on a partial-dir failure */
257         cleanup_file = file;
258         cleanup_fd_r = fd_r;
259         cleanup_fd_w = fd_w;
260 }
261
262 void cleanup_set_pid(pid_t pid)
263 {
264         cleanup_pid = pid;
265 }