Commit | Line | Data |
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c627d613 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | /* | |
21 | Utilities used in rsync | |
22 | ||
23 | tridge, June 1996 | |
24 | */ | |
25 | #include "rsync.h" | |
26 | ||
720b47f2 | 27 | int num_waiting(int fd) |
94481d91 AT |
28 | { |
29 | int len=0; | |
94481d91 | 30 | ioctl(fd,FIONREAD,&len); |
94481d91 AT |
31 | return(len); |
32 | } | |
33 | ||
d9bea2dd | 34 | |
c6e7fcb4 | 35 | struct map_struct *map_file(int fd,off_t len) |
c627d613 | 36 | { |
c6e7fcb4 AT |
37 | struct map_struct *ret; |
38 | ret = (struct map_struct *)malloc(sizeof(*ret)); | |
39 | if (!ret) out_of_memory("map_file"); | |
40 | ||
41 | ret->map = NULL; | |
42 | ret->fd = fd; | |
43 | ret->size = len; | |
44 | ret->p = NULL; | |
45 | ret->p_size = 0; | |
46 | ret->p_offset = 0; | |
47 | ret->p_len = 0; | |
48 | ||
d9bea2dd AT |
49 | #ifdef HAVE_MMAP |
50 | if (len < MAX_MAP_SIZE) | |
c6e7fcb4 | 51 | ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0); |
d9bea2dd | 52 | #endif |
c627d613 AT |
53 | return ret; |
54 | } | |
55 | ||
0b910560 | 56 | |
c6e7fcb4 | 57 | char *map_ptr(struct map_struct *map,off_t offset,int len) |
d9bea2dd | 58 | { |
0cfcfa29 AT |
59 | int nread = -2; |
60 | ||
c6e7fcb4 AT |
61 | if (map->map) |
62 | return map->map+offset; | |
d9bea2dd AT |
63 | |
64 | if (len == 0) | |
65 | return NULL; | |
66 | ||
0b910560 AT |
67 | if (len > (map->size-offset)) |
68 | len = map->size-offset; | |
d9bea2dd | 69 | |
c6e7fcb4 AT |
70 | if (offset >= map->p_offset && |
71 | offset+len <= map->p_offset+map->p_len) { | |
72 | return (map->p + (offset - map->p_offset)); | |
d9bea2dd AT |
73 | } |
74 | ||
34ccb63e | 75 | len = MAX(len,CHUNK_SIZE); |
0b910560 AT |
76 | if (len > (map->size-offset)) |
77 | len = map->size-offset; | |
d9bea2dd | 78 | |
c6e7fcb4 AT |
79 | if (len > map->p_size) { |
80 | if (map->p) free(map->p); | |
81 | map->p = (char *)malloc(len); | |
82 | if (!map->p) out_of_memory("map_ptr"); | |
83 | map->p_size = len; | |
d9bea2dd AT |
84 | } |
85 | ||
c6e7fcb4 | 86 | if (lseek(map->fd,offset,SEEK_SET) != offset || |
0cfcfa29 | 87 | (nread=read(map->fd,map->p,len)) != len) { |
feaa89c4 AT |
88 | fprintf(FERROR,"EOF in map_ptr! (offset=%d len=%d nread=%d errno=%d)\n", |
89 | (int)offset, len, nread, errno); | |
90 | exit_cleanup(1); | |
d9bea2dd AT |
91 | } |
92 | ||
c6e7fcb4 AT |
93 | map->p_offset = offset; |
94 | map->p_len = len; | |
d9bea2dd | 95 | |
c6e7fcb4 | 96 | return map->p; |
d9bea2dd AT |
97 | } |
98 | ||
99 | ||
c6e7fcb4 | 100 | void unmap_file(struct map_struct *map) |
c627d613 | 101 | { |
7bec6a5c | 102 | #ifdef HAVE_MMAP |
c6e7fcb4 AT |
103 | if (map->map) |
104 | munmap(map->map,map->size); | |
7bec6a5c | 105 | #endif |
c6e7fcb4 AT |
106 | if (map->p) free(map->p); |
107 | free(map); | |
c627d613 AT |
108 | } |
109 | ||
110 | ||
c627d613 AT |
111 | /* this is taken from CVS */ |
112 | int piped_child(char **command,int *f_in,int *f_out) | |
113 | { | |
114 | int pid; | |
115 | int to_child_pipe[2]; | |
116 | int from_child_pipe[2]; | |
117 | ||
118 | if (pipe(to_child_pipe) < 0 || | |
119 | pipe(from_child_pipe) < 0) { | |
dc5ddbcc | 120 | fprintf(FERROR,"pipe: %s\n",strerror(errno)); |
34ccb63e | 121 | exit_cleanup(1); |
c627d613 AT |
122 | } |
123 | ||
124 | ||
3ba62a83 | 125 | pid = do_fork(); |
c627d613 | 126 | if (pid < 0) { |
dc5ddbcc | 127 | fprintf(FERROR,"fork: %s\n",strerror(errno)); |
34ccb63e | 128 | exit_cleanup(1); |
c627d613 AT |
129 | } |
130 | ||
131 | if (pid == 0) | |
132 | { | |
6574b4f7 | 133 | extern int orig_umask; |
c627d613 AT |
134 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
135 | close(to_child_pipe[1]) < 0 || | |
136 | close(from_child_pipe[0]) < 0 || | |
137 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
dc5ddbcc | 138 | fprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
34ccb63e | 139 | exit_cleanup(1); |
c627d613 | 140 | } |
773f2bd4 AT |
141 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
142 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); | |
6574b4f7 | 143 | umask(orig_umask); |
c627d613 | 144 | execvp(command[0], command); |
dc5ddbcc | 145 | fprintf(FERROR,"Failed to exec %s : %s\n", |
c627d613 | 146 | command[0],strerror(errno)); |
34ccb63e | 147 | exit_cleanup(1); |
c627d613 AT |
148 | } |
149 | ||
150 | if (close(from_child_pipe[1]) < 0 || | |
151 | close(to_child_pipe[0]) < 0) { | |
dc5ddbcc | 152 | fprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
34ccb63e | 153 | exit_cleanup(1); |
c627d613 AT |
154 | } |
155 | ||
156 | *f_in = from_child_pipe[0]; | |
157 | *f_out = to_child_pipe[1]; | |
158 | ||
159 | return pid; | |
160 | } | |
161 | ||
162 | ||
163 | void out_of_memory(char *str) | |
164 | { | |
dc5ddbcc | 165 | fprintf(FERROR,"out of memory in %s\n",str); |
34ccb63e | 166 | exit_cleanup(1); |
c627d613 AT |
167 | } |
168 | ||
169 | ||
c627d613 AT |
170 | |
171 | int set_modtime(char *fname,time_t modtime) | |
172 | { | |
1e9f155a | 173 | #ifdef HAVE_UTIMBUF |
c627d613 AT |
174 | struct utimbuf tbuf; |
175 | tbuf.actime = time(NULL); | |
176 | tbuf.modtime = modtime; | |
177 | return utime(fname,&tbuf); | |
178 | #elif defined(HAVE_UTIME) | |
179 | time_t t[2]; | |
180 | t[0] = time(NULL); | |
181 | t[1] = modtime; | |
182 | return utime(fname,t); | |
183 | #else | |
184 | struct timeval t[2]; | |
185 | t[0].tv_sec = time(NULL); | |
186 | t[0].tv_usec = 0; | |
187 | t[1].tv_sec = modtime; | |
188 | t[1].tv_usec = 0; | |
189 | return utimes(fname,t); | |
190 | #endif | |
191 | } | |
94481d91 | 192 | |
720b47f2 AT |
193 | |
194 | ||
195 | /**************************************************************************** | |
196 | Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available, | |
197 | else | |
198 | if SYSV use O_NDELAY | |
199 | if BSD use FNDELAY | |
200 | ****************************************************************************/ | |
201 | int set_blocking(int fd, int set) | |
202 | { | |
203 | int val; | |
204 | #ifdef O_NONBLOCK | |
205 | #define FLAG_TO_SET O_NONBLOCK | |
206 | #else | |
207 | #ifdef SYSV | |
208 | #define FLAG_TO_SET O_NDELAY | |
209 | #else /* BSD */ | |
210 | #define FLAG_TO_SET FNDELAY | |
211 | #endif | |
212 | #endif | |
213 | ||
214 | if((val = fcntl(fd, F_GETFL, 0)) == -1) | |
215 | return -1; | |
216 | if(set) /* Turn blocking on - ie. clear nonblock flag */ | |
217 | val &= ~FLAG_TO_SET; | |
218 | else | |
219 | val |= FLAG_TO_SET; | |
220 | return fcntl( fd, F_SETFL, val); | |
221 | #undef FLAG_TO_SET | |
222 | } | |
6574b4f7 AT |
223 | |
224 | /**************************************************************************** | |
225 | create any necessary directories in fname. Unfortunately we don't know | |
226 | what perms to give the directory when this is called so we need to rely | |
227 | on the umask | |
228 | ****************************************************************************/ | |
229 | int create_directory_path(char *fname) | |
230 | { | |
231 | extern int orig_umask; | |
232 | char *p; | |
233 | ||
234 | while (*fname == '/') fname++; | |
235 | while (strncmp(fname,"./",2)==0) fname += 2; | |
236 | ||
237 | p = fname; | |
238 | while ((p=strchr(p,'/'))) { | |
239 | *p = 0; | |
240 | mkdir(fname,0777 & ~orig_umask); | |
241 | *p = '/'; | |
242 | p++; | |
243 | } | |
244 | return 0; | |
245 | } | |
950ab32d AT |
246 | |
247 | ||
248 | /* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. | |
249 | Return LEN upon success, write's (negative) error code otherwise. | |
250 | ||
251 | derived from GNU C's cccp.c. | |
252 | */ | |
253 | int full_write(int desc, char *ptr, int len) | |
254 | { | |
255 | int total_written; | |
256 | ||
257 | total_written = 0; | |
258 | while (len > 0) { | |
259 | int written = write (desc, ptr, len); | |
260 | if (written < 0) { | |
261 | #ifdef EINTR | |
262 | if (errno == EINTR) | |
263 | continue; | |
264 | #endif | |
265 | return written; | |
266 | } | |
267 | total_written += written; | |
268 | ptr += written; | |
269 | len -= written; | |
270 | } | |
271 | return total_written; | |
272 | } | |
273 | ||
274 | /* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted. | |
275 | Return the actual number of bytes read, zero for EOF, or negative | |
276 | for an error. | |
277 | ||
278 | derived from GNU C's cccp.c. */ | |
279 | int safe_read(int desc, char *ptr, int len) | |
280 | { | |
281 | int n_chars; | |
282 | ||
283 | if (len <= 0) | |
284 | return len; | |
285 | ||
286 | #ifdef EINTR | |
287 | do { | |
288 | n_chars = read(desc, ptr, len); | |
289 | } while (n_chars < 0 && errno == EINTR); | |
290 | #else | |
291 | n_chars = read(desc, ptr, len); | |
292 | #endif | |
293 | ||
294 | return n_chars; | |
295 | } | |
296 | ||
297 | ||
298 | /* copy a file - this is used in conjunction with the --temp-dir option */ | |
299 | int copy_file(char *source, char *dest, mode_t mode) | |
300 | { | |
301 | int ifd; | |
302 | int ofd; | |
303 | char buf[1024 * 8]; | |
304 | int len; /* Number of bytes read into `buf'. */ | |
305 | ||
306 | ifd = open(source, O_RDONLY); | |
307 | if (ifd == -1) { | |
308 | fprintf(FERROR,"open %s: %s\n", | |
309 | source,strerror(errno)); | |
310 | return -1; | |
311 | } | |
312 | ||
313 | if (unlink(dest) && errno != ENOENT) { | |
314 | fprintf(FERROR,"unlink %s: %s\n", | |
315 | dest,strerror(errno)); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | ofd = open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode); | |
320 | if (ofd < 0) { | |
321 | fprintf(FERROR,"open %s: %s\n", | |
322 | dest,strerror(errno)); | |
323 | close(ifd); | |
324 | return -1; | |
325 | } | |
326 | ||
327 | while ((len = safe_read(ifd, buf, sizeof(buf))) > 0) { | |
328 | if (full_write(ofd, buf, len) < 0) { | |
329 | fprintf(FERROR,"write %s: %s\n", | |
330 | dest,strerror(errno)); | |
331 | close(ifd); | |
332 | close(ofd); | |
333 | return -1; | |
334 | } | |
335 | } | |
336 | ||
337 | close(ifd); | |
338 | close(ofd); | |
339 | ||
340 | if (len < 0) { | |
341 | fprintf(FERROR,"read %s: %s\n", | |
342 | source,strerror(errno)); | |
343 | return -1; | |
344 | } | |
345 | ||
346 | return 0; | |
347 | } | |
feaa89c4 AT |
348 | |
349 | /* sleep for a while via select */ | |
350 | void u_sleep(int usec) | |
351 | { | |
352 | struct timeval tv; | |
353 | ||
354 | tv.tv_sec = 0; | |
355 | tv.tv_usec = usec; | |
356 | select(0, NULL, NULL, NULL, &tv); | |
357 | } | |
3ba62a83 AT |
358 | |
359 | ||
360 | static pid_t all_pids[10]; | |
361 | static int num_pids; | |
362 | ||
363 | /* fork and record the pid of the child */ | |
364 | pid_t do_fork(void) | |
365 | { | |
366 | pid_t newpid = fork(); | |
367 | ||
368 | if (newpid) { | |
369 | all_pids[num_pids++] = newpid; | |
370 | } | |
371 | return newpid; | |
372 | } | |
373 | ||
374 | /* kill all children */ | |
375 | void kill_all(int sig) | |
376 | { | |
377 | int i; | |
378 | for (i=0;i<num_pids;i++) { | |
379 | if (all_pids[i] != getpid()) | |
380 | kill(all_pids[i], sig); | |
381 | } | |
382 | } |