| 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 | |
| 27 | int num_waiting(int fd) |
| 28 | { |
| 29 | int len=0; |
| 30 | ioctl(fd,FIONREAD,&len); |
| 31 | return(len); |
| 32 | } |
| 33 | |
| 34 | |
| 35 | struct map_struct *map_file(int fd,off_t len) |
| 36 | { |
| 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 | |
| 49 | #ifdef HAVE_MMAP |
| 50 | if (len < MAX_MAP_SIZE) |
| 51 | ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0); |
| 52 | #endif |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | char *map_ptr(struct map_struct *map,off_t offset,int len) |
| 57 | { |
| 58 | int nread = -2; |
| 59 | |
| 60 | if (map->map) |
| 61 | return map->map+offset; |
| 62 | |
| 63 | if (len == 0) |
| 64 | return NULL; |
| 65 | |
| 66 | len = MIN(len,map->size-offset); |
| 67 | |
| 68 | if (offset >= map->p_offset && |
| 69 | offset+len <= map->p_offset+map->p_len) { |
| 70 | return (map->p + (offset - map->p_offset)); |
| 71 | } |
| 72 | |
| 73 | len = MAX(len,CHUNK_SIZE); |
| 74 | len = MIN(len,map->size - offset); |
| 75 | |
| 76 | if (len > map->p_size) { |
| 77 | if (map->p) free(map->p); |
| 78 | map->p = (char *)malloc(len); |
| 79 | if (!map->p) out_of_memory("map_ptr"); |
| 80 | map->p_size = len; |
| 81 | } |
| 82 | |
| 83 | if (lseek(map->fd,offset,SEEK_SET) != offset || |
| 84 | (nread=read(map->fd,map->p,len)) != len) { |
| 85 | fprintf(FERROR,"EOF in map_ptr! (offset=%d len=%d nread=%d errno=%d)\n", |
| 86 | (int)offset, len, nread, errno); |
| 87 | exit_cleanup(1); |
| 88 | } |
| 89 | |
| 90 | map->p_offset = offset; |
| 91 | map->p_len = len; |
| 92 | |
| 93 | return map->p; |
| 94 | } |
| 95 | |
| 96 | |
| 97 | void unmap_file(struct map_struct *map) |
| 98 | { |
| 99 | #ifdef HAVE_MMAP |
| 100 | if (map->map) |
| 101 | munmap(map->map,map->size); |
| 102 | #endif |
| 103 | if (map->p) free(map->p); |
| 104 | free(map); |
| 105 | } |
| 106 | |
| 107 | |
| 108 | /* this is taken from CVS */ |
| 109 | int piped_child(char **command,int *f_in,int *f_out) |
| 110 | { |
| 111 | int pid; |
| 112 | int to_child_pipe[2]; |
| 113 | int from_child_pipe[2]; |
| 114 | |
| 115 | if (pipe(to_child_pipe) < 0 || |
| 116 | pipe(from_child_pipe) < 0) { |
| 117 | fprintf(FERROR,"pipe: %s\n",strerror(errno)); |
| 118 | exit_cleanup(1); |
| 119 | } |
| 120 | |
| 121 | |
| 122 | pid = do_fork(); |
| 123 | if (pid < 0) { |
| 124 | fprintf(FERROR,"fork: %s\n",strerror(errno)); |
| 125 | exit_cleanup(1); |
| 126 | } |
| 127 | |
| 128 | if (pid == 0) |
| 129 | { |
| 130 | extern int orig_umask; |
| 131 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
| 132 | close(to_child_pipe[1]) < 0 || |
| 133 | close(from_child_pipe[0]) < 0 || |
| 134 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { |
| 135 | fprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
| 136 | exit_cleanup(1); |
| 137 | } |
| 138 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
| 139 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); |
| 140 | umask(orig_umask); |
| 141 | execvp(command[0], command); |
| 142 | fprintf(FERROR,"Failed to exec %s : %s\n", |
| 143 | command[0],strerror(errno)); |
| 144 | exit_cleanup(1); |
| 145 | } |
| 146 | |
| 147 | if (close(from_child_pipe[1]) < 0 || |
| 148 | close(to_child_pipe[0]) < 0) { |
| 149 | fprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
| 150 | exit_cleanup(1); |
| 151 | } |
| 152 | |
| 153 | *f_in = from_child_pipe[0]; |
| 154 | *f_out = to_child_pipe[1]; |
| 155 | |
| 156 | return pid; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | void out_of_memory(char *str) |
| 161 | { |
| 162 | fprintf(FERROR,"out of memory in %s\n",str); |
| 163 | exit_cleanup(1); |
| 164 | } |
| 165 | |
| 166 | |
| 167 | |
| 168 | int set_modtime(char *fname,time_t modtime) |
| 169 | { |
| 170 | #ifdef HAVE_UTIMBUF |
| 171 | struct utimbuf tbuf; |
| 172 | tbuf.actime = time(NULL); |
| 173 | tbuf.modtime = modtime; |
| 174 | return utime(fname,&tbuf); |
| 175 | #elif defined(HAVE_UTIME) |
| 176 | time_t t[2]; |
| 177 | t[0] = time(NULL); |
| 178 | t[1] = modtime; |
| 179 | return utime(fname,t); |
| 180 | #else |
| 181 | struct timeval t[2]; |
| 182 | t[0].tv_sec = time(NULL); |
| 183 | t[0].tv_usec = 0; |
| 184 | t[1].tv_sec = modtime; |
| 185 | t[1].tv_usec = 0; |
| 186 | return utimes(fname,t); |
| 187 | #endif |
| 188 | } |
| 189 | |
| 190 | |
| 191 | |
| 192 | /**************************************************************************** |
| 193 | Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available, |
| 194 | else |
| 195 | if SYSV use O_NDELAY |
| 196 | if BSD use FNDELAY |
| 197 | ****************************************************************************/ |
| 198 | int set_blocking(int fd, int set) |
| 199 | { |
| 200 | int val; |
| 201 | #ifdef O_NONBLOCK |
| 202 | #define FLAG_TO_SET O_NONBLOCK |
| 203 | #else |
| 204 | #ifdef SYSV |
| 205 | #define FLAG_TO_SET O_NDELAY |
| 206 | #else /* BSD */ |
| 207 | #define FLAG_TO_SET FNDELAY |
| 208 | #endif |
| 209 | #endif |
| 210 | |
| 211 | if((val = fcntl(fd, F_GETFL, 0)) == -1) |
| 212 | return -1; |
| 213 | if(set) /* Turn blocking on - ie. clear nonblock flag */ |
| 214 | val &= ~FLAG_TO_SET; |
| 215 | else |
| 216 | val |= FLAG_TO_SET; |
| 217 | return fcntl( fd, F_SETFL, val); |
| 218 | #undef FLAG_TO_SET |
| 219 | } |
| 220 | |
| 221 | /**************************************************************************** |
| 222 | create any necessary directories in fname. Unfortunately we don't know |
| 223 | what perms to give the directory when this is called so we need to rely |
| 224 | on the umask |
| 225 | ****************************************************************************/ |
| 226 | int create_directory_path(char *fname) |
| 227 | { |
| 228 | extern int orig_umask; |
| 229 | char *p; |
| 230 | |
| 231 | while (*fname == '/') fname++; |
| 232 | while (strncmp(fname,"./",2)==0) fname += 2; |
| 233 | |
| 234 | p = fname; |
| 235 | while ((p=strchr(p,'/'))) { |
| 236 | *p = 0; |
| 237 | mkdir(fname,0777 & ~orig_umask); |
| 238 | *p = '/'; |
| 239 | p++; |
| 240 | } |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | |
| 245 | /* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. |
| 246 | Return LEN upon success, write's (negative) error code otherwise. |
| 247 | |
| 248 | derived from GNU C's cccp.c. |
| 249 | */ |
| 250 | int full_write(int desc, char *ptr, int len) |
| 251 | { |
| 252 | int total_written; |
| 253 | |
| 254 | total_written = 0; |
| 255 | while (len > 0) { |
| 256 | int written = write (desc, ptr, len); |
| 257 | if (written < 0) { |
| 258 | #ifdef EINTR |
| 259 | if (errno == EINTR) |
| 260 | continue; |
| 261 | #endif |
| 262 | return written; |
| 263 | } |
| 264 | total_written += written; |
| 265 | ptr += written; |
| 266 | len -= written; |
| 267 | } |
| 268 | return total_written; |
| 269 | } |
| 270 | |
| 271 | /* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted. |
| 272 | Return the actual number of bytes read, zero for EOF, or negative |
| 273 | for an error. |
| 274 | |
| 275 | derived from GNU C's cccp.c. */ |
| 276 | int safe_read(int desc, char *ptr, int len) |
| 277 | { |
| 278 | int n_chars; |
| 279 | |
| 280 | if (len <= 0) |
| 281 | return len; |
| 282 | |
| 283 | #ifdef EINTR |
| 284 | do { |
| 285 | n_chars = read(desc, ptr, len); |
| 286 | } while (n_chars < 0 && errno == EINTR); |
| 287 | #else |
| 288 | n_chars = read(desc, ptr, len); |
| 289 | #endif |
| 290 | |
| 291 | return n_chars; |
| 292 | } |
| 293 | |
| 294 | |
| 295 | /* copy a file - this is used in conjunction with the --temp-dir option */ |
| 296 | int copy_file(char *source, char *dest, mode_t mode) |
| 297 | { |
| 298 | int ifd; |
| 299 | int ofd; |
| 300 | char buf[1024 * 8]; |
| 301 | int len; /* Number of bytes read into `buf'. */ |
| 302 | |
| 303 | ifd = open(source, O_RDONLY); |
| 304 | if (ifd == -1) { |
| 305 | fprintf(FERROR,"open %s: %s\n", |
| 306 | source,strerror(errno)); |
| 307 | return -1; |
| 308 | } |
| 309 | |
| 310 | if (unlink(dest) && errno != ENOENT) { |
| 311 | fprintf(FERROR,"unlink %s: %s\n", |
| 312 | dest,strerror(errno)); |
| 313 | return -1; |
| 314 | } |
| 315 | |
| 316 | ofd = open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode); |
| 317 | if (ofd < 0) { |
| 318 | fprintf(FERROR,"open %s: %s\n", |
| 319 | dest,strerror(errno)); |
| 320 | close(ifd); |
| 321 | return -1; |
| 322 | } |
| 323 | |
| 324 | while ((len = safe_read(ifd, buf, sizeof(buf))) > 0) { |
| 325 | if (full_write(ofd, buf, len) < 0) { |
| 326 | fprintf(FERROR,"write %s: %s\n", |
| 327 | dest,strerror(errno)); |
| 328 | close(ifd); |
| 329 | close(ofd); |
| 330 | return -1; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | close(ifd); |
| 335 | close(ofd); |
| 336 | |
| 337 | if (len < 0) { |
| 338 | fprintf(FERROR,"read %s: %s\n", |
| 339 | source,strerror(errno)); |
| 340 | return -1; |
| 341 | } |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | /* sleep for a while via select */ |
| 347 | void u_sleep(int usec) |
| 348 | { |
| 349 | struct timeval tv; |
| 350 | |
| 351 | tv.tv_sec = 0; |
| 352 | tv.tv_usec = usec; |
| 353 | select(0, NULL, NULL, NULL, &tv); |
| 354 | } |
| 355 | |
| 356 | |
| 357 | static pid_t all_pids[10]; |
| 358 | static int num_pids; |
| 359 | |
| 360 | /* fork and record the pid of the child */ |
| 361 | pid_t do_fork(void) |
| 362 | { |
| 363 | pid_t newpid = fork(); |
| 364 | |
| 365 | if (newpid) { |
| 366 | all_pids[num_pids++] = newpid; |
| 367 | } |
| 368 | return newpid; |
| 369 | } |
| 370 | |
| 371 | /* kill all children */ |
| 372 | void kill_all(int sig) |
| 373 | { |
| 374 | int i; |
| 375 | for (i=0;i<num_pids;i++) { |
| 376 | if (all_pids[i] != getpid()) |
| 377 | kill(all_pids[i], sig); |
| 378 | } |
| 379 | } |