| File: | src/usr.bin/xargs/xargs.c |
| Warning: | line 530, column 10 Although the value stored to 'pid' is used in the enclosing expression, the value is never actually read from 'pid' |
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| 1 | /* $OpenBSD: xargs.c,v 1.35 2020/07/19 13:19:25 schwarze Exp $ */ |
| 2 | /* $FreeBSD: xargs.c,v 1.51 2003/05/03 19:09:11 obrien Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c) 1990, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * This code is derived from software contributed to Berkeley by |
| 9 | * John B. Roll Jr. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * 3. Neither the name of the University nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | * |
| 35 | * $xMach: xargs.c,v 1.6 2002/02/23 05:27:47 tim Exp $ |
| 36 | */ |
| 37 | |
| 38 | #include <sys/wait.h> |
| 39 | |
| 40 | #include <ctype.h> |
| 41 | #include <err.h> |
| 42 | #include <errno(*__errno()).h> |
| 43 | #include <fcntl.h> |
| 44 | #include <paths.h> |
| 45 | #include <signal.h> |
| 46 | #include <stdio.h> |
| 47 | #include <stdlib.h> |
| 48 | #include <string.h> |
| 49 | #include <unistd.h> |
| 50 | #include <limits.h> |
| 51 | |
| 52 | #include "pathnames.h" |
| 53 | |
| 54 | static void parse_input(int, char *[]); |
| 55 | static void prerun(int, char *[]); |
| 56 | static int prompt(void); |
| 57 | static void run(char **); |
| 58 | static void usage(void); |
| 59 | void strnsubst(char **, const char *, const char *, size_t); |
| 60 | static void waitchildren(const char *, int); |
| 61 | |
| 62 | static char **av, **bxp, **ep, **endxp, **xp; |
| 63 | static char *argp, *bbp, *ebp, *inpline, *p, *replstr; |
| 64 | static const char *eofstr; |
| 65 | static int count, insingle, indouble, oflag, pflag, tflag, Rflag, rval, zflag; |
| 66 | static int cnt, Iflag, jfound, Lflag, wasquoted, xflag, runeof = 1; |
| 67 | static int curprocs, maxprocs; |
| 68 | static size_t inpsize; |
| 69 | |
| 70 | extern char **environ; |
| 71 | |
| 72 | int |
| 73 | main(int argc, char *argv[]) |
| 74 | { |
| 75 | long arg_max; |
| 76 | int ch, Jflag, nargs, nflag, nline; |
| 77 | size_t linelen; |
| 78 | char *endptr; |
| 79 | const char *errstr; |
| 80 | |
| 81 | inpline = replstr = NULL((void *)0); |
| 82 | ep = environ; |
| 83 | eofstr = ""; |
| 84 | Jflag = nflag = 0; |
| 85 | |
| 86 | /* |
| 87 | * POSIX.2 limits the exec line length to ARG_MAX - 2K. Running that |
| 88 | * caused some E2BIG errors, so it was changed to ARG_MAX - 4K. Given |
| 89 | * that the smallest argument is 2 bytes in length, this means that |
| 90 | * the number of arguments is limited to: |
| 91 | * |
| 92 | * (ARG_MAX - 4K - LENGTH(utility + arguments)) / 2. |
| 93 | * |
| 94 | * We arbitrarily limit the number of arguments to 5000. This is |
| 95 | * allowed by POSIX.2 as long as the resulting minimum exec line is |
| 96 | * at least LINE_MAX. Realloc'ing as necessary is possible, but |
| 97 | * probably not worthwhile. |
| 98 | */ |
| 99 | nargs = 5000; |
| 100 | if ((arg_max = sysconf(_SC_ARG_MAX1)) == -1) |
| 101 | errx(1, "sysconf(_SC_ARG_MAX) failed"); |
| 102 | |
| 103 | if (pledge("stdio rpath proc exec", NULL((void *)0)) == -1) |
| 104 | err(1, "pledge"); |
| 105 | |
| 106 | nline = arg_max - 4 * 1024; |
| 107 | while (*ep != NULL((void *)0)) { |
| 108 | /* 1 byte for each '\0' */ |
| 109 | nline -= strlen(*ep++) + 1 + sizeof(*ep); |
| 110 | } |
| 111 | maxprocs = 1; |
| 112 | while ((ch = getopt(argc, argv, "0E:I:J:L:n:oP:pR:rs:tx")) != -1) |
| 113 | switch (ch) { |
| 114 | case 'E': |
| 115 | eofstr = optarg; |
| 116 | break; |
| 117 | case 'I': |
| 118 | Jflag = 0; |
| 119 | Iflag = 1; |
| 120 | Lflag = 1; |
| 121 | replstr = optarg; |
| 122 | break; |
| 123 | case 'J': |
| 124 | Iflag = 0; |
| 125 | Jflag = 1; |
| 126 | replstr = optarg; |
| 127 | break; |
| 128 | case 'L': |
| 129 | Lflag = strtonum(optarg, 0, INT_MAX2147483647, &errstr); |
| 130 | if (errstr) |
| 131 | errx(1, "-L %s: %s", optarg, errstr); |
| 132 | break; |
| 133 | case 'n': |
| 134 | nflag = 1; |
| 135 | nargs = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
| 136 | if (errstr) |
| 137 | errx(1, "-n %s: %s", optarg, errstr); |
| 138 | break; |
| 139 | case 'o': |
| 140 | oflag = 1; |
| 141 | break; |
| 142 | case 'P': |
| 143 | maxprocs = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
| 144 | if (errstr) |
| 145 | errx(1, "-P %s: %s", optarg, errstr); |
| 146 | break; |
| 147 | case 'p': |
| 148 | pflag = 1; |
| 149 | break; |
| 150 | case 'r': |
| 151 | runeof = 0; |
| 152 | break; |
| 153 | case 'R': |
| 154 | Rflag = strtol(optarg, &endptr, 10); |
| 155 | if (*endptr != '\0') |
| 156 | errx(1, "replacements must be a number"); |
| 157 | break; |
| 158 | case 's': |
| 159 | nline = strtonum(optarg, 0, INT_MAX2147483647, &errstr); |
| 160 | if (errstr) |
| 161 | errx(1, "-s %s: %s", optarg, errstr); |
| 162 | break; |
| 163 | case 't': |
| 164 | tflag = 1; |
| 165 | break; |
| 166 | case 'x': |
| 167 | xflag = 1; |
| 168 | break; |
| 169 | case '0': |
| 170 | zflag = 1; |
| 171 | break; |
| 172 | case '?': |
| 173 | default: |
| 174 | usage(); |
| 175 | } |
| 176 | argc -= optind; |
| 177 | argv += optind; |
| 178 | |
| 179 | if (!Iflag && Rflag) |
| 180 | usage(); |
| 181 | if (Iflag && !Rflag) |
| 182 | Rflag = 5; |
| 183 | if (xflag && !nflag) |
| 184 | usage(); |
| 185 | if (Iflag || Lflag) |
| 186 | xflag = 1; |
| 187 | if (replstr != NULL((void *)0) && *replstr == '\0') |
| 188 | errx(1, "replstr may not be empty"); |
| 189 | |
| 190 | /* |
| 191 | * Allocate pointers for the utility name, the utility arguments, |
| 192 | * the maximum arguments to be read from stdin and the trailing |
| 193 | * NULL. |
| 194 | */ |
| 195 | linelen = 1 + argc + nargs + 1; |
| 196 | if ((av = bxp = calloc(linelen, sizeof(char *))) == NULL((void *)0)) |
| 197 | err(1, NULL((void *)0)); |
| 198 | |
| 199 | /* |
| 200 | * Use the user's name for the utility as argv[0], just like the |
| 201 | * shell. Echo is the default. Set up pointers for the user's |
| 202 | * arguments. |
| 203 | */ |
| 204 | if (*argv == NULL((void *)0)) |
| 205 | cnt = strlen(*bxp++ = _PATH_ECHO"/bin/echo"); |
| 206 | else { |
| 207 | do { |
| 208 | if (Jflag && strcmp(*argv, replstr) == 0) { |
| 209 | char **avj; |
| 210 | jfound = 1; |
| 211 | argv++; |
| 212 | for (avj = argv; *avj; avj++) |
| 213 | cnt += strlen(*avj) + 1; |
| 214 | break; |
| 215 | } |
| 216 | cnt += strlen(*bxp++ = *argv) + 1; |
| 217 | } while (*++argv != NULL((void *)0)); |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Set up begin/end/traversing pointers into the array. The -n |
| 222 | * count doesn't include the trailing NULL pointer, so the malloc |
| 223 | * added in an extra slot. |
| 224 | */ |
| 225 | endxp = (xp = bxp) + nargs; |
| 226 | |
| 227 | /* |
| 228 | * Allocate buffer space for the arguments read from stdin and the |
| 229 | * trailing NULL. Buffer space is defined as the default or specified |
| 230 | * space, minus the length of the utility name and arguments. Set up |
| 231 | * begin/end/traversing pointers into the array. The -s count does |
| 232 | * include the trailing NULL, so the malloc didn't add in an extra |
| 233 | * slot. |
| 234 | */ |
| 235 | nline -= cnt; |
| 236 | if (nline <= 0) |
| 237 | errx(1, "insufficient space for command"); |
| 238 | |
| 239 | if ((bbp = malloc((size_t)(nline + 1))) == NULL((void *)0)) |
| 240 | err(1, NULL((void *)0)); |
| 241 | ebp = (argp = p = bbp) + nline - 1; |
| 242 | for (;;) |
| 243 | parse_input(argc, argv); |
| 244 | } |
| 245 | |
| 246 | static void |
| 247 | parse_input(int argc, char *argv[]) |
| 248 | { |
| 249 | int hasblank = 0; |
| 250 | static int hadblank = 0; |
| 251 | int ch, foundeof = 0; |
| 252 | char **avj; |
| 253 | |
| 254 | ch = getchar()(!__isthreaded ? (--((&__sF[0]))->_r < 0 ? __srget( (&__sF[0])) : (int)(*((&__sF[0]))->_p++)) : (getc) ((&__sF[0]))); |
| 255 | if (isblank(ch)) { |
| 256 | /* Quotes escape tabs and spaces. */ |
| 257 | if (insingle || indouble) |
| 258 | goto addch; |
| 259 | hasblank = 1; |
| 260 | if (zflag) |
| 261 | goto addch; |
| 262 | goto arg2; |
| 263 | } |
| 264 | |
| 265 | switch (ch) { |
| 266 | case EOF(-1): |
| 267 | /* No arguments since last exec. */ |
| 268 | if (p == bbp) { |
| 269 | if (runeof) |
| 270 | prerun(0, av); |
| 271 | waitchildren(*argv, 1); |
| 272 | exit(rval); |
| 273 | } |
| 274 | goto arg1; |
| 275 | case '\0': |
| 276 | if (zflag) { |
| 277 | /* |
| 278 | * Increment 'count', so that nulls will be treated |
| 279 | * as end-of-line, as well as end-of-argument. This |
| 280 | * is needed so -0 works properly with -I and -L. |
| 281 | */ |
| 282 | count++; |
| 283 | goto arg2; |
| 284 | } |
| 285 | goto addch; |
| 286 | case '\n': |
| 287 | if (zflag) |
| 288 | goto addch; |
| 289 | hasblank = 1; |
| 290 | if (hadblank == 0) |
| 291 | count++; |
| 292 | |
| 293 | /* Quotes do not escape newlines. */ |
| 294 | arg1: if (insingle || indouble) |
| 295 | errx(1, "unterminated quote"); |
| 296 | arg2: |
| 297 | foundeof = *eofstr != '\0' && |
| 298 | strcmp(argp, eofstr) == 0; |
| 299 | |
| 300 | /* Do not make empty args unless they are quoted */ |
| 301 | if ((argp != p || wasquoted) && !foundeof) { |
| 302 | *p++ = '\0'; |
| 303 | *xp++ = argp; |
| 304 | if (Iflag) { |
| 305 | size_t curlen; |
| 306 | |
| 307 | if (inpline == NULL((void *)0)) |
| 308 | curlen = 0; |
| 309 | else { |
| 310 | /* |
| 311 | * If this string is not zero |
| 312 | * length, append a space for |
| 313 | * separation before the next |
| 314 | * argument. |
| 315 | */ |
| 316 | if ((curlen = strlen(inpline))) |
| 317 | strlcat(inpline, " ", inpsize); |
| 318 | } |
| 319 | curlen++; |
| 320 | /* |
| 321 | * Allocate enough to hold what we will |
| 322 | * be holding in a second, and to append |
| 323 | * a space next time through, if we have |
| 324 | * to. |
| 325 | */ |
| 326 | inpsize = curlen + 2 + strlen(argp); |
| 327 | inpline = realloc(inpline, inpsize); |
| 328 | if (inpline == NULL((void *)0)) |
| 329 | errx(1, "realloc failed"); |
| 330 | if (curlen == 1) |
| 331 | strlcpy(inpline, argp, inpsize); |
| 332 | else |
| 333 | strlcat(inpline, argp, inpsize); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * If max'd out on args or buffer, or reached EOF, |
| 339 | * run the command. If xflag and max'd out on buffer |
| 340 | * but not on args, object. Having reached the limit |
| 341 | * of input lines, as specified by -L is the same as |
| 342 | * maxing out on arguments. |
| 343 | */ |
| 344 | if (xp == endxp || p > ebp || ch == EOF(-1) || |
| 345 | (Lflag <= count && xflag) || foundeof) { |
| 346 | if (xflag && xp != endxp && p > ebp) |
| 347 | errx(1, "insufficient space for arguments"); |
| 348 | if (jfound) { |
| 349 | for (avj = argv; *avj; avj++) |
| 350 | *xp++ = *avj; |
| 351 | } |
| 352 | prerun(argc, av); |
| 353 | if (ch == EOF(-1) || foundeof) { |
| 354 | waitchildren(*argv, 1); |
| 355 | exit(rval); |
| 356 | } |
| 357 | p = bbp; |
| 358 | xp = bxp; |
| 359 | count = 0; |
| 360 | } |
| 361 | argp = p; |
| 362 | wasquoted = 0; |
| 363 | break; |
| 364 | case '\'': |
| 365 | if (indouble || zflag) |
| 366 | goto addch; |
| 367 | insingle = !insingle; |
| 368 | wasquoted = 1; |
| 369 | break; |
| 370 | case '"': |
| 371 | if (insingle || zflag) |
| 372 | goto addch; |
| 373 | indouble = !indouble; |
| 374 | wasquoted = 1; |
| 375 | break; |
| 376 | case '\\': |
| 377 | if (zflag) |
| 378 | goto addch; |
| 379 | /* Backslash escapes anything, is escaped by quotes. */ |
| 380 | if (!insingle && !indouble && (ch = getchar()(!__isthreaded ? (--((&__sF[0]))->_r < 0 ? __srget( (&__sF[0])) : (int)(*((&__sF[0]))->_p++)) : (getc) ((&__sF[0])))) == EOF(-1)) |
| 381 | errx(1, "backslash at EOF"); |
| 382 | /* FALLTHROUGH */ |
| 383 | default: |
| 384 | addch: if (p < ebp) { |
| 385 | *p++ = ch; |
| 386 | break; |
| 387 | } |
| 388 | |
| 389 | /* If only one argument, not enough buffer space. */ |
| 390 | if (bxp == xp) |
| 391 | errx(1, "insufficient space for argument"); |
| 392 | /* Didn't hit argument limit, so if xflag object. */ |
| 393 | if (xflag) |
| 394 | errx(1, "insufficient space for arguments"); |
| 395 | |
| 396 | if (jfound) { |
| 397 | for (avj = argv; *avj; avj++) |
| 398 | *xp++ = *avj; |
| 399 | } |
| 400 | prerun(argc, av); |
| 401 | xp = bxp; |
| 402 | cnt = ebp - argp; |
| 403 | memmove(bbp, argp, (size_t)cnt); |
| 404 | p = (argp = bbp) + cnt; |
| 405 | *p++ = ch; |
| 406 | break; |
| 407 | } |
| 408 | hadblank = hasblank; |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * Do things necessary before run()'ing, such as -I substitution, |
| 413 | * and then call run(). |
| 414 | */ |
| 415 | static void |
| 416 | prerun(int argc, char *argv[]) |
| 417 | { |
| 418 | char **tmp, **tmp2, **avj; |
| 419 | int repls; |
| 420 | |
| 421 | repls = Rflag; |
| 422 | runeof = 0; |
| 423 | |
| 424 | if (argc == 0 || repls == 0) { |
| 425 | *xp = NULL((void *)0); |
| 426 | run(argv); |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | avj = argv; |
| 431 | |
| 432 | /* |
| 433 | * Allocate memory to hold the argument list, and |
| 434 | * a NULL at the tail. |
| 435 | */ |
| 436 | tmp = calloc(argc + 1, sizeof(char *)); |
| 437 | if (tmp == NULL((void *)0)) |
| 438 | err(1, NULL((void *)0)); |
| 439 | tmp2 = tmp; |
| 440 | |
| 441 | /* |
| 442 | * Save the first argument and iterate over it, we |
| 443 | * cannot do strnsubst() to it. |
| 444 | */ |
| 445 | if ((*tmp++ = strdup(*avj++)) == NULL((void *)0)) |
| 446 | err(1, NULL((void *)0)); |
| 447 | |
| 448 | /* |
| 449 | * For each argument to utility, if we have not used up |
| 450 | * the number of replacements we are allowed to do, and |
| 451 | * if the argument contains at least one occurrence of |
| 452 | * replstr, call strnsubst(), else just save the string. |
| 453 | * Iterations over elements of avj and tmp are done |
| 454 | * where appropriate. |
| 455 | */ |
| 456 | while (--argc) { |
| 457 | *tmp = *avj++; |
| 458 | if (repls && strstr(*tmp, replstr) != NULL((void *)0)) { |
| 459 | strnsubst(tmp++, replstr, inpline, (size_t)255); |
| 460 | if (repls > 0) |
| 461 | repls--; |
| 462 | } else { |
| 463 | if ((*tmp = strdup(*tmp)) == NULL((void *)0)) |
| 464 | err(1, NULL((void *)0)); |
| 465 | tmp++; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * Run it. |
| 471 | */ |
| 472 | *tmp = NULL((void *)0); |
| 473 | run(tmp2); |
| 474 | |
| 475 | /* |
| 476 | * Walk from the tail to the head, free along the way. |
| 477 | */ |
| 478 | for (; tmp2 != tmp; tmp--) |
| 479 | free(*tmp); |
| 480 | /* |
| 481 | * Now free the list itself. |
| 482 | */ |
| 483 | free(tmp2); |
| 484 | |
| 485 | /* |
| 486 | * Free the input line buffer, if we have one. |
| 487 | */ |
| 488 | free(inpline); |
| 489 | inpline = NULL((void *)0); |
| 490 | } |
| 491 | |
| 492 | static void |
| 493 | run(char **argv) |
| 494 | { |
| 495 | pid_t pid; |
| 496 | int fd; |
| 497 | char **avec; |
| 498 | |
| 499 | /* |
| 500 | * If the user wants to be notified of each command before it is |
| 501 | * executed, notify them. If they want the notification to be |
| 502 | * followed by a prompt, then prompt them. |
| 503 | */ |
| 504 | if (tflag || pflag) { |
| 505 | fprintf(stderr(&__sF[2]), "%s", *argv); |
| 506 | for (avec = argv + 1; *avec != NULL((void *)0); ++avec) |
| 507 | fprintf(stderr(&__sF[2]), " %s", *avec); |
| 508 | /* |
| 509 | * If the user has asked to be prompted, do so. |
| 510 | */ |
| 511 | if (pflag) |
| 512 | /* |
| 513 | * If they asked not to exec, return without execution |
| 514 | * but if they asked to, go to the execution. If we |
| 515 | * could not open their tty, break the switch and drop |
| 516 | * back to -t behaviour. |
| 517 | */ |
| 518 | switch (prompt()) { |
| 519 | case 0: |
| 520 | return; |
| 521 | case 1: |
| 522 | goto exec; |
| 523 | case 2: |
| 524 | break; |
| 525 | } |
| 526 | fprintf(stderr(&__sF[2]), "\n"); |
| 527 | fflush(stderr(&__sF[2])); |
| 528 | } |
| 529 | exec: |
| 530 | switch (pid = vfork()) { |
Although the value stored to 'pid' is used in the enclosing expression, the value is never actually read from 'pid' | |
| 531 | case -1: |
| 532 | err(1, "vfork"); |
| 533 | case 0: |
| 534 | if (oflag) { |
| 535 | if ((fd = open(_PATH_TTY"/dev/tty", O_RDONLY0x0000)) == -1) { |
| 536 | warn("can't open /dev/tty"); |
| 537 | _exit(1); |
| 538 | } |
| 539 | } else { |
| 540 | fd = open(_PATH_DEVNULL"/dev/null", O_RDONLY0x0000); |
| 541 | } |
| 542 | if (fd > STDIN_FILENO0) { |
| 543 | if (dup2(fd, STDIN_FILENO0) != 0) { |
| 544 | warn("can't dup2 to stdin"); |
| 545 | _exit(1); |
| 546 | } |
| 547 | close(fd); |
| 548 | } |
| 549 | execvp(argv[0], argv); |
| 550 | warn("%s", argv[0]); |
| 551 | _exit(errno(*__errno()) == ENOENT2 ? 127 : 126); |
| 552 | } |
| 553 | curprocs++; |
| 554 | waitchildren(*argv, 0); |
| 555 | } |
| 556 | |
| 557 | static void |
| 558 | waitchildren(const char *name, int waitall) |
| 559 | { |
| 560 | pid_t pid; |
| 561 | int status; |
| 562 | |
| 563 | while ((pid = waitpid(-1, &status, !waitall && curprocs < maxprocs ? |
| 564 | WNOHANG1 : 0)) > 0) { |
| 565 | curprocs--; |
| 566 | /* |
| 567 | * According to POSIX, we have to exit if the utility exits |
| 568 | * with a 255 status, or is interrupted by a signal. |
| 569 | * We are allowed to return any exit status between 1 and |
| 570 | * 125 in these cases, but we'll use 124 and 125, the same |
| 571 | * values used by GNU xargs. |
| 572 | */ |
| 573 | if (WIFEXITED(status)(((status) & 0177) == 0)) { |
| 574 | if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) == 255) { |
| 575 | warnx("%s exited with status 255", name); |
| 576 | exit(124); |
| 577 | } else if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) == 127 || |
| 578 | WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) == 126) { |
| 579 | exit(WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff)); |
| 580 | } else if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) { |
| 581 | rval = 123; |
| 582 | } |
| 583 | } else if (WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0)) { |
| 584 | if (WTERMSIG(status)(((status) & 0177)) != SIGPIPE13) { |
| 585 | if (WTERMSIG(status)(((status) & 0177)) < NSIG33) |
| 586 | warnx("%s terminated by SIG%s", name, |
| 587 | sys_signame[WTERMSIG(status)(((status) & 0177))]); |
| 588 | else |
| 589 | warnx("%s terminated by signal %d", |
| 590 | name, WTERMSIG(status)(((status) & 0177))); |
| 591 | } |
| 592 | exit(125); |
| 593 | } |
| 594 | } |
| 595 | if (pid == -1 && errno(*__errno()) != ECHILD10) |
| 596 | err(1, "waitpid"); |
| 597 | } |
| 598 | |
| 599 | /* |
| 600 | * Prompt the user about running a command. |
| 601 | */ |
| 602 | static int |
| 603 | prompt(void) |
| 604 | { |
| 605 | size_t rsize; |
| 606 | char *response; |
| 607 | FILE *ttyfp; |
| 608 | int doit = 0; |
| 609 | |
| 610 | if ((ttyfp = fopen(_PATH_TTY"/dev/tty", "r")) == NULL((void *)0)) |
| 611 | return (2); /* Indicate that the TTY failed to open. */ |
| 612 | fprintf(stderr(&__sF[2]), "?..."); |
| 613 | fflush(stderr(&__sF[2])); |
| 614 | response = fgetln(ttyfp, &rsize); |
| 615 | doit = response != NULL((void *)0) && (*response == 'y' || *response == 'Y'); |
| 616 | fclose(ttyfp); |
| 617 | return (doit); |
| 618 | } |
| 619 | |
| 620 | static void |
| 621 | usage(void) |
| 622 | { |
| 623 | fprintf(stderr(&__sF[2]), |
| 624 | "usage: xargs [-0oprt] [-E eofstr] [-I replstr [-R replacements]] [-J replstr]\n" |
| 625 | " [-L number] [-n number [-x]] [-P maxprocs] [-s size]\n" |
| 626 | " [utility [argument ...]]\n"); |
| 627 | exit(1); |
| 628 | } |