misc-utils/kill.c

   1 /*
   2  * Copyright (c) 1988, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 /*
  34  *  oct 5 1994 -- almost entirely re-written to allow for process names.
  35  *  modifications (c) salvatore valente <svalente@mit.edu>
  36  *  may be used / modified / distributed under the same terms as the original.
  37  *
  38  *  1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
  39  *  - added Native Language Support
  40  *
  41  *  1999-11-13 aeb Accept signal numers 128+s.
  42  *
  43  */
  44
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <ctype.h>              /* for isdigit() */
  49 #include <unistd.h>
  50 #include <signal.h>
  51
  52 #include "c.h"
  53 #include "kill.h"
  54 #include "nls.h"
  55 #include "closestream.h"
  56 #include "strutils.h"
  57
  58 struct signv {
  59         char *name;
  60         int val;
  61 } sys_signame[] = {
  62         /* POSIX signals */
  63         { "HUP",        SIGHUP },       /* 1 */
  64         { "INT",        SIGINT },       /* 2 */
  65         { "QUIT",       SIGQUIT },      /* 3 */
  66         { "ILL",        SIGILL },       /* 4 */
  67         { "ABRT",       SIGABRT },      /* 6 */
  68         { "FPE",        SIGFPE },       /* 8 */
  69         { "KILL",       SIGKILL },      /* 9 */
  70         { "SEGV",       SIGSEGV },      /* 11 */
  71         { "PIPE",       SIGPIPE },      /* 13 */
  72         { "ALRM",       SIGALRM },      /* 14 */
  73         { "TERM",       SIGTERM },      /* 15 */
  74         { "USR1",       SIGUSR1 },      /* 10 (arm,i386,m68k,ppc), 30 (alpha,sparc*), 16 (mips) */
  75         { "USR2",       SIGUSR2 },      /* 12 (arm,i386,m68k,ppc), 31 (alpha,sparc*), 17 (mips) */
  76         { "CHLD",       SIGCHLD },      /* 17 (arm,i386,m68k,ppc), 20 (alpha,sparc*), 18 (mips) */
  77         { "CONT",       SIGCONT },      /* 18 (arm,i386,m68k,ppc), 19 (alpha,sparc*), 25 (mips) */
  78         { "STOP",       SIGSTOP },      /* 19 (arm,i386,m68k,ppc), 17 (alpha,sparc*), 23 (mips) */
  79         { "TSTP",       SIGTSTP },      /* 20 (arm,i386,m68k,ppc), 18 (alpha,sparc*), 24 (mips) */
  80         { "TTIN",       SIGTTIN },      /* 21 (arm,i386,m68k,ppc,alpha,sparc*), 26 (mips) */
  81         { "TTOU",       SIGTTOU },      /* 22 (arm,i386,m68k,ppc,alpha,sparc*), 27 (mips) */
  82         /* Miscellaneous other signals */
  83 #ifdef SIGTRAP
  84         { "TRAP",       SIGTRAP },      /* 5 */
  85 #endif
  86 #ifdef SIGIOT
  87         { "IOT",        SIGIOT },       /* 6, same as SIGABRT */
  88 #endif
  89 #ifdef SIGEMT
  90         { "EMT",        SIGEMT },       /* 7 (mips,alpha,sparc*) */
  91 #endif
  92 #ifdef SIGBUS
  93         { "BUS",        SIGBUS },       /* 7 (arm,i386,m68k,ppc), 10 (mips,alpha,sparc*) */
  94 #endif
  95 #ifdef SIGSYS
  96         { "SYS",        SIGSYS },       /* 12 (mips,alpha,sparc*) */
  97 #endif
  98 #ifdef SIGSTKFLT
  99         { "STKFLT",     SIGSTKFLT },    /* 16 (arm,i386,m68k,ppc) */
 100 #endif
 101 #ifdef SIGURG
 102         { "URG",        SIGURG },       /* 23 (arm,i386,m68k,ppc), 16 (alpha,sparc*), 21 (mips) */
 103 #endif
 104 #ifdef SIGIO
 105         { "IO",         SIGIO },        /* 29 (arm,i386,m68k,ppc), 23 (alpha,sparc*), 22 (mips) */
 106 #endif
 107 #ifdef SIGPOLL
 108         { "POLL",       SIGPOLL },      /* same as SIGIO */
 109 #endif
 110 #ifdef SIGCLD
 111         { "CLD",        SIGCLD },       /* same as SIGCHLD (mips) */
 112 #endif
 113 #ifdef SIGXCPU
 114         { "XCPU",       SIGXCPU },      /* 24 (arm,i386,m68k,ppc,alpha,sparc*), 30 (mips) */
 115 #endif
 116 #ifdef SIGXFSZ
 117         { "XFSZ",       SIGXFSZ },      /* 25 (arm,i386,m68k,ppc,alpha,sparc*), 31 (mips) */
 118 #endif
 119 #ifdef SIGVTALRM
 120         { "VTALRM",     SIGVTALRM },    /* 26 (arm,i386,m68k,ppc,alpha,sparc*), 28 (mips) */
 121 #endif
 122 #ifdef SIGPROF
 123         { "PROF",       SIGPROF },      /* 27 (arm,i386,m68k,ppc,alpha,sparc*), 29 (mips) */
 124 #endif
 125 #ifdef SIGPWR
 126         { "PWR",        SIGPWR },       /* 30 (arm,i386,m68k,ppc), 29 (alpha,sparc*), 19 (mips) */
 127 #endif
 128 #ifdef SIGINFO
 129         { "INFO",       SIGINFO },      /* 29 (alpha) */
 130 #endif
 131 #ifdef SIGLOST
 132         { "LOST",       SIGLOST },      /* 29 (arm,i386,m68k,ppc,sparc*) */
 133 #endif
 134 #ifdef SIGWINCH
 135         { "WINCH",      SIGWINCH },     /* 28 (arm,i386,m68k,ppc,alpha,sparc*), 20 (mips) */
 136 #endif
 137 #ifdef SIGUNUSED
 138         { "UNUSED",     SIGUNUSED },    /* 31 (arm,i386,m68k,ppc) */
 139 #endif
 140 };
 141
 142 extern char *mybasename(char *);
 143
 144 static int arg_to_signum (char *arg, int mask);
 145 static void nosig (char *name);
 146 static void printsig (int sig);
 147 static void printsignals (FILE *fp);
 148 static int usage (int status);
 149 static int kill_verbose (char *procname, int pid, int sig);
 150
 151 static char *progname;
 152
 153 #ifdef HAVE_SIGQUEUE
 154 static int use_sigval;
 155 static union sigval sigdata;
 156 #endif
 157
 158 int main (int argc, char *argv[])
 159 {
 160     int errors, numsig, pid;
 161     char *ep, *arg, *p;
 162     int do_pid, do_kill, check_all;
 163     int *pids, *ip;
 164
 165     progname = argv[0];
 166     if ((p = strrchr(progname, '/')) != NULL)
 167             progname = p+1;
 168
 169     setlocale(LC_ALL, "");
 170     bindtextdomain(PACKAGE, LOCALEDIR);
 171     textdomain(PACKAGE);
 172     atexit(close_stdout);
 173
 174     numsig = SIGTERM;
 175     do_pid = (! strcmp (progname, "pid"));      /* Yecch */
 176     do_kill = 0;
 177     check_all = 0;
 178
 179     /*  loop through the arguments.
 180         actually, -a is the only option can be used with other options.
 181         `kill' is basically a one-option-at-most program.  */
 182     for (argc--, argv++; argc > 0; argc--, argv++) {
 183         arg = *argv;
 184         if (*arg != '-') {
 185             break;
 186         }
 187         if (! strcmp (arg, "--")) {
 188             argc--, argv++;
 189             break;
 190         }
 191         if (! strcmp (arg, "-v") || ! strcmp (arg, "-V") ||
 192             ! strcmp (arg, "--version")) {
 193             printf(UTIL_LINUX_VERSION);
 194             return 0;
 195         }
 196         if (! strcmp (arg, "-a")) {
 197             check_all++;
 198             continue;
 199         }
 200         if (! strcmp (arg, "-l")) {
 201             if (argc < 2) {
 202                 printsignals (stdout);
 203                 return 0;
 204             }
 205             if (argc > 2) {
 206                 return usage (1);
 207             }
 208             /* argc == 2, accept "kill -l $?" */
 209             arg = argv[1];
 210             if ((numsig = arg_to_signum (arg, 1)) < 0) {
 211                 fprintf (stderr, _("%s: unknown signal %s\n"), progname, arg);
 212                 return 1;
 213             }
 214             printsig (numsig);
 215             return 0;
 216         }
 217         if (! strcmp (arg, "-p")) {
 218             do_pid++;
 219             if (do_kill)
 220                 return usage (1);
 221             continue;
 222         }
 223         if (! strcmp (arg, "-s")) {
 224             if (argc < 2) {
 225                 return usage (1);
 226             }
 227             do_kill++;
 228             if (do_pid)
 229                 return usage (1);
 230             argc--, argv++;
 231             arg = *argv;
 232             if ((numsig = arg_to_signum (arg, 0)) < 0) {
 233                 nosig (arg);
 234                 return 1;
 235             }
 236             continue;
 237         }
 238         if (! strcmp (arg, "-q")) {
 239             if (argc < 2)
 240                 return usage (1);
 241             argc--, argv++;
 242             arg = *argv;
 243 #ifdef HAVE_SIGQUEUE
 244             sigdata.sival_int = strtos32_or_err(arg, _("invalid sigval argument"));
 245             use_sigval = 1;
 246 #endif
 247             continue;
 248         }
 249         /*  `arg' begins with a dash but is not a known option.
 250             so it's probably something like -HUP, or -1/-n
 251             try to deal with it.
 252             -n could be signal n, or pid -n (i.e. process group n).
 253             In case of doubt POSIX tells us to assume a signal.
 254             If a signal has been parsed, assume it's a pid, break */
 255         if (do_kill)
 256           break;
 257         arg++;
 258         if ((numsig = arg_to_signum (arg, 0)) < 0) {
 259             return usage (1);
 260         }
 261         do_kill++;
 262         if (do_pid)
 263             return usage (1);
 264         continue;
 265     }
 266
 267     if (! *argv) {
 268         return usage (1);
 269     }
 270     if (do_pid) {
 271         numsig = -1;
 272     }
 273
 274     /*  we're done with the options.
 275         the rest of the arguments should be process ids and names.
 276         kill them.  */
 277     for (errors = 0; (arg = *argv) != NULL; argv++) {
 278         pid = strtol (arg, &ep, 10);
 279         if (! *ep)
 280             errors += kill_verbose (arg, pid, numsig);
 281         else {
 282             pids = get_pids (arg, check_all);
 283             if (! pids) {
 284                 errors++;
 285                 fprintf (stderr, _("%s: can't find process \"%s\"\n"),
 286                          progname, arg);
 287                 continue;
 288             }
 289             for (ip = pids; *ip >= 0; ip++)
 290                 errors += kill_verbose (arg, *ip, numsig);
 291             free (pids);
 292         }
 293     }
 294     return (errors);
 295 }
 296
 297 #ifdef SIGRTMIN
 298 static int rtsig_to_signum(char *sig)
 299 {
 300         int num, maxi = 0;
 301         char *ep = NULL;
 302
 303         if (strncasecmp(sig, "min+", 4) == 0)
 304                 sig += 4;
 305         else if (strncasecmp(sig, "max-", 4) == 0) {
 306                 sig += 4;
 307                 maxi = 1;
 308         }
 309
 310         if (!isdigit(*sig))
 311                 return -1;
 312
 313         errno = 0;
 314         num = strtol(sig, &ep, 10);
 315         if (!ep || sig == ep || errno || num < 0)
 316                 return -1;
 317
 318         num = maxi ? SIGRTMAX - num : SIGRTMIN + num;
 319
 320         if (num < SIGRTMIN || num > SIGRTMAX)
 321                 return -1;
 322
 323         return num;
 324 }
 325 #endif
 326
 327 static int signame_to_signum (char *sig)
 328 {
 329     size_t n;
 330
 331     if (! strncasecmp (sig, "sig", 3))
 332         sig += 3;
 333
 334 #ifdef SIGRTMIN
 335     /* RT signals */
 336     if (!strncasecmp(sig, "rt", 2))
 337         return rtsig_to_signum(sig + 2);
 338 #endif
 339     /* Normal sugnals */
 340     for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
 341         if (! strcasecmp (sys_signame[n].name, sig))
 342             return sys_signame[n].val;
 343     }
 344     return (-1);
 345 }
 346
 347 static int arg_to_signum (char *arg, int maskbit)
 348 {
 349     int numsig;
 350     char *ep;
 351
 352     if (isdigit (*arg)) {
 353         numsig = strtol (arg, &ep, 10);
 354         if (numsig >= NSIG && maskbit && (numsig & 128) != 0)
 355             numsig -= 128;
 356         if (*ep != 0 || numsig < 0 || numsig >= NSIG)
 357             return (-1);
 358         return (numsig);
 359     }
 360     return signame_to_signum (arg);
 361 }
 362
 363 static void nosig (char *name)
 364 {
 365     fprintf (stderr, _("%s: unknown signal %s; valid signals:\n"), progname, name);
 366     printsignals (stderr);
 367 }
 368
 369 static void printsig (int sig)
 370 {
 371     size_t n;
 372
 373     for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
 374         if (sys_signame[n].val == sig) {
 375             printf ("%s\n", sys_signame[n].name);
 376             return;
 377         }
 378     }
 379 #ifdef SIGRTMIN
 380     if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
 381         printf ("RT%d\n", sig - SIGRTMIN);
 382         return;
 383     }
 384 #endif
 385     printf("%d\n", sig);
 386 }
 387
 388 static void printsignals (FILE *fp)
 389 {
 390     size_t n, lth, lpos = 0;
 391
 392     for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
 393         lth = 1+strlen(sys_signame[n].name);
 394         if (lpos+lth > 72) {
 395             fputc ('\n', fp);
 396             lpos = 0;
 397         } else if (lpos)
 398             fputc (' ', fp);
 399         lpos += lth;
 400         fputs (sys_signame[n].name, fp);
 401     }
 402 #ifdef SIGRTMIN
 403     fputs (" RT<N> RTMIN+<N> RTMAX-<N>", fp);
 404 #endif
 405     fputc ('\n', fp);
 406 }
 407
 408 static int usage (int status)
 409 {
 410     FILE *fp;
 411
 412     fp = (status == 0 ? stdout : stderr);
 413     fprintf (fp, _("usage: %s [ -s signal | -p ] [ -a ] pid ...\n"), progname);
 414     fprintf (fp, _("       %s -l [ signal ]\n"), progname);
 415     return status;
 416 }
 417
 418 static int kill_verbose (char *procname, int pid, int sig)
 419 {
 420     int rc;
 421
 422     if (sig < 0) {
 423         printf ("%d\n", pid);
 424         return 0;
 425     }
 426 #ifdef HAVE_SIGQUEUE
 427     if (use_sigval)
 428         rc = sigqueue(pid, sig, sigdata);
 429     else
 430 #endif
 431         rc = kill (pid, sig);
 432
 433     if (rc < 0) {
 434         fprintf (stderr, "%s ", progname);
 435         perror (procname);
 436         return 1;
 437     }
 438     return 0;
 439 }