1 /* $OpenBSD: timeout.c,v 1.26 2023/11/03 19:16:31 cheloha Exp $ */ 2 3 /* 4 * Copyright (c) 2021 Job Snijders <job@openbsd.org> 5 * Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org> 6 * Copyright (c) 2014 Vsevolod Stakhov <vsevolod@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer 14 * in this position and unchanged. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/time.h> 33 #include <sys/wait.h> 34 35 #include <ctype.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <getopt.h> 39 #include <limits.h> 40 #include <signal.h> 41 #include <stdbool.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #define EXIT_TIMEOUT 124 48 49 static volatile sig_atomic_t sig_chld = 0; 50 static volatile sig_atomic_t sig_term = 0; 51 static volatile sig_atomic_t sig_alrm = 0; 52 static volatile sig_atomic_t sig_ign = 0; 53 54 static void __dead 55 usage(void) 56 { 57 fprintf(stderr, 58 "usage: timeout [-fp] [-k time] [-s signal] duration command" 59 " [arg ...]\n"); 60 exit(1); 61 } 62 63 static double 64 parse_duration(const char *duration) 65 { 66 double ret; 67 char *suffix; 68 69 ret = strtod(duration, &suffix); 70 if (ret == 0 && suffix == duration) 71 errx(1, "duration is not a number"); 72 if (ret < 0 || ret >= 100000000UL) 73 errx(1, "duration out of range"); 74 75 if (suffix == NULL || *suffix == '\0') 76 return (ret); 77 78 if (suffix[1] != '\0') 79 errx(1, "duration unit suffix too long"); 80 81 switch (*suffix) { 82 case 's': 83 break; 84 case 'm': 85 ret *= 60; 86 break; 87 case 'h': 88 ret *= 60 * 60; 89 break; 90 case 'd': 91 ret *= 60 * 60 * 24; 92 break; 93 default: 94 errx(1, "duration unit suffix is invalid"); 95 } 96 97 return (ret); 98 } 99 100 static int 101 parse_signal(const char *str) 102 { 103 long long sig; 104 const char *errstr; 105 106 if (isalpha((unsigned char)*str)) { 107 int i; 108 109 if (strncasecmp(str, "SIG", 3) == 0) 110 str += 3; 111 for (i = 1; i < NSIG; i++) { 112 if (strcasecmp(str, sys_signame[i]) == 0) 113 return (i); 114 } 115 errx(1, "invalid signal name"); 116 } 117 118 sig = strtonum(str, 1, NSIG, &errstr); 119 if (errstr != NULL) 120 errx(1, "signal %s %s", str, errstr); 121 122 return (int)sig; 123 } 124 125 static void 126 sig_handler(int signo) 127 { 128 if (sig_ign != 0 && signo == sig_ign) { 129 sig_ign = 0; 130 return; 131 } 132 133 switch (signo) { 134 case SIGINT: 135 case SIGHUP: 136 case SIGQUIT: 137 case SIGTERM: 138 sig_term = signo; 139 break; 140 case SIGCHLD: 141 sig_chld = 1; 142 break; 143 case SIGALRM: 144 sig_alrm = 1; 145 break; 146 } 147 } 148 149 static void 150 set_interval(double iv) 151 { 152 struct itimerval tim; 153 154 memset(&tim, 0, sizeof(tim)); 155 tim.it_value.tv_sec = (time_t)iv; 156 iv -= (double)tim.it_value.tv_sec; 157 tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL); 158 159 if (setitimer(ITIMER_REAL, &tim, NULL) == -1) 160 err(1, "setitimer"); 161 } 162 163 int 164 main(int argc, char **argv) 165 { 166 int ch; 167 unsigned long i; 168 int foreground = 0, preserve = 0; 169 int pstat, status; 170 int killsig = SIGTERM; 171 pid_t pgid = 0, pid, cpid = 0; 172 double first_kill; 173 double second_kill = 0; 174 bool timedout = false; 175 bool do_second_kill = false; 176 struct sigaction signals; 177 int signums[] = {-1, SIGTERM, SIGINT, SIGHUP, SIGCHLD, 178 SIGALRM, SIGQUIT}; 179 180 const struct option longopts[] = { 181 { "preserve-status", no_argument, NULL, 'p'}, 182 { "foreground", no_argument, NULL, 'f'}, 183 { "kill-after", required_argument, NULL, 'k'}, 184 { "signal", required_argument, NULL, 's'}, 185 { "help", no_argument, NULL, 'h'}, 186 { NULL, 0, NULL, 0 } 187 }; 188 189 if (pledge("stdio proc exec", NULL) == -1) 190 err(1, "pledge"); 191 192 while ((ch = getopt_long(argc, argv, "+fk:ps:h", longopts, NULL)) 193 != -1) { 194 switch (ch) { 195 case 'f': 196 foreground = 1; 197 break; 198 case 'k': 199 do_second_kill = true; 200 second_kill = parse_duration(optarg); 201 break; 202 case 'p': 203 preserve = 1; 204 break; 205 case 's': 206 killsig = parse_signal(optarg); 207 break; 208 case 0: 209 break; 210 default: 211 usage(); 212 break; 213 } 214 } 215 216 argc -= optind; 217 argv += optind; 218 219 if (argc < 2) 220 usage(); 221 222 first_kill = parse_duration(argv[0]); 223 argc--; 224 argv++; 225 226 if (!foreground) { 227 pgid = setpgid(0, 0); 228 229 if (pgid == -1) 230 err(1, "setpgid"); 231 } 232 233 memset(&signals, 0, sizeof(signals)); 234 sigemptyset(&signals.sa_mask); 235 236 if (killsig != SIGKILL && killsig != SIGSTOP) 237 signums[0] = killsig; 238 239 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) 240 sigaddset(&signals.sa_mask, signums[i]); 241 242 signals.sa_handler = sig_handler; 243 signals.sa_flags = SA_RESTART; 244 245 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) { 246 if (signums[i] != -1 && signums[i] != 0 && 247 sigaction(signums[i], &signals, NULL) == -1) 248 err(1, "sigaction"); 249 } 250 251 signal(SIGTTIN, SIG_IGN); 252 signal(SIGTTOU, SIG_IGN); 253 254 pid = fork(); 255 if (pid == -1) 256 err(1, "fork"); 257 else if (pid == 0) { 258 /* child process */ 259 signal(SIGTTIN, SIG_DFL); 260 signal(SIGTTOU, SIG_DFL); 261 262 execvp(argv[0], argv); 263 warn("%s", argv[0]); 264 _exit(errno == ENOENT ? 127 : 126); 265 } 266 267 /* parent continues here */ 268 269 if (pledge("stdio proc", NULL) == -1) 270 err(1, "pledge"); 271 272 if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1) 273 err(1, "sigprocmask"); 274 275 set_interval(first_kill); 276 277 for (;;) { 278 sigemptyset(&signals.sa_mask); 279 sigsuspend(&signals.sa_mask); 280 281 if (sig_chld) { 282 sig_chld = 0; 283 while (((cpid = wait(&status)) < 0) && errno == EINTR) 284 continue; 285 286 if (cpid == pid) { 287 pstat = status; 288 break; 289 } 290 } else if (sig_alrm) { 291 sig_alrm = 0; 292 293 timedout = true; 294 if (!foreground) 295 killpg(pgid, killsig); 296 else 297 kill(pid, killsig); 298 299 if (do_second_kill) { 300 set_interval(second_kill); 301 second_kill = 0; 302 sig_ign = killsig; 303 killsig = SIGKILL; 304 } else 305 break; 306 307 } else if (sig_term) { 308 if (!foreground) 309 killpg(pgid, killsig); 310 else 311 kill(pid, (int)sig_term); 312 313 if (do_second_kill) { 314 set_interval(second_kill); 315 second_kill = 0; 316 sig_ign = killsig; 317 killsig = SIGKILL; 318 } else 319 break; 320 } 321 } 322 323 while (cpid != pid && wait(&pstat) == -1) { 324 if (errno != EINTR) 325 err(1, "wait"); 326 } 327 328 if (WEXITSTATUS(pstat)) 329 pstat = WEXITSTATUS(pstat); 330 else if (WIFSIGNALED(pstat)) 331 pstat = 128 + WTERMSIG(pstat); 332 333 if (timedout && !preserve) 334 pstat = EXIT_TIMEOUT; 335 336 return (pstat); 337 } 338