timeout.c revision 1.1
1 /*- 2 * Copyright (c) 2014 Baptiste Daroussin <bapt (at) FreeBSD.org> 3 * Copyright (c) 2014 Vsevolod Stakhov <vsevolod (at) FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: head/usr.bin/timeout/timeout.c 268763 2014-07-16 13:52:05Z bapt $"); 30 31 #include <sys/time.h> 32 #include <sys/wait.h> 33 34 #include <err.h> 35 #include <errno.h> 36 #include <getopt.h> 37 #include <signal.h> 38 #include <stdbool.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <sysexits.h> 43 #include <unistd.h> 44 45 #define EXIT_TIMEOUT 124 46 47 static sig_atomic_t sig_chld = 0; 48 static sig_atomic_t sig_term = 0; 49 static sig_atomic_t sig_alrm = 0; 50 static sig_atomic_t sig_ign = 0; 51 52 static void 53 usage(void) 54 { 55 56 fprintf(stderr, "Usage: %s [--signal sig | -s sig] [--preserve-status]" 57 " [--kill-after time | -k time] [--foreground] <duration> <command>" 58 " <arg ...>\n", getprogname()); 59 60 exit(EX_USAGE); 61 } 62 63 static double 64 parse_duration(const char *duration) 65 { 66 double ret; 67 char *end; 68 69 ret = strtod(duration, &end); 70 if (ret == 0 && end == duration) 71 errx(EXIT_FAILURE, "invalid duration"); 72 73 if (end == NULL || *end == '\0') 74 return (ret); 75 76 if (end != NULL && *(end + 1) != '\0') 77 errx(EX_USAGE, "invalid duration"); 78 79 switch (*end) { 80 case 's': 81 break; 82 case 'm': 83 ret *= 60; 84 break; 85 case 'h': 86 ret *= 60 * 60; 87 break; 88 case 'd': 89 ret *= 60 * 60 * 24; 90 break; 91 default: 92 errx(EX_USAGE, "invalid duration"); 93 } 94 95 if (ret < 0 || ret >= 100000000UL) 96 errx(EX_USAGE, "invalid duration"); 97 98 return (ret); 99 } 100 101 static int 102 parse_signal(const char *str) 103 { 104 int sig, i; 105 const char *errstr; 106 107 sig = strtonum(str, 0, sys_nsig, &errstr); 108 109 if (errstr == NULL) 110 return (sig); 111 if (strncasecmp(str, "SIG", 3) == 0) 112 str += 3; 113 114 for (i = 1; i < sys_nsig; i++) { 115 if (strcasecmp(str, sys_signame[i]) == 0) 116 return (i); 117 } 118 119 errx(EX_USAGE, "invalid signal"); 120 } 121 122 static void 123 sig_handler(int signo) 124 { 125 if (sig_ign != 0 && signo == sig_ign) { 126 sig_ign = 0; 127 return; 128 } 129 130 switch(signo) { 131 case 0: 132 case SIGINT: 133 case SIGHUP: 134 case SIGQUIT: 135 case SIGTERM: 136 sig_term = signo; 137 break; 138 case SIGCHLD: 139 sig_chld = 1; 140 break; 141 case SIGALRM: 142 sig_alrm = 1; 143 break; 144 } 145 } 146 147 static void 148 set_interval(double iv) 149 { 150 struct itimerval tim; 151 152 memset(&tim, 0, sizeof(tim)); 153 tim.it_value.tv_sec = (time_t)iv; 154 iv -= (time_t)iv; 155 tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL); 156 157 if (setitimer(ITIMER_REAL, &tim, NULL) == -1) 158 err(EX_OSERR, "setitimer()"); 159 } 160 161 int 162 main(int argc, char **argv) 163 { 164 int ch; 165 unsigned long i; 166 int foreground, preserve; 167 int error, pstat, status; 168 int killsig = SIGTERM; 169 pid_t pgid, pid, cpid; 170 double first_kill; 171 double second_kill; 172 bool timedout = false; 173 bool do_second_kill = false; 174 struct sigaction signals; 175 int signums[] = { 176 -1, 177 SIGTERM, 178 SIGINT, 179 SIGHUP, 180 SIGCHLD, 181 SIGALRM, 182 SIGQUIT, 183 }; 184 185 foreground = preserve = 0; 186 second_kill = 0; 187 cpid = -1; 188 pgid = -1; 189 190 const struct option longopts[] = { 191 { "preserve-status", no_argument, &preserve, 1 }, 192 { "foreground", no_argument, &foreground, 1 }, 193 { "kill-after", required_argument, NULL, 'k'}, 194 { "signal", required_argument, NULL, 's'}, 195 { "help", no_argument, NULL, 'h'}, 196 { NULL, 0, NULL, 0 } 197 }; 198 199 while ((ch = getopt_long(argc, argv, "+k:s:h", longopts, NULL)) != -1) { 200 switch (ch) { 201 case 'k': 202 do_second_kill = true; 203 second_kill = parse_duration(optarg); 204 break; 205 case 's': 206 killsig = parse_signal(optarg); 207 break; 208 case 0: 209 break; 210 case 'h': 211 default: 212 usage(); 213 break; 214 } 215 } 216 217 argc -= optind; 218 argv += optind; 219 220 if (argc < 2) 221 usage(); 222 223 first_kill = parse_duration(argv[0]); 224 argc--; 225 argv++; 226 227 if (!foreground) { 228 pgid = setpgid(0,0); 229 230 if (pgid == -1) 231 err(EX_OSERR, "setpgid()"); 232 } 233 234 memset(&signals, 0, sizeof(signals)); 235 sigemptyset(&signals.sa_mask); 236 237 if (killsig != SIGKILL && killsig != SIGSTOP) 238 signums[0] = killsig; 239 240 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i ++) 241 sigaddset(&signals.sa_mask, signums[i]); 242 243 signals.sa_handler = sig_handler; 244 signals.sa_flags = SA_RESTART; 245 246 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i ++) 247 if (signums[i] != -1 && signums[i] != 0 && 248 sigaction(signums[i], &signals, NULL) == -1) 249 err(EX_OSERR, "sigaction()"); 250 251 signal(SIGTTIN, SIG_IGN); 252 signal(SIGTTOU, SIG_IGN); 253 254 pid = fork(); 255 if (pid == -1) 256 err(EX_OSERR, "fork()"); 257 else if (pid == 0) { 258 /* child process */ 259 signal(SIGTTIN, SIG_DFL); 260 signal(SIGTTOU, SIG_DFL); 261 262 error = execvp(argv[0], argv); 263 if (error == -1) 264 err(EX_UNAVAILABLE, "exec()"); 265 } 266 267 if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1) 268 err(EX_OSERR, "sigprocmask()"); 269 270 /* parent continues here */ 271 set_interval(first_kill); 272 273 for (;;) { 274 sigemptyset(&signals.sa_mask); 275 sigsuspend(&signals.sa_mask); 276 277 if (sig_chld) { 278 sig_chld = 0; 279 while (((cpid = wait(&status)) < 0) && errno == EINTR) 280 continue; 281 282 if (cpid == pid) { 283 pstat = status; 284 break; 285 } 286 } else if (sig_alrm) { 287 sig_alrm = 0; 288 289 timedout = true; 290 if (!foreground) 291 killpg(pgid, killsig); 292 else 293 kill(pid, killsig); 294 295 if (do_second_kill) { 296 set_interval(second_kill); 297 second_kill = 0; 298 sig_ign = killsig; 299 killsig = SIGKILL; 300 } else 301 break; 302 303 } else if (sig_term) { 304 if (!foreground) 305 killpg(pgid, killsig); 306 else 307 kill(pid, sig_term); 308 309 if (do_second_kill) { 310 set_interval(second_kill); 311 second_kill = 0; 312 sig_ign = killsig; 313 killsig = SIGKILL; 314 } else 315 break; 316 } 317 } 318 319 while (cpid != pid && wait(&pstat) == -1) { 320 if (errno != EINTR) 321 err(EX_OSERR, "waitpid()"); 322 } 323 324 if (WEXITSTATUS(pstat)) 325 pstat = WEXITSTATUS(pstat); 326 else if(WIFSIGNALED(pstat)) 327 pstat = 128 + WTERMSIG(pstat); 328 329 if (timedout && !preserve) 330 pstat = EXIT_TIMEOUT; 331 332 return (pstat); 333 } 334
Indexes created Thu Sep 25 16:09:42 GMT 2025