1 /*- 2 * Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org> 3 * Copyright (c) 2014 Vsevolod Stakhov <vsevolod@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 #include <sys/procctl.h> 30 #include <sys/time.h> 31 #include <sys/wait.h> 32 33 #include <err.h> 34 #include <errno.h> 35 #include <getopt.h> 36 #include <signal.h> 37 #include <stdbool.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #define EXIT_TIMEOUT 124 44 #define EXIT_INVALID 125 45 #define EXIT_CMD_ERROR 126 46 #define EXIT_CMD_NOENT 127 47 48 static volatile sig_atomic_t sig_chld = 0; 49 static volatile sig_atomic_t sig_term = 0; 50 static volatile sig_atomic_t sig_alrm = 0; 51 static volatile sig_atomic_t sig_ign = 0; 52 static const char *command = NULL; 53 static bool verbose = false; 54 55 static void __dead2 56 usage(void) 57 { 58 fprintf(stderr, 59 "Usage: %s [--foreground] [-k time | --kill-after time]" 60 " [--preserve-status] [-s signal | --signal signal] " 61 " [-v | --verbose] <duration> <command> [arg ...]\n", 62 getprogname()); 63 exit(EXIT_FAILURE); 64 } 65 66 static double 67 parse_duration(const char *duration) 68 { 69 double ret; 70 char *suffix; 71 72 ret = strtod(duration, &suffix); 73 if (suffix == duration) 74 errx(EXIT_INVALID, "duration is not a number"); 75 76 if (*suffix == '\0') 77 return (ret); 78 79 if (suffix[1] != '\0') 80 errx(EXIT_INVALID, "duration unit suffix too long"); 81 82 switch (*suffix) { 83 case 's': 84 break; 85 case 'm': 86 ret *= 60; 87 break; 88 case 'h': 89 ret *= 60 * 60; 90 break; 91 case 'd': 92 ret *= 60 * 60 * 24; 93 break; 94 default: 95 errx(EXIT_INVALID, "duration unit suffix invalid"); 96 } 97 98 if (ret < 0 || ret >= 100000000UL) 99 errx(EXIT_INVALID, "duration out of range"); 100 101 return (ret); 102 } 103 104 static int 105 parse_signal(const char *str) 106 { 107 int sig, i; 108 const char *errstr; 109 110 sig = strtonum(str, 1, sys_nsig - 1, &errstr); 111 if (errstr == NULL) 112 return (sig); 113 114 if (strncasecmp(str, "SIG", 3) == 0) 115 str += 3; 116 for (i = 1; i < sys_nsig; i++) { 117 if (strcasecmp(str, sys_signame[i]) == 0) 118 return (i); 119 } 120 121 errx(EXIT_INVALID, "invalid signal"); 122 } 123 124 static void 125 sig_handler(int signo) 126 { 127 if (sig_ign != 0 && signo == sig_ign) { 128 sig_ign = 0; 129 return; 130 } 131 132 switch (signo) { 133 case SIGINT: 134 case SIGHUP: 135 case SIGQUIT: 136 case SIGTERM: 137 sig_term = signo; 138 break; 139 case SIGCHLD: 140 sig_chld = 1; 141 break; 142 case SIGALRM: 143 sig_alrm = 1; 144 break; 145 } 146 } 147 148 static void 149 send_sig(pid_t pid, int signo) 150 { 151 if (verbose) { 152 warnx("sending signal %s(%d) to command '%s'", 153 sys_signame[signo], signo, command); 154 } 155 kill(pid, signo); 156 } 157 158 static void 159 set_interval(double iv) 160 { 161 struct itimerval tim; 162 163 memset(&tim, 0, sizeof(tim)); 164 if (iv > 0) { 165 tim.it_value.tv_sec = (time_t)iv; 166 iv -= (double)(time_t)iv; 167 tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL); 168 } 169 170 if (setitimer(ITIMER_REAL, &tim, NULL) == -1) 171 err(EXIT_FAILURE, "setitimer()"); 172 } 173 174 int 175 main(int argc, char **argv) 176 { 177 int ch, status, sig; 178 int foreground, preserve; 179 int pstat = 0; 180 int killsig = SIGTERM; 181 size_t i; 182 pid_t pid, cpid; 183 double first_kill; 184 double second_kill; 185 bool timedout = false; 186 bool do_second_kill = false; 187 bool child_done = false; 188 struct sigaction signals; 189 struct procctl_reaper_status info; 190 struct procctl_reaper_kill killemall; 191 int signums[] = { 192 -1, 193 SIGTERM, 194 SIGINT, 195 SIGHUP, 196 SIGCHLD, 197 SIGALRM, 198 SIGQUIT, 199 }; 200 201 foreground = preserve = 0; 202 second_kill = 0; 203 204 const struct option longopts[] = { 205 { "foreground", no_argument, &foreground, 1 }, 206 { "help", no_argument, NULL, 'h' }, 207 { "kill-after", required_argument, NULL, 'k' }, 208 { "preserve-status", no_argument, &preserve, 1 }, 209 { "signal", required_argument, NULL, 's' }, 210 { "verbose", no_argument, NULL, 'v' }, 211 { NULL, 0, NULL, 0 }, 212 }; 213 214 while ((ch = getopt_long(argc, argv, "+k:s:vh", longopts, NULL)) != -1) { 215 switch (ch) { 216 case 'k': 217 do_second_kill = true; 218 second_kill = parse_duration(optarg); 219 break; 220 case 's': 221 killsig = parse_signal(optarg); 222 break; 223 case 'v': 224 verbose = true; 225 break; 226 case 0: 227 break; 228 default: 229 usage(); 230 } 231 } 232 233 argc -= optind; 234 argv += optind; 235 if (argc < 2) 236 usage(); 237 238 first_kill = parse_duration(argv[0]); 239 argc--; 240 argv++; 241 command = argv[0]; 242 243 if (!foreground) { 244 /* Acquire a reaper */ 245 if (procctl(P_PID, getpid(), PROC_REAP_ACQUIRE, NULL) == -1) 246 err(EXIT_FAILURE, "procctl(PROC_REAP_ACQUIRE)"); 247 } 248 249 memset(&signals, 0, sizeof(signals)); 250 sigemptyset(&signals.sa_mask); 251 252 if (killsig != SIGKILL && killsig != SIGSTOP) 253 signums[0] = killsig; 254 255 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) 256 sigaddset(&signals.sa_mask, signums[i]); 257 258 signals.sa_handler = sig_handler; 259 signals.sa_flags = SA_RESTART; 260 261 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) { 262 if (signums[i] > 0 && 263 sigaction(signums[i], &signals, NULL) == -1) 264 err(EXIT_FAILURE, "sigaction()"); 265 } 266 267 /* Don't stop if background child needs TTY */ 268 signal(SIGTTIN, SIG_IGN); 269 signal(SIGTTOU, SIG_IGN); 270 271 pid = fork(); 272 if (pid == -1) { 273 err(EXIT_FAILURE, "fork()"); 274 } else if (pid == 0) { 275 /* child process */ 276 signal(SIGTTIN, SIG_DFL); 277 signal(SIGTTOU, SIG_DFL); 278 279 execvp(argv[0], argv); 280 warn("exec(%s)", argv[0]); 281 _exit(errno == ENOENT ? EXIT_CMD_NOENT : EXIT_CMD_ERROR); 282 } 283 284 /* parent continues here */ 285 286 if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1) 287 err(EXIT_FAILURE, "sigprocmask()"); 288 289 set_interval(first_kill); 290 sigemptyset(&signals.sa_mask); 291 292 for (;;) { 293 sigsuspend(&signals.sa_mask); 294 295 if (sig_chld) { 296 sig_chld = 0; 297 298 while ((cpid = waitpid(-1, &status, WNOHANG)) != 0) { 299 if (cpid < 0) { 300 if (errno != EINTR) 301 break; 302 } else if (cpid == pid) { 303 pstat = status; 304 child_done = true; 305 } 306 } 307 if (child_done) { 308 if (foreground) { 309 break; 310 } else { 311 procctl(P_PID, getpid(), 312 PROC_REAP_STATUS, &info); 313 if (info.rs_children == 0) 314 break; 315 } 316 } 317 } else if (sig_alrm || sig_term) { 318 if (sig_alrm) { 319 sig = killsig; 320 sig_alrm = 0; 321 timedout = true; 322 } else { 323 sig = sig_term; 324 sig_term = 0; 325 } 326 327 if (foreground) { 328 send_sig(pid, sig); 329 } else { 330 killemall.rk_sig = sig; 331 killemall.rk_flags = 0; 332 procctl(P_PID, getpid(), PROC_REAP_KILL, 333 &killemall); 334 } 335 336 if (do_second_kill) { 337 set_interval(second_kill); 338 do_second_kill = false; 339 sig_ign = killsig; 340 killsig = SIGKILL; 341 } else { 342 break; 343 } 344 } 345 } 346 347 while (!child_done && wait(&pstat) == -1) { 348 if (errno != EINTR) 349 err(EXIT_FAILURE, "wait()"); 350 } 351 352 if (!foreground) 353 procctl(P_PID, getpid(), PROC_REAP_RELEASE, NULL); 354 355 if (timedout && !preserve) { 356 pstat = EXIT_TIMEOUT; 357 } else { 358 if (WIFEXITED(pstat)) 359 pstat = WEXITSTATUS(pstat); 360 else if (WIFSIGNALED(pstat)) 361 pstat = 128 + WTERMSIG(pstat); 362 } 363 364 return (pstat); 365 } 366