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 __FBSDID("$FreeBSD$"); 30 31 #include <sys/procctl.h> 32 #include <sys/time.h> 33 #include <sys/wait.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <getopt.h> 38 #include <signal.h> 39 #include <stdbool.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.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(EXIT_FAILURE); 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(125, "invalid duration"); 72 73 if (end == NULL || *end == '\0') 74 return (ret); 75 76 if (end != NULL && *(end + 1) != '\0') 77 errx(125, "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(125, "invalid duration"); 93 } 94 95 if (ret < 0 || ret >= 100000000UL) 96 errx(125, "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, 1, sys_nsig - 1, &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(125, "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(EXIT_FAILURE, "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 pid, cpid; 170 double first_kill; 171 double second_kill; 172 bool timedout = false; 173 bool do_second_kill = false; 174 bool child_done = false; 175 struct sigaction signals; 176 struct procctl_reaper_status info; 177 struct procctl_reaper_kill killemall; 178 int signums[] = { 179 -1, 180 SIGTERM, 181 SIGINT, 182 SIGHUP, 183 SIGCHLD, 184 SIGALRM, 185 SIGQUIT, 186 }; 187 188 foreground = preserve = 0; 189 second_kill = 0; 190 191 const struct option longopts[] = { 192 { "preserve-status", no_argument, &preserve, 1 }, 193 { "foreground", no_argument, &foreground, 1 }, 194 { "kill-after", required_argument, NULL, 'k'}, 195 { "signal", required_argument, NULL, 's'}, 196 { "help", no_argument, NULL, 'h'}, 197 { NULL, 0, NULL, 0 } 198 }; 199 200 while ((ch = getopt_long(argc, argv, "+k:s:h", longopts, NULL)) != -1) { 201 switch (ch) { 202 case 'k': 203 do_second_kill = true; 204 second_kill = parse_duration(optarg); 205 break; 206 case 's': 207 killsig = parse_signal(optarg); 208 break; 209 case 0: 210 break; 211 case 'h': 212 default: 213 usage(); 214 break; 215 } 216 } 217 218 argc -= optind; 219 argv += optind; 220 221 if (argc < 2) 222 usage(); 223 224 first_kill = parse_duration(argv[0]); 225 argc--; 226 argv++; 227 228 if (!foreground) { 229 /* Acquire a reaper */ 230 if (procctl(P_PID, getpid(), PROC_REAP_ACQUIRE, NULL) == -1) 231 err(EXIT_FAILURE, "Fail to acquire the reaper"); 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(EXIT_FAILURE, "sigaction()"); 250 251 signal(SIGTTIN, SIG_IGN); 252 signal(SIGTTOU, SIG_IGN); 253 254 pid = fork(); 255 if (pid == -1) 256 err(EXIT_FAILURE, "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 if (errno == ENOENT) 265 err(127, "exec(%s)", argv[0]); 266 else 267 err(126, "exec(%s)", argv[0]); 268 } 269 } 270 271 if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1) 272 err(EXIT_FAILURE, "sigprocmask()"); 273 274 /* parent continues here */ 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; 283 284 while ((cpid = waitpid(-1, &status, WNOHANG)) != 0) { 285 if (cpid < 0) { 286 if (errno == EINTR) 287 continue; 288 else 289 break; 290 } else if (cpid == pid) { 291 pstat = status; 292 child_done = true; 293 } 294 } 295 if (child_done) { 296 if (foreground) { 297 break; 298 } else { 299 procctl(P_PID, getpid(), 300 PROC_REAP_STATUS, &info); 301 if (info.rs_children == 0) 302 break; 303 } 304 } 305 } else if (sig_alrm) { 306 sig_alrm = 0; 307 308 timedout = true; 309 if (!foreground) { 310 killemall.rk_sig = killsig; 311 killemall.rk_flags = 0; 312 procctl(P_PID, getpid(), PROC_REAP_KILL, 313 &killemall); 314 } else 315 kill(pid, killsig); 316 317 if (do_second_kill) { 318 set_interval(second_kill); 319 second_kill = 0; 320 sig_ign = killsig; 321 killsig = SIGKILL; 322 } else 323 break; 324 325 } else if (sig_term) { 326 if (!foreground) { 327 killemall.rk_sig = sig_term; 328 killemall.rk_flags = 0; 329 procctl(P_PID, getpid(), PROC_REAP_KILL, 330 &killemall); 331 } else 332 kill(pid, sig_term); 333 334 if (do_second_kill) { 335 set_interval(second_kill); 336 second_kill = 0; 337 sig_ign = killsig; 338 killsig = SIGKILL; 339 } else 340 break; 341 } 342 } 343 344 while (!child_done && wait(&pstat) == -1) { 345 if (errno != EINTR) 346 err(EXIT_FAILURE, "waitpid()"); 347 } 348 349 if (!foreground) 350 procctl(P_PID, getpid(), PROC_REAP_RELEASE, NULL); 351 352 if (WEXITSTATUS(pstat)) 353 pstat = WEXITSTATUS(pstat); 354 else if (WIFSIGNALED(pstat)) 355 pstat = 128 + WTERMSIG(pstat); 356 357 if (timedout && !preserve) 358 pstat = EXIT_TIMEOUT; 359 360 return (pstat); 361 } 362