1 /*- 2 * Copyright (c) 2004-2009, Jilles Tjoelker 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with 6 * or without modification, are permitted provided that the 7 * following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above 10 * copyright notice, this list of conditions and the 11 * following disclaimer. 12 * 2. Redistributions in binary form must reproduce the 13 * above copyright notice, this list of conditions and 14 * the following disclaimer in the documentation and/or 15 * other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 18 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED 19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 21 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY 23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 30 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 31 * OF SUCH DAMAGE. 32 */ 33 34 #include <sys/types.h> 35 #include <sys/event.h> 36 #include <sys/time.h> 37 #include <sys/wait.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <signal.h> 42 #include <stdbool.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <sysexits.h> 47 #include <unistd.h> 48 49 static void 50 usage(void) 51 { 52 fprintf(stderr, "usage: pwait [-t timeout] [-ov] pid ...\n"); 53 exit(EX_USAGE); 54 } 55 56 /* 57 * pwait - wait for processes to terminate 58 */ 59 int 60 main(int argc, char *argv[]) 61 { 62 struct itimerval itv; 63 struct kevent *e; 64 char *end, *s; 65 double timeout; 66 long pid; 67 pid_t mypid; 68 int i, kq, n, nleft, opt, status; 69 bool oflag, tflag, verbose; 70 71 oflag = false; 72 tflag = false; 73 verbose = false; 74 memset(&itv, 0, sizeof(itv)); 75 76 while ((opt = getopt(argc, argv, "ot:v")) != -1) { 77 switch (opt) { 78 case 'o': 79 oflag = 1; 80 break; 81 case 't': 82 tflag = true; 83 errno = 0; 84 timeout = strtod(optarg, &end); 85 if (end == optarg || errno == ERANGE || timeout < 0) { 86 errx(EX_DATAERR, "timeout value"); 87 } 88 switch (*end) { 89 case '\0': 90 break; 91 case 's': 92 end++; 93 break; 94 case 'h': 95 timeout *= 60; 96 /* FALLTHROUGH */ 97 case 'm': 98 timeout *= 60; 99 end++; 100 break; 101 default: 102 errx(EX_DATAERR, "timeout unit"); 103 } 104 if (*end != '\0') { 105 errx(EX_DATAERR, "timeout unit"); 106 } 107 if (timeout > 100000000L) { 108 errx(EX_DATAERR, "timeout value"); 109 } 110 itv.it_value.tv_sec = (time_t)timeout; 111 timeout -= (time_t)timeout; 112 itv.it_value.tv_usec = 113 (suseconds_t)(timeout * 1000000UL); 114 break; 115 case 'v': 116 verbose = true; 117 break; 118 default: 119 usage(); 120 /* NOTREACHED */ 121 } 122 } 123 124 argc -= optind; 125 argv += optind; 126 127 if (argc == 0) { 128 usage(); 129 } 130 131 kq = kqueue(); 132 if (kq == -1) { 133 err(EX_OSERR, "kqueue"); 134 } 135 136 e = malloc((argc + tflag) * sizeof(struct kevent)); 137 if (e == NULL) { 138 err(EX_OSERR, "malloc"); 139 } 140 nleft = 0; 141 mypid = getpid(); 142 for (n = 0; n < argc; n++) { 143 s = argv[n]; 144 /* Undocumented Solaris compat */ 145 if (strncmp(s, "/proc/", 6) == 0) { 146 s += 6; 147 } 148 errno = 0; 149 pid = strtol(s, &end, 10); 150 if (pid < 0 || *end != '\0' || errno != 0) { 151 warnx("%s: bad process id", s); 152 continue; 153 } 154 if (pid == mypid) { 155 warnx("%s: skipping my own pid", s); 156 continue; 157 } 158 for (i = 0; i < nleft; i++) { 159 if (e[i].ident == (uintptr_t)pid) { 160 break; 161 } 162 } 163 if (i < nleft) { 164 /* Duplicate. */ 165 continue; 166 } 167 EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 168 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) { 169 warn("%ld", pid); 170 if (oflag) { 171 exit(EX_OK); 172 } 173 } else { 174 nleft++; 175 } 176 } 177 178 if (nleft > 0 && tflag) { 179 /* 180 * Explicitly detect SIGALRM so that an exit status of 124 181 * can be returned rather than 142. 182 */ 183 EV_SET(e + nleft, SIGALRM, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 184 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) { 185 err(EX_OSERR, "kevent"); 186 } 187 /* Ignore SIGALRM to not interrupt kevent(2). */ 188 signal(SIGALRM, SIG_IGN); 189 if (setitimer(ITIMER_REAL, &itv, NULL) == -1) { 190 err(EX_OSERR, "setitimer"); 191 } 192 } 193 while (nleft > 0) { 194 n = kevent(kq, NULL, 0, e, nleft + tflag, NULL); 195 if (n == -1) { 196 err(EX_OSERR, "kevent"); 197 } 198 for (i = 0; i < n; i++) { 199 if (e[i].filter == EVFILT_SIGNAL) { 200 if (verbose) { 201 printf("timeout\n"); 202 } 203 exit(124); 204 } 205 if (verbose) { 206 status = e[i].data; 207 if (WIFEXITED(status)) { 208 printf("%ld: exited with status %d.\n", 209 (long)e[i].ident, 210 WEXITSTATUS(status)); 211 } else if (WIFSIGNALED(status)) { 212 printf("%ld: killed by signal %d.\n", 213 (long)e[i].ident, 214 WTERMSIG(status)); 215 } else { 216 printf("%ld: terminated.\n", 217 (long)e[i].ident); 218 } 219 } 220 if (oflag) { 221 exit(EX_OK); 222 } 223 --nleft; 224 } 225 } 226 227 exit(EX_OK); 228 } 229