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/cdefs.h> 35 #include <sys/types.h> 36 #include <sys/event.h> 37 #include <sys/time.h> 38 #include <sys/wait.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <signal.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 53 fprintf(stderr, "usage: pwait [-t timeout] [-ov] pid ...\n"); 54 exit(EX_USAGE); 55 } 56 57 /* 58 * pwait - wait for processes to terminate 59 */ 60 int 61 main(int argc, char *argv[]) 62 { 63 struct itimerval itv; 64 struct kevent *e; 65 int oflag, tflag, verbose; 66 int i, kq, n, nleft, opt, status; 67 long pid; 68 char *end, *s; 69 double timeout; 70 71 oflag = 0; 72 tflag = 0; 73 verbose = 0; 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 = 1; 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 case 's': 91 break; 92 case 'h': 93 timeout *= 60; 94 /* FALLTHROUGH */ 95 case 'm': 96 timeout *= 60; 97 break; 98 default: 99 errx(EX_DATAERR, "timeout unit"); 100 } 101 if (timeout > 100000000L) { 102 errx(EX_DATAERR, "timeout value"); 103 } 104 itv.it_value.tv_sec = (time_t)timeout; 105 timeout -= (time_t)timeout; 106 itv.it_value.tv_usec = 107 (suseconds_t)(timeout * 1000000UL); 108 break; 109 case 'v': 110 verbose = 1; 111 break; 112 default: 113 usage(); 114 /* NOTREACHED */ 115 } 116 } 117 118 argc -= optind; 119 argv += optind; 120 121 if (argc == 0) { 122 usage(); 123 } 124 125 kq = kqueue(); 126 if (kq == -1) { 127 err(EX_OSERR, "kqueue"); 128 } 129 130 e = malloc((argc + tflag) * sizeof(struct kevent)); 131 if (e == NULL) { 132 err(EX_OSERR, "malloc"); 133 } 134 nleft = 0; 135 for (n = 0; n < argc; n++) { 136 s = argv[n]; 137 /* Undocumented Solaris compat */ 138 if (!strncmp(s, "/proc/", 6)) { 139 s += 6; 140 } 141 errno = 0; 142 pid = strtol(s, &end, 10); 143 if (pid < 0 || *end != '\0' || errno != 0) { 144 warnx("%s: bad process id", s); 145 continue; 146 } 147 if (pid == getpid()) { 148 warnx("%s: skipping my own pid", s); 149 continue; 150 } 151 for (i = 0; i < nleft; i++) { 152 if (e[i].ident == (uintptr_t)pid) { 153 break; 154 } 155 } 156 if (i < nleft) { 157 /* Duplicate. */ 158 continue; 159 } 160 EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 161 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) { 162 warn("%ld", pid); 163 if (oflag) { 164 exit(EX_OK); 165 } 166 } else { 167 nleft++; 168 } 169 } 170 171 if (nleft > 0 && tflag) { 172 /* 173 * Explicitly detect SIGALRM so that an exit status of 124 174 * can be returned rather than 142. 175 */ 176 EV_SET(e + nleft, SIGALRM, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 177 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) { 178 err(EX_OSERR, "kevent"); 179 } 180 /* Ignore SIGALRM to not interrupt kevent(2). */ 181 signal(SIGALRM, SIG_IGN); 182 if (setitimer(ITIMER_REAL, &itv, NULL) == -1) { 183 err(EX_OSERR, "setitimer"); 184 } 185 } 186 while (nleft > 0) { 187 n = kevent(kq, NULL, 0, e, nleft + tflag, NULL); 188 if (n == -1) { 189 err(EX_OSERR, "kevent"); 190 } 191 for (i = 0; i < n; i++) { 192 if (e[i].filter == EVFILT_SIGNAL) { 193 if (verbose) { 194 printf("timeout\n"); 195 } 196 exit(124); 197 } 198 if (verbose) { 199 status = e[i].data; 200 if (WIFEXITED(status)) { 201 printf("%ld: exited with status %d.\n", 202 (long)e[i].ident, 203 WEXITSTATUS(status)); 204 } else if (WIFSIGNALED(status)) { 205 printf("%ld: killed by signal %d.\n", 206 (long)e[i].ident, 207 WTERMSIG(status)); 208 } else { 209 printf("%ld: terminated.\n", 210 (long)e[i].ident); 211 } 212 } 213 if (oflag) { 214 exit(EX_OK); 215 } 216 --nleft; 217 } 218 } 219 220 exit(EX_OK); 221 } 222