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 <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <sysexits.h> 46 #include <unistd.h> 47 48 static void 49 usage(void) 50 { 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 int oflag, tflag, verbose; 65 int i, kq, n, nleft, opt, status; 66 long pid; 67 char *end, *s; 68 double timeout; 69 70 oflag = 0; 71 tflag = 0; 72 verbose = 0; 73 memset(&itv, 0, sizeof(itv)); 74 75 while ((opt = getopt(argc, argv, "ot:v")) != -1) { 76 switch (opt) { 77 case 'o': 78 oflag = 1; 79 break; 80 case 't': 81 tflag = 1; 82 errno = 0; 83 timeout = strtod(optarg, &end); 84 if (end == optarg || errno == ERANGE || timeout < 0) { 85 errx(EX_DATAERR, "timeout value"); 86 } 87 switch(*end) { 88 case 0: 89 case 's': 90 break; 91 case 'h': 92 timeout *= 60; 93 /* FALLTHROUGH */ 94 case 'm': 95 timeout *= 60; 96 break; 97 default: 98 errx(EX_DATAERR, "timeout unit"); 99 } 100 if (timeout > 100000000L) { 101 errx(EX_DATAERR, "timeout value"); 102 } 103 itv.it_value.tv_sec = (time_t)timeout; 104 timeout -= (time_t)timeout; 105 itv.it_value.tv_usec = 106 (suseconds_t)(timeout * 1000000UL); 107 break; 108 case 'v': 109 verbose = 1; 110 break; 111 default: 112 usage(); 113 /* NOTREACHED */ 114 } 115 } 116 117 argc -= optind; 118 argv += optind; 119 120 if (argc == 0) { 121 usage(); 122 } 123 124 kq = kqueue(); 125 if (kq == -1) { 126 err(EX_OSERR, "kqueue"); 127 } 128 129 e = malloc((argc + tflag) * sizeof(struct kevent)); 130 if (e == NULL) { 131 err(EX_OSERR, "malloc"); 132 } 133 nleft = 0; 134 for (n = 0; n < argc; n++) { 135 s = argv[n]; 136 /* Undocumented Solaris compat */ 137 if (!strncmp(s, "/proc/", 6)) { 138 s += 6; 139 } 140 errno = 0; 141 pid = strtol(s, &end, 10); 142 if (pid < 0 || *end != '\0' || errno != 0) { 143 warnx("%s: bad process id", s); 144 continue; 145 } 146 if (pid == getpid()) { 147 warnx("%s: skipping my own pid", s); 148 continue; 149 } 150 for (i = 0; i < nleft; i++) { 151 if (e[i].ident == (uintptr_t)pid) { 152 break; 153 } 154 } 155 if (i < nleft) { 156 /* Duplicate. */ 157 continue; 158 } 159 EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL); 160 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) { 161 warn("%ld", pid); 162 if (oflag) { 163 exit(EX_OK); 164 } 165 } else { 166 nleft++; 167 } 168 } 169 170 if (nleft > 0 && tflag) { 171 /* 172 * Explicitly detect SIGALRM so that an exit status of 124 173 * can be returned rather than 142. 174 */ 175 EV_SET(e + nleft, SIGALRM, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 176 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) { 177 err(EX_OSERR, "kevent"); 178 } 179 /* Ignore SIGALRM to not interrupt kevent(2). */ 180 signal(SIGALRM, SIG_IGN); 181 if (setitimer(ITIMER_REAL, &itv, NULL) == -1) { 182 err(EX_OSERR, "setitimer"); 183 } 184 } 185 while (nleft > 0) { 186 n = kevent(kq, NULL, 0, e, nleft + tflag, NULL); 187 if (n == -1) { 188 err(EX_OSERR, "kevent"); 189 } 190 for (i = 0; i < n; i++) { 191 if (e[i].filter == EVFILT_SIGNAL) { 192 if (verbose) { 193 printf("timeout\n"); 194 } 195 exit(124); 196 } 197 if (verbose) { 198 status = e[i].data; 199 if (WIFEXITED(status)) { 200 printf("%ld: exited with status %d.\n", 201 (long)e[i].ident, 202 WEXITSTATUS(status)); 203 } else if (WIFSIGNALED(status)) { 204 printf("%ld: killed by signal %d.\n", 205 (long)e[i].ident, 206 WTERMSIG(status)); 207 } else { 208 printf("%ld: terminated.\n", 209 (long)e[i].ident); 210 } 211 } 212 if (oflag) { 213 exit(EX_OK); 214 } 215 --nleft; 216 } 217 } 218 219 exit(EX_OK); 220 } 221