bin/pwait/pwait.c

   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 }