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/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/types.h>
  38 #include <sys/event.h>
  39 #include <sys/time.h>
  40 #include <sys/wait.h>
  41
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <signal.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <sysexits.h>
  50 #include <unistd.h>
  51
  52 static void
  53 usage(void)
  54 {
  55
  56         errx(EX_USAGE, "usage: pwait [-t timeout] [-v] pid ...");
  57 }
  58
  59 /*
  60  * pwait - wait for processes to terminate
  61  */
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         struct itimerval itv;
  66         int kq;
  67         struct kevent *e;
  68         int tflag, verbose;
  69         int opt, nleft, n, i, duplicate, status;
  70         long pid;
  71         char *s, *end;
  72         double timeout;
  73
  74         tflag = verbose = 0;
  75         memset(&itv, 0, sizeof(itv));
  76         while ((opt = getopt(argc, argv, "t:v")) != -1) {
  77                 switch (opt) {
  78                 case 't':
  79                         tflag = 1;
  80                         errno = 0;
  81                         timeout = strtod(optarg, &end);
  82                         if (end == optarg || errno == ERANGE ||
  83                             timeout < 0)
  84                                 errx(EX_DATAERR, "timeout value");
  85                         switch(*end) {
  86                         case 0:
  87                         case 's':
  88                                 break;
  89                         case 'h':
  90                                 timeout *= 60;
  91                                 /* FALLTHROUGH */
  92                         case 'm':
  93                                 timeout *= 60;
  94                                 break;
  95                         default:
  96                                 errx(EX_DATAERR, "timeout unit");
  97                         }
  98                         if (timeout > 100000000L)
  99                                 errx(EX_DATAERR, "timeout value");
 100                         itv.it_value.tv_sec = (time_t)timeout;
 101                         timeout -= (time_t)timeout;
 102                         itv.it_value.tv_usec =
 103                             (suseconds_t)(timeout * 1000000UL);
 104                         break;
 105                 case 'v':
 106                         verbose = 1;
 107                         break;
 108                 default:
 109                         usage();
 110                         /* NOTREACHED */
 111                 }
 112         }
 113
 114         argc -= optind;
 115         argv += optind;
 116
 117         if (argc == 0)
 118                 usage();
 119
 120         kq = kqueue();
 121         if (kq == -1)
 122                 err(EX_OSERR, "kqueue");
 123
 124         e = malloc((argc + tflag) * sizeof(struct kevent));
 125         if (e == NULL)
 126                 err(EX_OSERR, "malloc");
 127         nleft = 0;
 128         for (n = 0; n < argc; n++) {
 129                 s = argv[n];
 130                 if (!strncmp(s, "/proc/", 6)) /* Undocumented Solaris compat */
 131                         s += 6;
 132                 errno = 0;
 133                 pid = strtol(s, &end, 10);
 134                 if (pid < 0 || *end != '\0' || errno != 0) {
 135                         warnx("%s: bad process id", s);
 136                         continue;
 137                 }
 138                 duplicate = 0;
 139                 for (i = 0; i < nleft; i++)
 140                         if (e[i].ident == (uintptr_t)pid)
 141                                 duplicate = 1;
 142                 if (!duplicate) {
 143                         EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT,
 144                             0, NULL);
 145                         if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
 146                                 warn("%ld", pid);
 147                         else
 148                                 nleft++;
 149                 }
 150         }
 151
 152         if (tflag) {
 153                 /*
 154                  * Explicitly detect SIGALRM so that an exit status of 124
 155                  * can be returned rather than 142.
 156                  */
 157                 EV_SET(e + nleft, SIGALRM, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
 158                 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
 159                         err(EX_OSERR, "kevent");
 160                 /* Ignore SIGALRM to not interrupt kevent(2). */
 161                 signal(SIGALRM, SIG_IGN);
 162                 if (setitimer(ITIMER_REAL, &itv, NULL) == -1)
 163                         err(EX_OSERR, "setitimer");
 164         }
 165         while (nleft > 0) {
 166                 n = kevent(kq, NULL, 0, e, nleft + tflag, NULL);
 167                 if (n == -1)
 168                         err(EX_OSERR, "kevent");
 169                 for (i = 0; i < n; i++) {
 170                         if (e[i].filter == EVFILT_SIGNAL) {
 171                                 if (verbose)
 172                                         printf("timeout\n");
 173                                 exit(124);
 174                         }
 175                         if (verbose) {
 176                                 status = e[i].data;
 177                                 if (WIFEXITED(status))
 178                                         printf("%ld: exited with status %d.\n",
 179                                             (long)e[i].ident,
 180                                             WEXITSTATUS(status));
 181                                 else if (WIFSIGNALED(status))
 182                                         printf("%ld: killed by signal %d.\n",
 183                                             (long)e[i].ident,
 184                                             WTERMSIG(status));
 185                                 else
 186                                         printf("%ld: terminated.\n",
 187                                             (long)e[i].ident);
 188                         }
 189                         --nleft;
 190                 }
 191         }
 192
 193         exit(EX_OK);
 194 }