usr.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  * $FreeBSD: head/bin/pwait/pwait.c 245506 2013-01-16 18:15:25Z delphij $
  34  */
  35
  36 #include <sys/types.h>
  37 #include <sys/event.h>
  38 #include <sys/time.h>
  39 #include <sys/wait.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <signal.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <sysexits.h>
  49 #include <unistd.h>
  50
  51 static void
  52 usage(void)
  53 {
  54
  55         fprintf(stderr, "usage: pwait [-v] pid ...\n");
  56         exit(EX_USAGE);
  57 }
  58
  59 /*
  60  * pwait - wait for processes to terminate
  61  */
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         int kq;
  66         struct kevent *e;
  67         int verbose = 0;
  68         int opt, nleft, n, i, duplicate, status;
  69         long pid;
  70         char *s, *end;
  71
  72         while ((opt = getopt(argc, argv, "v")) != -1) {
  73                 switch (opt) {
  74                 case 'v':
  75                         verbose = 1;
  76                         break;
  77                 default:
  78                         usage();
  79                         /* NOTREACHED */
  80                 }
  81         }
  82
  83         argc -= optind;
  84         argv += optind;
  85
  86         if (argc == 0)
  87                 usage();
  88
  89         kq = kqueue();
  90         if (kq == -1)
  91                 err(1, "kqueue");
  92
  93         e = malloc(argc * sizeof(struct kevent));
  94         if (e == NULL)
  95                 err(1, "malloc");
  96         nleft = 0;
  97         for (n = 0; n < argc; n++) {
  98                 s = argv[n];
  99                 if (!strncmp(s, "/proc/", 6)) /* Undocumented Solaris compat */
 100                         s += 6;
 101                 errno = 0;
 102                 pid = strtol(s, &end, 10);
 103                 if (pid < 0 || *end != '\0' || errno != 0) {
 104                         warnx("%s: bad process id", s);
 105                         continue;
 106                 }
 107                 duplicate = 0;
 108                 for (i = 0; i < nleft; i++)
 109                         if (e[i].ident == (uintptr_t)pid)
 110                                 duplicate = 1;
 111                 if (!duplicate) {
 112                         EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT,
 113                             0, NULL);
 114                         if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
 115                                 warn("%ld", pid);
 116                         else
 117                                 nleft++;
 118                 }
 119         }
 120
 121         while (nleft > 0) {
 122                 n = kevent(kq, NULL, 0, e, nleft, NULL);
 123                 if (n == -1)
 124                         err(1, "kevent");
 125                 if (verbose)
 126                         for (i = 0; i < n; i++) {
 127                                 status = e[i].data;
 128                                 if (WIFEXITED(status))
 129                                         printf("%ld: exited with status %d.\n",
 130                                             (long)e[i].ident,
 131                                             WEXITSTATUS(status));
 132                                 else if (WIFSIGNALED(status))
 133                                         printf("%ld: killed by signal %d.\n",
 134                                             (long)e[i].ident,
 135                                             WTERMSIG(status));
 136                                 else
 137                                         printf("%ld: terminated.\n",
 138                                             (long)e[i].ident);
 139                         }
 140                 nleft -= n;
 141         }
 142
 143         exit(EX_OK);
 144 }