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         fprintf(stderr, "usage: pwait [-t timeout] [-v] pid ...\n");
  57         exit(EX_USAGE);
  58 }
  59
  60 /*
  61  * pwait - wait for processes to terminate
  62  */
  63 int
  64 main(int argc, char *argv[])
  65 {
  66         struct itimerval itv;
  67         int kq;
  68         struct kevent *e;
  69         int tflag, verbose;
  70         int opt, nleft, n, i, duplicate, status;
  71         long pid;
  72         char *s, *end;
  73         double timeout;
  74
  75         tflag = verbose = 0;
  76         memset(&itv, 0, sizeof(itv));
  77         while ((opt = getopt(argc, argv, "t:v")) != -1) {
  78                 switch (opt) {
  79                 case 't':
  80                         tflag = 1;
  81                         errno = 0;
  82                         timeout = strtod(optarg, &end);
  83                         if (end == optarg || errno == ERANGE ||
  84                             timeout < 0)
  85                                 errx(EX_DATAERR, "timeout value");
  86                         switch(*end) {
  87                         case 0:
  88                         case 's':
  89                                 break;
  90                         case 'h':
  91                                 timeout *= 60;
  92                                 /* FALLTHROUGH */
  93                         case 'm':
  94                                 timeout *= 60;
  95                                 break;
  96                         default:
  97                                 errx(EX_DATAERR, "timeout unit");
  98                         }
  99                         if (timeout > 100000000L)
 100                                 errx(EX_DATAERR, "timeout value");
 101                         itv.it_value.tv_sec = (time_t)timeout;
 102                         timeout -= (time_t)timeout;
 103                         itv.it_value.tv_usec =
 104                             (suseconds_t)(timeout * 1000000UL);
 105                         break;
 106                 case 'v':
 107                         verbose = 1;
 108                         break;
 109                 default:
 110                         usage();
 111                         /* NOTREACHED */
 112                 }
 113         }
 114
 115         argc -= optind;
 116         argv += optind;
 117
 118         if (argc == 0)
 119                 usage();
 120
 121         kq = kqueue();
 122         if (kq == -1)
 123                 err(1, "kqueue");
 124
 125         e = malloc((argc + tflag) * sizeof(struct kevent));
 126         if (e == NULL)
 127                 err(1, "malloc");
 128         nleft = 0;
 129         for (n = 0; n < argc; n++) {
 130                 s = argv[n];
 131                 if (!strncmp(s, "/proc/", 6)) /* Undocumented Solaris compat */
 132                         s += 6;
 133                 errno = 0;
 134                 pid = strtol(s, &end, 10);
 135                 if (pid < 0 || *end != '\0' || errno != 0) {
 136                         warnx("%s: bad process id", s);
 137                         continue;
 138                 }
 139                 duplicate = 0;
 140                 for (i = 0; i < nleft; i++)
 141                         if (e[i].ident == (uintptr_t)pid)
 142                                 duplicate = 1;
 143                 if (!duplicate) {
 144                         EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT,
 145                             0, NULL);
 146                         if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
 147                                 warn("%ld", pid);
 148                         else
 149                                 nleft++;
 150                 }
 151         }
 152
 153         if (tflag) {
 154                 /*
 155                  * Explicitly detect SIGALRM so that an exit status of 124
 156                  * can be returned rather than 142.
 157                  */
 158                 EV_SET(e + nleft, SIGALRM, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
 159                 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
 160                         err(EX_OSERR, "kevent");
 161                 /* Ignore SIGALRM to not interrupt kevent(2). */
 162                 signal(SIGALRM, SIG_IGN);
 163                 if (setitimer(ITIMER_REAL, &itv, NULL) == -1)
 164                         err(EX_OSERR, "setitimer");
 165         }
 166         while (nleft > 0) {
 167                 n = kevent(kq, NULL, 0, e, nleft + tflag, NULL);
 168                 if (n == -1)
 169                         err(1, "kevent");
 170                 for (i = 0; i < n; i++) {
 171                         if (e[i].filter == EVFILT_SIGNAL) {
 172                                 if (verbose)
 173                                         printf("timeout\n");
 174                                 return (124);
 175                         }
 176                         if (verbose) {
 177                                 status = e[i].data;
 178                                 if (WIFEXITED(status))
 179                                         printf("%ld: exited with status %d.\n",
 180                                             (long)e[i].ident,
 181                                             WEXITSTATUS(status));
 182                                 else if (WIFSIGNALED(status))
 183                                         printf("%ld: killed by signal %d.\n",
 184                                             (long)e[i].ident,
 185                                             WTERMSIG(status));
 186                                 else
 187                                         printf("%ld: terminated.\n",
 188                                             (long)e[i].ident);
 189                         }
 190                         --nleft;
 191                 }
 192         }
 193
 194         exit(EX_OK);
 195 }