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