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 #include <sys/types.h>
  36 #include <sys/event.h>
  37 #include <sys/time.h>
  38 #include <sys/wait.h>
  39
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <signal.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <sysexits.h>
  47 #include <unistd.h>
  48
  49 static void
  50 usage(void)
  51 {
  52
  53         fprintf(stderr, "usage: pwait [-t timeout] [-ov] pid ...\n");
  54         exit(EX_USAGE);
  55 }
  56
  57 /*
  58  * pwait - wait for processes to terminate
  59  */
  60 int
  61 main(int argc, char *argv[])
  62 {
  63         struct itimerval itv;
  64         struct kevent *e;
  65         int oflag, tflag, verbose;
  66         int i, kq, n, nleft, opt, status;
  67         long pid;
  68         char *end, *s;
  69         double timeout;
  70
  71         oflag = 0;
  72         tflag = 0;
  73         verbose = 0;
  74         memset(&itv, 0, sizeof(itv));
  75
  76         while ((opt = getopt(argc, argv, "ot:v")) != -1) {
  77                 switch (opt) {
  78                 case 'o':
  79                         oflag = 1;
  80                         break;
  81                 case 't':
  82                         tflag = 1;
  83                         errno = 0;
  84                         timeout = strtod(optarg, &end);
  85                         if (end == optarg || errno == ERANGE || timeout < 0) {
  86                                 errx(EX_DATAERR, "timeout value");
  87                         }
  88                         switch(*end) {
  89                         case 0:
  90                         case 's':
  91                                 break;
  92                         case 'h':
  93                                 timeout *= 60;
  94                                 /* FALLTHROUGH */
  95                         case 'm':
  96                                 timeout *= 60;
  97                                 break;
  98                         default:
  99                                 errx(EX_DATAERR, "timeout unit");
 100                         }
 101                         if (timeout > 100000000L) {
 102                                 errx(EX_DATAERR, "timeout value");
 103                         }
 104                         itv.it_value.tv_sec = (time_t)timeout;
 105                         timeout -= (time_t)timeout;
 106                         itv.it_value.tv_usec =
 107                             (suseconds_t)(timeout * 1000000UL);
 108                         break;
 109                 case 'v':
 110                         verbose = 1;
 111                         break;
 112                 default:
 113                         usage();
 114                         /* NOTREACHED */
 115                 }
 116         }
 117
 118         argc -= optind;
 119         argv += optind;
 120
 121         if (argc == 0) {
 122                 usage();
 123         }
 124
 125         kq = kqueue();
 126         if (kq == -1) {
 127                 err(EX_OSERR, "kqueue");
 128         }
 129
 130         e = malloc((argc + tflag) * sizeof(struct kevent));
 131         if (e == NULL) {
 132                 err(EX_OSERR, "malloc");
 133         }
 134         nleft = 0;
 135         for (n = 0; n < argc; n++) {
 136                 s = argv[n];
 137                 /* Undocumented Solaris compat */
 138                 if (!strncmp(s, "/proc/", 6)) {
 139                         s += 6;
 140                 }
 141                 errno = 0;
 142                 pid = strtol(s, &end, 10);
 143                 if (pid < 0 || *end != '\0' || errno != 0) {
 144                         warnx("%s: bad process id", s);
 145                         continue;
 146                 }
 147                 if (pid == getpid()) {
 148                         warnx("%s: skipping my own pid", s);
 149                         continue;
 150                 }
 151                 for (i = 0; i < nleft; i++) {
 152                         if (e[i].ident == (uintptr_t)pid) {
 153                                 break;
 154                         }
 155                 }
 156                 if (i < nleft) {
 157                         /* Duplicate. */
 158                         continue;
 159                 }
 160                 EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
 161                 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) {
 162                         warn("%ld", pid);
 163                         if (oflag) {
 164                                 exit(EX_OK);
 165                         }
 166                 } else {
 167                         nleft++;
 168                 }
 169         }
 170
 171         if (nleft > 0 && tflag) {
 172                 /*
 173                  * Explicitly detect SIGALRM so that an exit status of 124
 174                  * can be returned rather than 142.
 175                  */
 176                 EV_SET(e + nleft, SIGALRM, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
 177                 if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1) {
 178                         err(EX_OSERR, "kevent");
 179                 }
 180                 /* Ignore SIGALRM to not interrupt kevent(2). */
 181                 signal(SIGALRM, SIG_IGN);
 182                 if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
 183                         err(EX_OSERR, "setitimer");
 184                 }
 185         }
 186         while (nleft > 0) {
 187                 n = kevent(kq, NULL, 0, e, nleft + tflag, NULL);
 188                 if (n == -1) {
 189                         err(EX_OSERR, "kevent");
 190                 }
 191                 for (i = 0; i < n; i++) {
 192                         if (e[i].filter == EVFILT_SIGNAL) {
 193                                 if (verbose) {
 194                                         printf("timeout\n");
 195                                 }
 196                                 exit(124);
 197                         }
 198                         if (verbose) {
 199                                 status = e[i].data;
 200                                 if (WIFEXITED(status)) {
 201                                         printf("%ld: exited with status %d.\n",
 202                                             (long)e[i].ident,
 203                                             WEXITSTATUS(status));
 204                                 } else if (WIFSIGNALED(status)) {
 205                                         printf("%ld: killed by signal %d.\n",
 206                                             (long)e[i].ident,
 207                                             WTERMSIG(status));
 208                                 } else {
 209                                         printf("%ld: terminated.\n",
 210                                             (long)e[i].ident);
 211                                 }
 212                         }
 213                         if (oflag) {
 214                                 exit(EX_OK);
 215                         }
 216                         --nleft;
 217                 }
 218         }
 219
 220         exit(EX_OK);
 221 }