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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 [-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         int kq;
67         struct kevent *e;
68         int verbose = 0;
69         int opt, nleft, n, i, duplicate, status;
70         long pid;
71         char *s, *end;
72
73         while ((opt = getopt(argc, argv, "v")) != -1) {
74                 switch (opt) {
75                 case 'v':
76                         verbose = 1;
77                         break;
78                 default:
79                         usage();
80                         /* NOTREACHED */
81                 }
82         }
83
84         argc -= optind;
85         argv += optind;
86
87         if (argc == 0)
88                 usage();
89
90         kq = kqueue();
91         if (kq == -1)
92                 err(1, "kqueue");
93
94         e = malloc(argc * sizeof(struct kevent));
95         if (e == NULL)
96                 err(1, "malloc");
97         nleft = 0;
98         for (n = 0; n < argc; n++) {
99                 s = argv[n];
100                 if (!strncmp(s, "/proc/", 6)) /* Undocumented Solaris compat */
101                         s += 6;
102                 errno = 0;
103                 pid = strtol(s, &end, 10);
104                 if (pid < 0 || *end != '\0' || errno != 0) {
105                         warnx("%s: bad process id", s);
106                         continue;
107                 }
108                 duplicate = 0;
109                 for (i = 0; i < nleft; i++)
110                         if (e[i].ident == (uintptr_t)pid)
111                                 duplicate = 1;
112                 if (!duplicate) {
113                         EV_SET(e + nleft, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT,
114                             0, NULL);
115                         if (kevent(kq, e + nleft, 1, NULL, 0, NULL) == -1)
116                                 warn("%ld", pid);
117                         else
118                                 nleft++;
119                 }
120         }
121
122         while (nleft > 0) {
123                 n = kevent(kq, NULL, 0, e, nleft, NULL);
124                 if (n == -1)
125                         err(1, "kevent");
126                 if (verbose)
127                         for (i = 0; i < n; i++) {
128                                 status = e[i].data;
129                                 if (WIFEXITED(status))
130                                         printf("%ld: exited with status %d.\n",
131                                             (long)e[i].ident,
132                                             WEXITSTATUS(status));
133                                 else if (WIFSIGNALED(status))
134                                         printf("%ld: killed by signal %d.\n",
135                                             (long)e[i].ident,
136                                             WTERMSIG(status));
137                                 else
138                                         printf("%ld: terminated.\n",
139                                             (long)e[i].ident);
140                         }
141                 nleft -= n;
142         }
143
144         exit(EX_OK);
145 }