1 /*
2 * Copyright (c) 1980, 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1980, 1987, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
34 #endif /* not lint */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)users.c 8.1 (Berkeley) 6/6/93";
39 #endif
40 static const char rcsid[] =
41 "$FreeBSD$";
42 #endif /* not lint */
43
44 #include <sys/param.h>
45 #include <sys/types.h>
46 #include <err.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
51 #include <utmpx.h>
52
53 typedef char namebuf[sizeof(((struct utmpx *)0)->ut_user) + 1];
54
55 int scmp(const void *, const void *);
56 static void usage(void);
57
58 int
main(int argc,char ** argv)59 main(int argc, char **argv)
60 {
61 namebuf *names = NULL;
62 int ncnt = 0;
63 int nmax = 0;
64 int cnt;
65 struct utmpx *ut;
66 int ch;
67
68 while ((ch = getopt(argc, argv, "")) != -1)
69 switch(ch) {
70 case '?':
71 default:
72 usage();
73 }
74 argc -= optind;
75 argv += optind;
76
77 setutxent();
78 while ((ut = getutxent()) != NULL) {
79 if (ut->ut_type != USER_PROCESS)
80 continue;
81 if (ncnt >= nmax) {
82 nmax += 32;
83 names = realloc(names, sizeof(*names) * nmax);
84 if (!names) {
85 errx(1, "realloc");
86 /* NOTREACHED */
87 }
88 }
89 (void)strlcpy(names[ncnt], ut->ut_user, sizeof(*names));
90 ++ncnt;
91 }
92 endutxent();
93 if (ncnt > 0) {
94 qsort(names, ncnt, sizeof(namebuf), scmp);
95 (void)printf("%s", names[0]);
96 for (cnt = 1; cnt < ncnt; ++cnt)
97 if (strcmp(names[cnt], names[cnt - 1]) != 0)
98 (void)printf(" %s", names[cnt]);
99 (void)printf("\n");
100 }
101 exit(0);
102 }
103
104 static void
usage(void)105 usage(void)
106 {
107 (void)fprintf(stderr, "usage: users\n");
108 exit(1);
109 }
110
111 int
scmp(const void * p,const void * q)112 scmp(const void *p, const void *q)
113 {
114
115 return (strcmp(p, q));
116 }
117