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117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
/*
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* Copyright (c) 1980, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)users.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmpx.h>
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typedef char namebuf[sizeof(((struct utmpx *)0)->ut_user) + 1];
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int scmp(const void *, const void *);
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static void usage(void);
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int
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main(int argc, char **argv)
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{
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namebuf *names = NULL;
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int ncnt = 0;
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int nmax = 0;
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int cnt;
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struct utmpx *ut;
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int ch;
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while ((ch = getopt(argc, argv, "")) != -1)
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switch(ch) {
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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setutxent();
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while ((ut = getutxent()) != NULL) {
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if (ut->ut_type != USER_PROCESS)
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continue;
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if (ncnt >= nmax) {
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nmax += 32;
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names = realloc(names, sizeof(*names) * nmax);
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if (!names) {
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errx(1, "realloc");
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/* NOTREACHED */
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}
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}
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(void)strlcpy(names[ncnt], ut->ut_user, sizeof(*names));
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++ncnt;
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}
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endutxent();
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if (ncnt > 0) {
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qsort(names, ncnt, sizeof(namebuf), scmp);
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(void)printf("%s", names[0]);
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for (cnt = 1; cnt < ncnt; ++cnt)
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if (strcmp(names[cnt], names[cnt - 1]) != 0)
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(void)printf(" %s", names[cnt]);
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(void)printf("\n");
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}
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: users\n");
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exit(1);
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}
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int
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scmp(const void *p, const void *q)
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{
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return (strcmp(p, q));
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}
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