bsd-misc.c revision 137015 
1
2/*
3 * Copyright (c) 1999-2004 Damien Miller <djm@mindrot.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include "includes.h"
19#include "xmalloc.h"
20
21RCSID("$Id: bsd-misc.c,v 1.25 2004/08/15 08:41:00 djm Exp $");
22
23#ifndef HAVE___PROGNAME
24char *__progname;
25#endif
26
27/*
28 * NB. duplicate __progname in case it is an alias for argv[0]
29 * Otherwise it may get clobbered by setproctitle()
30 */
31char *ssh_get_progname(char *argv0)
32{
33#ifdef HAVE___PROGNAME
34	extern char *__progname;
35
36	return xstrdup(__progname);
37#else
38	char *p;
39
40	if (argv0 == NULL)
41		return ("unknown");	/* XXX */
42	p = strrchr(argv0, '/');
43	if (p == NULL)
44		p = argv0;
45	else
46		p++;
47
48	return (xstrdup(p));
49#endif
50}
51
52#ifndef HAVE_SETLOGIN
53int setlogin(const char *name)
54{
55	return (0);
56}
57#endif /* !HAVE_SETLOGIN */
58
59#ifndef HAVE_INNETGR
60int innetgr(const char *netgroup, const char *host,
61            const char *user, const char *domain)
62{
63	return (0);
64}
65#endif /* HAVE_INNETGR */
66
67#if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
68int seteuid(uid_t euid)
69{
70	return (setreuid(-1, euid));
71}
72#endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */
73
74#if !defined(HAVE_SETEGID) && defined(HAVE_SETRESGID)
75int setegid(uid_t egid)
76{
77	return(setresgid(-1, egid, -1));
78}
79#endif /* !defined(HAVE_SETEGID) && defined(HAVE_SETRESGID) */
80
81#if !defined(HAVE_STRERROR) && defined(HAVE_SYS_ERRLIST) && defined(HAVE_SYS_NERR)
82const char *strerror(int e)
83{
84	extern int sys_nerr;
85	extern char *sys_errlist[];
86
87	if ((e >= 0) && (e < sys_nerr))
88		return (sys_errlist[e]);
89
90	return ("unlisted error");
91}
92#endif
93
94#ifndef HAVE_UTIMES
95int utimes(char *filename, struct timeval *tvp)
96{
97	struct utimbuf ub;
98
99	ub.actime = tvp[0].tv_sec;
100	ub.modtime = tvp[1].tv_sec;
101
102	return (utime(filename, &ub));
103}
104#endif
105
106#ifndef HAVE_TRUNCATE
107int truncate(const char *path, off_t length)
108{
109	int fd, ret, saverrno;
110
111	fd = open(path, O_WRONLY);
112	if (fd < 0)
113		return (-1);
114
115	ret = ftruncate(fd, length);
116	saverrno = errno;
117	close(fd);
118	if (ret == -1)
119		errno = saverrno;
120
121	return(ret);
122}
123#endif /* HAVE_TRUNCATE */
124
125#if !defined(HAVE_SETGROUPS) && defined(SETGROUPS_NOOP)
126/*
127 * Cygwin setgroups should be a noop.
128 */
129int
130setgroups(size_t size, const gid_t *list)
131{
132	return (0);
133}
134#endif
135
136#if !defined(HAVE_NANOSLEEP) && !defined(HAVE_NSLEEP)
137int nanosleep(const struct timespec *req, struct timespec *rem)
138{
139	int rc, saverrno;
140	extern int errno;
141	struct timeval tstart, tstop, tremain, time2wait;
142
143	TIMESPEC_TO_TIMEVAL(&time2wait, req)
144	(void) gettimeofday(&tstart, NULL);
145	rc = select(0, NULL, NULL, NULL, &time2wait);
146	if (rc == -1) {
147		saverrno = errno;
148		(void) gettimeofday (&tstop, NULL);
149		errno = saverrno;
150		tremain.tv_sec = time2wait.tv_sec -
151			(tstop.tv_sec - tstart.tv_sec);
152		tremain.tv_usec = time2wait.tv_usec -
153			(tstop.tv_usec - tstart.tv_usec);
154		tremain.tv_sec += tremain.tv_usec / 1000000L;
155		tremain.tv_usec %= 1000000L;
156	} else {
157		tremain.tv_sec = 0;
158		tremain.tv_usec = 0;
159	}
160	TIMEVAL_TO_TIMESPEC(&tremain, rem)
161
162	return(rc);
163}
164#endif
165
166#ifndef HAVE_TCGETPGRP
167pid_t
168tcgetpgrp(int fd)
169{
170	int ctty_pgrp;
171
172	if (ioctl(fd, TIOCGPGRP, &ctty_pgrp) == -1)
173		return(-1);
174	else
175		return(ctty_pgrp);
176}
177#endif /* HAVE_TCGETPGRP */
178
179#ifndef HAVE_TCSENDBREAK
180int
181tcsendbreak(int fd, int duration)
182{
183# if defined(TIOCSBRK) && defined(TIOCCBRK)
184	struct timeval sleepytime;
185
186	sleepytime.tv_sec = 0;
187	sleepytime.tv_usec = 400000;
188	if (ioctl(fd, TIOCSBRK, 0) == -1)
189		return (-1);
190	(void)select(0, 0, 0, 0, &sleepytime);
191	if (ioctl(fd, TIOCCBRK, 0) == -1)
192		return (-1);
193	return (0);
194# else
195	return -1;
196# endif
197}
198#endif /* HAVE_TCSENDBREAK */
199
200mysig_t
201mysignal(int sig, mysig_t act)
202{
203#ifdef HAVE_SIGACTION
204	struct sigaction sa, osa;
205
206	if (sigaction(sig, NULL, &osa) == -1)
207		return (mysig_t) -1;
208	if (osa.sa_handler != act) {
209		memset(&sa, 0, sizeof(sa));
210		sigemptyset(&sa.sa_mask);
211		sa.sa_flags = 0;
212#ifdef SA_INTERRUPT
213		if (sig == SIGALRM)
214			sa.sa_flags |= SA_INTERRUPT;
215#endif
216		sa.sa_handler = act;
217		if (sigaction(sig, &sa, NULL) == -1)
218			return (mysig_t) -1;
219	}
220	return (osa.sa_handler);
221#else
222	#undef signal
223	return (signal(sig, act));
224#endif
225}
226