2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Modified Sun Mar 12 10:39:22 1995, faith@cs.unc.edu for Linux
37 /* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
38 * - added Native Language Support
39 * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
40 * - fixed strerr(errno) in gettext calls
43 #include <sys/types.h>
56 #include "pathnames.h"
60 * Display the contents of a uio structure on a terminal. Used by wall(1),
61 * syslogd(8), and talkd(8). Forks and finishes in child if write would block,
62 * waiting up to tmout seconds. Returns pointer to error string on unexpected
63 * error; string is not newline-terminated. Various "normal" errors are
64 * ignored (exclusive-use, lack of permission, etc.).
67 ttymsg(struct iovec *iov, int iovcnt, char *line, int tmout) {
68 static char device[MAXNAMLEN];
69 static char errbuf[MAXNAMLEN+1024];
70 register int cnt, fd, left, wret;
71 struct iovec localiov[6];
72 int forked = 0, errsv;
74 if (iovcnt > sizeof(localiov) / sizeof(localiov[0]))
75 return (_("too many iov's (change code in wall/ttymsg.c)"));
77 /* The old code here rejected the line argument when it contained a '/',
78 saying: "A slash may be an attempt to break security...".
79 However, if a user can control the line argument here
80 then he can make this routine write to /dev/hda or /dev/sda
81 already. So, this test was worthless, and these days it is
82 also wrong since people use /dev/pts/xxx. */
84 if (strlen(line) + sizeof(_PATH_DEV) + 1 > sizeof(device)) {
85 (void) sprintf(errbuf, _("excessively long line arg"));
88 (void) sprintf(device, "%s%s", _PATH_DEV, line);
91 * open will fail on slip lines or exclusive-use lines
92 * if not running as root; not an error.
94 if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
95 if (errno == EBUSY || errno == EACCES)
97 if (strlen(strerror(errno)) > 1000)
99 (void) sprintf(errbuf, "%s: %s", device, strerror(errno));
104 for (cnt = left = 0; cnt < iovcnt; ++cnt)
105 left += iov[cnt].iov_len;
108 wret = writev(fd, iov, iovcnt);
113 if (iov != localiov) {
114 memmove(localiov, iov,
115 iovcnt * sizeof(struct iovec));
118 for (cnt = 0; wret >= iov->iov_len; ++cnt) {
119 wret -= iov->iov_len;
124 iov->iov_base += wret;
125 iov->iov_len -= wret;
129 if (errno == EWOULDBLOCK) {
139 if (strlen(strerror(errno)) > 1000)
140 (void) sprintf(errbuf, _("cannot fork"));
143 (void) sprintf(errbuf,
144 _("fork: %s"), strerror(errsv));
149 if (cpid) { /* parent */
154 /* wait at most tmout seconds */
155 (void) signal(SIGALRM, SIG_DFL);
156 (void) signal(SIGTERM, SIG_DFL); /* XXX */
157 sigemptyset(&sigmask);
158 sigprocmask (SIG_SETMASK, &sigmask, NULL);
159 (void) alarm((u_int)tmout);
160 flags = fcntl(fd, F_GETFL);
161 fcntl(flags, F_SETFL, (long) (flags & ~O_NONBLOCK));
165 * We get ENODEV on a slip line if we're running as root,
166 * and EIO if the line just went away.
168 if (errno == ENODEV || errno == EIO)
173 if (strlen(strerror(errno)) > 1000)
174 (void) sprintf(errbuf, _("%s: BAD ERROR"), device);
177 (void) sprintf(errbuf, "%s: %s", device,