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
34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static const char sccsid[] = "@(#)ttymsg.c 8.2 (Berkeley) 11/16/93";
42 #include <sys/types.h>
57 * Display the contents of a uio structure on a terminal. Used by wall(1),
58 * syslogd(8), and talkd(8). Forks and finishes in child if write would block,
59 * waiting up to tmout seconds. Returns pointer to error string on unexpected
60 * error; string is not newline-terminated. Various "normal" errors are
61 * ignored (exclusive-use, lack of permission, etc.).
64 ttymsg(struct iovec *iov, int iovcnt, const char *line, int tmout)
66 struct iovec localiov[7];
69 static char device[MAXNAMLEN] = _PATH_DEV;
70 static char errbuf[1024];
74 if (iovcnt > (int)(sizeof(localiov) / sizeof(localiov[0])))
75 return ("too many iov's (change code in wall/ttymsg.c)");
77 strlcpy(device + sizeof(_PATH_DEV) - 1, line, sizeof(device));
78 if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
79 /* A slash is an attempt to break security... */
80 (void) snprintf(errbuf, sizeof(errbuf),
81 "Too many '/' in \"%s\"", device);
86 * open will fail on slip lines or exclusive-use lines
87 * if not running as root; not an error.
89 if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
90 if (errno == EBUSY || errno == EACCES)
92 (void) snprintf(errbuf, sizeof(errbuf), "%s: %s", device,
97 for (cnt = 0, left = 0; cnt < iovcnt; ++cnt)
98 left += iov[cnt].iov_len;
101 wret = writev(fd, iov, iovcnt);
106 if (iov != localiov) {
108 iovcnt * sizeof(struct iovec));
111 for (cnt = 0; (size_t)wret >= iov->iov_len; ++cnt) {
112 wret -= iov->iov_len;
117 iov->iov_base += wret;
118 iov->iov_len -= wret;
122 if (errno == EWOULDBLOCK) {
131 (void) snprintf(errbuf, sizeof(errbuf),
132 "fork: %s", strerror(errno));
136 if (cpid) { /* parent */
141 /* wait at most tmout seconds */
142 (void) signal(SIGALRM, SIG_DFL);
143 (void) signal(SIGTERM, SIG_DFL); /* XXX */
144 (void) sigsetmask(0);
145 (void) alarm((u_int)tmout);
146 (void) fcntl(fd, F_SETFL, 0); /* clear O_NONBLOCK */
150 * We get ENODEV on a slip line if we're running as root,
151 * and EIO if the line just went away.
153 if (errno == ENODEV || errno == EIO)
158 (void) snprintf(errbuf, sizeof(errbuf),
159 "%s: %s", device, strerror(errno));