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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* 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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* Modified Sun Mar 12 10:39:22 1995, faith@cs.unc.edu for Linux
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/* 1999-02-22 Arkadiusz Mi�kiewicz <misiek@pld.ORG.PL>
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* - added Native Language Support
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* Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* - fixed strerr(errno) in gettext calls
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#include <sys/types.h>
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#include "pathnames.h"
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* Display the contents of a uio structure on a terminal. Used by wall(1),
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* syslogd(8), and talkd(8). Forks and finishes in child if write would block,
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* waiting up to tmout seconds. Returns pointer to error string on unexpected
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* error; string is not newline-terminated. Various "normal" errors are
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* ignored (exclusive-use, lack of permission, etc.).
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ttymsg(struct iovec *iov, size_t iovcnt, char *line, int tmout) {
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static char device[MAXNAMLEN];
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static char errbuf[MAXNAMLEN+1024];
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struct iovec localiov[6];
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int fd, forked = 0, errsv;
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if (iovcnt > sizeof(localiov) / sizeof(localiov[0]))
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return (_("too many iov's (change code in wall/ttymsg.c)"));
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/* The old code here rejected the line argument when it contained a '/',
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saying: "A slash may be an attempt to break security...".
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However, if a user can control the line argument here
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then he can make this routine write to /dev/hda or /dev/sda
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already. So, this test was worthless, and these days it is
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also wrong since people use /dev/pts/xxx. */
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if (strlen(line) + sizeof(_PATH_DEV) + 1 > sizeof(device)) {
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(void) sprintf(errbuf, _("excessively long line arg"));
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(void) sprintf(device, "%s%s", _PATH_DEV, line);
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* open will fail on slip lines or exclusive-use lines
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* if not running as root; not an error.
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if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
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if (errno == EBUSY || errno == EACCES)
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if (strlen(strerror(errno)) > 1000)
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(void) sprintf(errbuf, "%s: %s", device, strerror(errno));
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for (cnt = left = 0; cnt < iovcnt; ++cnt)
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left += iov[cnt].iov_len;
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wret = writev(fd, iov, iovcnt);
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if (wret >= (ssize_t) left)
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if (iov != localiov) {
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memmove(localiov, iov,
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iovcnt * sizeof(struct iovec));
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for (cnt = 0; wret >= (ssize_t) iov->iov_len; ++cnt) {
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wret -= iov->iov_len;
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iov->iov_base = (char *) iov->iov_base + wret;
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iov->iov_len -= wret;
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if (errno == EWOULDBLOCK) {
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if (strlen(strerror(errno)) > 1000)
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(void) sprintf(errbuf, _("cannot fork"));
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(void) sprintf(errbuf,
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_("fork: %s"), strerror(errsv));
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if (cpid) { /* parent */
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/* wait at most tmout seconds */
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(void) signal(SIGALRM, SIG_DFL);
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(void) signal(SIGTERM, SIG_DFL); /* XXX */
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sigemptyset(&sigmask);
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sigprocmask (SIG_SETMASK, &sigmask, NULL);
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(void) alarm((u_int)tmout);
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flags = fcntl(fd, F_GETFL);
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fcntl(flags, F_SETFL, (long) (flags & ~O_NONBLOCK));
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* We get ENODEV on a slip line if we're running as root,
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* and EIO if the line just went away.
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if (errno == ENODEV || errno == EIO)
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if (strlen(strerror(errno)) > 1000)
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(void) sprintf(errbuf, _("%s: BAD ERROR, message is "
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"far too long"), device);
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(void) sprintf(errbuf, "%s: %s", device,