1 files changed, 190 insertions, 0 deletions
diff --git a/term-utils/ttymsg.c b/term-utils/ttymsg.c
new file mode 100644
index 0000000..2aab69f
--- /dev/null
+++ b/term-utils/ttymsg.c
@@ -0,0 +1,190 @@
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Modified Sun Mar 12 10:39:22 1995, faith@cs.unc.edu for Linux
+ *
+ */
+
+ /* 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
+  * - added Native Language Support
+  * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+  * - fixed strerr(errno) in gettext calls
+  */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/uio.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <errno.h>
+#include <paths.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "nls.h"
+#include "closestream.h"
+#include "pathnames.h"
+#include "ttymsg.h"
+
+#define ERR_BUFLEN	(MAXNAMLEN + 1024)
+
+/*
+ * Display the contents of a uio structure on a terminal.  Used by wall(1),
+ * syslogd(8), and talkd(8).  Forks and finishes in child if write would block,
+ * waiting up to tmout seconds.  Returns pointer to error string on unexpected
+ * error; string is not newline-terminated.  Various "normal" errors are
+ * ignored (exclusive-use, lack of permission, etc.).
+ */
+char *
+ttymsg(struct iovec *iov, size_t iovcnt, char *line, int tmout) {
+	static char device[MAXNAMLEN];
+	static char errbuf[ERR_BUFLEN];
+	size_t cnt, left;
+	ssize_t wret;
+	struct iovec localiov[6];
+	int fd, forked = 0;
+	ssize_t	len = 0;
+
+	if (iovcnt > ARRAY_SIZE(localiov)) {
+		snprintf(errbuf, sizeof(errbuf), _("internal error: too many iov's"));
+		return errbuf;
+	}
+
+	/* The old code here rejected the line argument when it contained a '/',
+	   saying: "A slash may be an attempt to break security...".
+	   However, if a user can control the line argument here
+	   then he can make this routine write to /dev/hda or /dev/sda
+	   already. So, this test was worthless, and these days it is
+	   also wrong since people use /dev/pts/xxx. */
+
+	len = snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line);
+	if (len < 0 || (size_t)len >= sizeof(device)) {
+		snprintf(errbuf, sizeof(errbuf), _("excessively long line arg"));
+		return errbuf;
+	}
+
+	/*
+	 * open will fail on slip lines or exclusive-use lines
+	 * if not running as root; not an error.
+	 */
+	if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
+		if (errno == EBUSY || errno == EACCES)
+			return NULL;
+
+		len = snprintf(errbuf, sizeof(errbuf), "%s: %m", device);
+		if (len < 0 || (size_t)len >= sizeof(errbuf))
+			snprintf(errbuf, sizeof(errbuf), _("open failed"));
+		return errbuf;
+	}
+
+	for (cnt = left = 0; cnt < iovcnt; ++cnt)
+		left += iov[cnt].iov_len;
+
+	for (;;) {
+		wret = writev(fd, iov, iovcnt);
+		if (wret >= (ssize_t) left)
+			break;
+		if (wret >= 0) {
+			left -= wret;
+			if (iov != localiov) {
+				memmove(localiov, iov,
+				    iovcnt * sizeof(struct iovec));
+				iov = localiov;
+			}
+			for (cnt = 0; wret >= (ssize_t) iov->iov_len; ++cnt) {
+				wret -= iov->iov_len;
+				++iov;
+				--iovcnt;
+			}
+			if (wret) {
+				iov->iov_base = (char *) iov->iov_base + wret;
+				iov->iov_len -= wret;
+			}
+			continue;
+		}
+		if (errno == EWOULDBLOCK) {
+			int cpid, flags;
+			sigset_t sigmask;
+
+			if (forked) {
+				close(fd);
+				_exit(EXIT_FAILURE);
+			}
+			cpid = fork();
+			if (cpid < 0) {
+				len = snprintf(errbuf, sizeof(errbuf), _("fork: %m"));
+				if (len < 0 || (size_t)len >= sizeof(errbuf))
+					snprintf(errbuf, sizeof(errbuf), _("cannot fork"));
+				close(fd);
+				return errbuf;
+			}
+			if (cpid) {	/* parent */
+				close(fd);
+				return NULL;
+			}
+			forked++;
+			/* wait at most tmout seconds */
+			signal(SIGALRM, SIG_DFL);
+			signal(SIGTERM, SIG_DFL); /* XXX */
+			sigemptyset(&sigmask);
+			sigprocmask (SIG_SETMASK, &sigmask, NULL);
+			alarm((u_int)tmout);
+			flags = fcntl(fd, F_GETFL);
+			fcntl(flags, F_SETFL, (long) (flags & ~O_NONBLOCK));
+			continue;
+		}
+		/*
+		 * We get ENODEV on a slip line if we're running as root,
+		 * and EIO if the line just went away.
+		 */
+		if (errno == ENODEV || errno == EIO)
+			break;
+		if (close_fd(fd) != 0)
+			warn(_("write failed: %s"), device);
+		if (forked)
+			_exit(EXIT_FAILURE);
+
+		len = snprintf(errbuf, sizeof(errbuf), "%s: %m", device);
+		if (len < 0 || (size_t)len >= sizeof(errbuf))
+			snprintf(errbuf, sizeof(errbuf),
+					_("%s: BAD ERROR, message is "
+					  "far too long"), device);
+		return errbuf;
+	}
+
+	if (forked)
+		_exit(EXIT_SUCCESS);
+	return NULL;
+}