. add bsd-style MLINKS to minix man set, restoring aliases (e.g. man add64 -> int64) . update daily cron script to run makewhatis and restore makewhatis in man Makefile (makedb), restores functionality of man -k . netbsd imports of man, mdocml, makewhatis, libutil, apropos . update man.conf with manpage locations, restoring man [-s] <section> . throws out some obsolete manpages
208 lines
6 KiB
C
208 lines
6 KiB
C
/* $NetBSD: ttymsg.c,v 1.23 2009/01/18 12:13:04 lukem Exp $ */
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/*
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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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*
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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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* are met:
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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. 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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*
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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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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)ttymsg.c 8.2 (Berkeley) 11/16/93";
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#else
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__RCSID("$NetBSD: ttymsg.c,v 1.23 2009/01/18 12:13:04 lukem Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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/*
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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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*/
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char *
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ttymsg(struct iovec *iov, int iovcnt, const char *line, int tmout)
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{
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static char errbuf[1024];
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char device[MAXNAMLEN];
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const char *ptr;
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int fd, ret;
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struct iovec localiov[32];
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sigset_t nset;
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int forked = 0;
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size_t cnt, left, wret;
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_DIAGASSERT(iov != NULL);
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_DIAGASSERT(iovcnt >= 0);
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_DIAGASSERT(line != NULL);
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if (iovcnt < 0) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: negative iovcnt", __func__);
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return errbuf;
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}
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if ((size_t)iovcnt >= sizeof(localiov) / sizeof(localiov[0])) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: too many iov's (%d) max is %zu", __func__,
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iovcnt, sizeof(localiov) / sizeof(localiov[0]));
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return errbuf;
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}
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ptr = strncmp(line, "pts/", (size_t)4) == 0 ? line + 4 : line;
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if (strcspn(ptr, "./") != strlen(ptr)) {
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/* A slash or dot is an attempt to break security... */
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: '/' or '.' in \"%s\"", __func__, line);
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return errbuf;
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}
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ret = snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line);
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if (ret == -1 || ret >= (int)sizeof(device)) {
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(void) snprintf(errbuf, sizeof(errbuf),
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"%s: line `%s' too long", __func__, line);
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return errbuf;
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}
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cnt = (size_t)ret;
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/*
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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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*/
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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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return NULL;
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: Cannot open `%s' (%s)",
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__func__, device, strerror(errno));
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return errbuf;
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}
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if (!isatty(fd)) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: line `%s' is not a tty device", __func__, device);
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(void)close(fd);
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return errbuf;
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}
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for (cnt = left = 0; cnt < (size_t)iovcnt; ++cnt)
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left += iov[cnt].iov_len;
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for (;;) {
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wret = writev(fd, iov, iovcnt);
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if (wret >= left)
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break;
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if (wret > 0) {
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left -= wret;
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if (iov != localiov) {
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(void)memcpy(localiov, iov,
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iovcnt * sizeof(struct iovec));
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iov = localiov;
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}
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for (cnt = 0; wret >= iov->iov_len; ++cnt) {
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wret -= iov->iov_len;
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++iov;
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--iovcnt;
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}
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if (wret) {
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iov->iov_base =
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(char *)iov->iov_base + wret;
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iov->iov_len -= wret;
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}
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continue;
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} else if (wret == 0) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: failed writing %zu bytes to `%s'", __func__,
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left, device);
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(void) close(fd);
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if (forked)
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_exit(1);
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return errbuf;
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}
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if (errno == EWOULDBLOCK) {
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pid_t cpid;
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if (forked) {
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(void)close(fd);
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_exit(1);
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}
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cpid = fork();
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if (cpid < 0) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: Cannot fork (%s)", __func__,
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strerror(errno));
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(void)close(fd);
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return errbuf;
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}
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if (cpid) { /* parent */
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(void)close(fd);
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return NULL;
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}
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forked++;
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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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sigfillset(&nset);
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(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
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(void)alarm((u_int)tmout);
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(void)fcntl(fd, F_SETFL, 0); /* clear O_NONBLOCK */
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continue;
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}
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/*
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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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*/
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if (errno == ENODEV || errno == EIO)
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break;
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(void) close(fd);
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if (forked)
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_exit(1);
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(void)snprintf(errbuf, sizeof(errbuf),
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"%s: Write to line `%s' failed (%s)", __func__,
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device, strerror(errno));
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return errbuf;
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}
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(void) close(fd);
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if (forked)
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_exit(0);
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return NULL;
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}
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