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113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*-
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* Copyright (c) 2015 Stephen Heumann
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#ifdef __GNO__
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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/* Check if a given fd is the master side of a pty */
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static int is_pty(int fildes)
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{
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char *name;
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static const char pty_prefix[] = ".ptyq";
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name = ttyname(fildes);
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if (strncmp(pty_prefix, name, strlen(pty_prefix)) == 0)
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return 1;
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return 0;
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}
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/* Open the master size of a pty */
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int posix_openpt(int oflag)
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{
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char ptyname[7];
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int i;
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int master_fd, saved_errno;
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saved_errno = errno;
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oflag &= O_RDWR | O_NOCTTY;
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for(i = 0; i < 16; i++) {
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snprintf(ptyname, sizeof(ptyname), ".ptyq%x", i);
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master_fd = open(ptyname, oflag);
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if (master_fd > 0)
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break;
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}
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if (master_fd < 1) {
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if (errno != EMFILE)
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errno = EAGAIN;
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return -1;
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}
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errno = saved_errno;
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return master_fd;
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}
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/* Grant access to slave side of pty -- no-op on GNO */
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int grantpt(int fildes)
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{
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if (!is_pty(fildes)) {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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/* Unlock a pty -- no-op on GNO */
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int unlockpt(int fildes)
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{
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if (!is_pty(fildes)) {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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static char namebuf[7];
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char *ptsname(int fildes)
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{
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if (!is_pty(fildes)) {
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errno = EINVAL;
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return NULL;
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}
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strncpy(namebuf, ttyname(fildes), sizeof(namebuf));
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namebuf[1] = 't'; /* Convert ".ptyqX" to ".ttyqX" */
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namebuf[sizeof(namebuf)-1] = 0;
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return namebuf;
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}
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#endif
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