| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 |
| * COPYRIGHT OWNER 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. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/ioctl.h> |
| #include <termios.h> |
| #include <unistd.h> |
| |
| int getpt(void) { |
| return posix_openpt(O_RDWR|O_NOCTTY); |
| } |
| |
| int grantpt(int) { |
| return 0; |
| } |
| |
| int posix_openpt(int flags) { |
| return open("/dev/ptmx", flags); |
| } |
| |
| char* ptsname(int fd) { |
| static char buf[64]; |
| return ptsname_r(fd, buf, sizeof(buf)) == 0 ? buf : NULL; |
| } |
| |
| int ptsname_r(int fd, char* buf, size_t len) { |
| if (buf == NULL) { |
| errno = EINVAL; |
| return errno; |
| } |
| |
| unsigned int pty_num; |
| if (ioctl(fd, TIOCGPTN, &pty_num) != 0) { |
| errno = ENOTTY; |
| return errno; |
| } |
| |
| if (snprintf(buf, len, "/dev/pts/%u", pty_num) >= static_cast<int>(len)) { |
| errno = ERANGE; |
| return errno; |
| } |
| |
| return 0; |
| } |
| |
| char* ttyname(int fd) { |
| static char buf[64]; |
| return ttyname_r(fd, buf, sizeof(buf)) == 0 ? buf : NULL; |
| } |
| |
| int ttyname_r(int fd, char* buf, size_t len) { |
| if (buf == NULL) { |
| errno = EINVAL; |
| return errno; |
| } |
| |
| if (!isatty(fd)) { |
| return errno; |
| } |
| |
| char path[64]; |
| snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); |
| |
| ssize_t count = readlink(path, buf, len); |
| if (count == -1) { |
| return errno; |
| } |
| if (static_cast<size_t>(count) == len) { |
| errno = ERANGE; |
| return errno; |
| } |
| buf[count] = '\0'; |
| return 0; |
| } |
| |
| int unlockpt(int fd) { |
| int unlock = 0; |
| return ioctl(fd, TIOCSPTLCK, &unlock); |
| } |