| /* Determine name of the slave side of a pseudo-terminal. |
| Copyright (C) 1998, 2002, 2010-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| #include <stdlib.h> |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #ifdef _LIBC |
| # include <paths.h> |
| #else |
| # ifndef _PATH_TTY |
| # define _PATH_TTY "/dev/tty" |
| # endif |
| # ifndef _PATH_DEV |
| # define _PATH_DEV "/dev/" |
| # endif |
| |
| # undef __set_errno |
| # undef __stat |
| # undef __ttyname_r |
| # undef __ptsname_r |
| |
| # define __set_errno(e) errno = (e) |
| # define __isatty isatty |
| # define __stat stat |
| # define __ttyname_r ttyname_r |
| # define __ptsname_r ptsname_r |
| |
| #endif |
| |
| /* Get the major, minor macros. */ |
| #if MAJOR_IN_MKDEV |
| # include <sys/mkdev.h> |
| #endif |
| #if MAJOR_IN_SYSMACROS |
| # include <sys/sysmacros.h> |
| #endif |
| |
| #ifdef __sun |
| /* Get ioctl() and 'struct strioctl'. */ |
| # include <stropts.h> |
| /* Get ISPTM. */ |
| # include <sys/stream.h> |
| # include <sys/ptms.h> |
| # include <stdio.h> |
| #endif |
| |
| #if defined _AIX || defined __osf__ |
| /* Get ioctl(), ISPTM. */ |
| # include <sys/ioctl.h> |
| # include <stdio.h> |
| #endif |
| |
| |
| /* Store at most BUFLEN characters of the pathname of the slave pseudo |
| terminal associated with the master FD is open on in BUF. |
| Return 0 on success, otherwise an error number. */ |
| int |
| __ptsname_r (int fd, char *buf, size_t buflen) |
| #undef ptsname_r |
| { |
| #if HAVE_ESSENTIALLY_WORKING_PTSNAME_R |
| int ret = ptsname_r (fd, buf, buflen); |
| if (ret == 0) |
| return 0; |
| else |
| return errno; |
| #else |
| int save_errno = errno; |
| int err; |
| struct stat st; |
| |
| if (buf == NULL) |
| { |
| __set_errno (EINVAL); |
| return EINVAL; |
| } |
| |
| # if defined __sun /* Solaris */ |
| if (fstat (fd, &st) < 0) |
| return errno; |
| if (!(S_ISCHR (st.st_mode) && major (st.st_rdev) == 0)) |
| { |
| errno = ENOTTY; |
| return errno; |
| } |
| { |
| /* Master ptys can be recognized through a STREAMS ioctl. See |
| "STREAMS-based Pseudo-Terminal Subsystem" |
| <https://docs.oracle.com/cd/E18752_01/html/816-4855/termsub15-44781.html> |
| and "STREAMS ioctl commands" |
| <https://docs.oracle.com/cd/E18752_01/html/816-5177/streamio-7i.html> |
| */ |
| struct strioctl ioctl_arg; |
| ioctl_arg.ic_cmd = ISPTM; |
| ioctl_arg.ic_timout = 0; |
| ioctl_arg.ic_len = 0; |
| ioctl_arg.ic_dp = NULL; |
| |
| if (ioctl (fd, I_STR, &ioctl_arg) < 0) |
| { |
| errno = ENOTTY; |
| return errno; |
| } |
| } |
| { |
| char tmpbuf[9 + 10 + 1]; |
| int n = sprintf (tmpbuf, "/dev/pts/%u", minor (st.st_rdev)); |
| if (n >= buflen) |
| { |
| errno = ERANGE; |
| return errno; |
| } |
| memcpy (buf, tmpbuf, n + 1); |
| } |
| # elif defined _AIX || defined __osf__ /* AIX, OSF/1 */ |
| /* This implementation returns /dev/pts/N, like ptsname() does. |
| Whereas the generic implementation below returns /dev/ttypN. |
| Both are correct, but let's be consistent with ptsname(). */ |
| if (fstat (fd, &st) < 0) |
| return errno; |
| if (!S_ISCHR (st.st_mode)) |
| { |
| errno = ENOTTY; |
| return errno; |
| } |
| { |
| int ret; |
| int dev; |
| char tmpbuf[9 + 10 + 1]; |
| int n; |
| # ifdef _AIX |
| ret = ioctl (fd, ISPTM, &dev); |
| # endif |
| # ifdef __osf__ |
| ret = ioctl (fd, ISPTM, NULL); |
| dev = ret; |
| # endif |
| if (ret < 0) |
| { |
| errno = ENOTTY; |
| return errno; |
| } |
| n = sprintf (tmpbuf, "/dev/pts/%u", minor (dev)); |
| if (n >= buflen) |
| { |
| errno = ERANGE; |
| return errno; |
| } |
| memcpy (buf, tmpbuf, n + 1); |
| } |
| # else |
| if (!__isatty (fd)) |
| { |
| # if ISATTY_FAILS_WITHOUT_SETTING_ERRNO && defined F_GETFL /* IRIX, Solaris */ |
| /* Set errno. */ |
| if (fcntl (fd, F_GETFL) != -1) |
| errno = ENOTTY; |
| # else |
| /* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */ |
| # endif |
| return errno; |
| } |
| |
| if (buflen < strlen (_PATH_TTY) + 3) |
| { |
| __set_errno (ERANGE); |
| return ERANGE; |
| } |
| |
| err = __ttyname_r (fd, buf, buflen); |
| if (err != 0) |
| { |
| __set_errno (err); |
| return errno; |
| } |
| |
| if (strncmp(buf, "/dev/pts/", strlen("/dev/pts/")) != 0) |
| buf[sizeof (_PATH_DEV) - 1] = 't'; |
| # endif |
| |
| if (__stat (buf, &st) < 0) |
| return errno; |
| |
| __set_errno (save_errno); |
| return 0; |
| #endif |
| } |