diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/ptsname.c')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/ptsname.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/ptsname.c b/REORG.TODO/sysdeps/unix/sysv/linux/ptsname.c new file mode 100644 index 0000000000..41bb0bbb0e --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/ptsname.c @@ -0,0 +1,165 @@ +/* Copyright (C) 1998-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <paths.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/sysmacros.h> +#include <termios.h> +#include <unistd.h> + +#include <_itoa.h> + +/* Check if DEV corresponds to a master pseudo terminal device. */ +#define MASTER_P(Dev) \ + (major ((Dev)) == 2 \ + || (major ((Dev)) == 4 && minor ((Dev)) >= 128 && minor ((Dev)) < 192) \ + || (major ((Dev)) >= 128 && major ((Dev)) < 136)) + +/* Check if DEV corresponds to a slave pseudo terminal device. */ +#define SLAVE_P(Dev) \ + (major ((Dev)) == 3 \ + || (major ((Dev)) == 4 && minor ((Dev)) >= 192 && minor ((Dev)) < 256) \ + || (major ((Dev)) >= 136 && major ((Dev)) < 144)) + +/* Note that major number 4 corresponds to the old BSD style pseudo + terminal devices. As of Linux 2.1.115 these are no longer + supported. They have been replaced by major numbers 2 (masters) + and 3 (slaves). */ + +/* Directory where we can find the slave pty nodes. */ +#define _PATH_DEVPTS "/dev/pts/" + +/* The are declared in getpt.c. */ +extern const char __libc_ptyname1[] attribute_hidden; +extern const char __libc_ptyname2[] attribute_hidden; + +/* Static buffer for `ptsname'. */ +static char buffer[sizeof (_PATH_DEVPTS) + 20]; + + +/* Return the pathname of the pseudo terminal slave associated with + the master FD is open on, or NULL on errors. + The returned storage is good until the next call to this function. */ +char * +ptsname (int fd) +{ + return __ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer; +} + + +int +__ptsname_internal (int fd, char *buf, size_t buflen, struct stat64 *stp) +{ + int save_errno = errno; + unsigned int ptyno; + + if (!__isatty (fd)) + { + __set_errno (ENOTTY); + return ENOTTY; + } + +#ifdef TIOCGPTN + if (__ioctl (fd, TIOCGPTN, &ptyno) == 0) + { + /* Buffer we use to print the number in. For a maximum size for + `int' of 8 bytes we never need more than 20 digits. */ + char numbuf[21]; + const char *devpts = _PATH_DEVPTS; + const size_t devptslen = strlen (_PATH_DEVPTS); + char *p; + + numbuf[sizeof (numbuf) - 1] = '\0'; + p = _itoa_word (ptyno, &numbuf[sizeof (numbuf) - 1], 10, 0); + + if (buflen < devptslen + (&numbuf[sizeof (numbuf)] - p)) + { + __set_errno (ERANGE); + return ERANGE; + } + + memcpy (__stpcpy (buf, devpts), p, &numbuf[sizeof (numbuf)] - p); + } + else if (errno != EINVAL) + return errno; + else +#endif + { + char *p; + + if (buflen < strlen (_PATH_TTY) + 3) + { + __set_errno (ERANGE); + return ERANGE; + } + + if (__fxstat64 (_STAT_VER, fd, stp) < 0) + return errno; + + /* Check if FD really is a master pseudo terminal. */ + if (! MASTER_P (stp->st_rdev)) + { + __set_errno (ENOTTY); + return ENOTTY; + } + + ptyno = minor (stp->st_rdev); + + if (ptyno / 16 >= strlen (__libc_ptyname1)) + { + __set_errno (ENOTTY); + return ENOTTY; + } + + p = __stpcpy (buf, _PATH_TTY); + p[0] = __libc_ptyname1[ptyno / 16]; + p[1] = __libc_ptyname2[ptyno % 16]; + p[2] = '\0'; + } + + if (__xstat64 (_STAT_VER, buf, stp) < 0) + return errno; + + /* Check if the name we're about to return really corresponds to a + slave pseudo terminal. */ + if (! S_ISCHR (stp->st_mode) || ! SLAVE_P (stp->st_rdev)) + { + /* This really is a configuration problem. */ + __set_errno (ENOTTY); + return ENOTTY; + } + + __set_errno (save_errno); + return 0; +} + + +/* 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) +{ + struct stat64 st; + return __ptsname_internal (fd, buf, buflen, &st); +} +weak_alias (__ptsname_r, ptsname_r) |