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glibc/sysdeps/unix/sysv/linux/ptsname.c
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/* Copyright (C) 1998 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 Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If not, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <sys/types.h> | |
#include <sys/ioctl.h> | |
#include <sys/stat.h> | |
#include <termios.h> | |
#include <string.h> | |
#include <errno.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include "pty-internal.h" | |
#include <stdio-common/_itoa.h> | |
#include <sys/sysmacros.h> | |
/* Given the file descriptor of a master pty, return the pathname | |
of the associated slave. */ | |
static char namebuf[PTYNAMELEN]; | |
extern const char __ptyname1[], __ptyname2[]; /* Defined in getpt.c. */ | |
char * | |
ptsname (fd) | |
int fd; | |
{ | |
return __ptsname_r (fd, namebuf, PTYNAMELEN) != 0 ? NULL : namebuf; | |
} | |
int | |
__ptsname_r (fd, buf, buflen) | |
int fd; | |
char *buf; | |
size_t buflen; | |
{ | |
struct stat st; | |
int save = errno; | |
int ptyno; | |
char nbuf[PTYNAMELEN], idbuf[6]; | |
char *cp; | |
#ifdef TIOCGPTN | |
static int tiocgptn_works = 1; | |
#endif | |
if (!buf) | |
{ | |
__set_errno (EINVAL); | |
return EINVAL; | |
} | |
if (!__isatty (fd)) | |
{ | |
__set_errno (ENOTTY); | |
return ENOTTY; | |
} | |
#ifdef TIOCGPTN | |
if (tiocgptn_works) | |
{ | |
if (ioctl (fd, TIOCGPTN, &ptyno) == 0) | |
goto gotit; | |
else | |
{ | |
if(errno != EINVAL) | |
return errno; | |
else | |
tiocgptn_works = 0; | |
} | |
} | |
#endif | |
if (__fxstat (_STAT_VER, fd, &st) < 0) | |
return errno; | |
ptyno = minor (st.st_rdev); | |
if (major (st.st_rdev) == 4) | |
ptyno -= 128; | |
#ifdef TIOCGPTN | |
gotit: | |
#endif | |
/* Two different possible naming schemes for pty slaves: | |
the SVr4 way. */ | |
idbuf[5] = '\0'; | |
__stpcpy (__stpcpy (nbuf, "/dev/pts/"), | |
_itoa_word (ptyno, &idbuf[5], 10, 0)); | |
if (__xstat (_STAT_VER, nbuf, &st) < 0) | |
{ | |
if (errno != ENOENT) | |
return errno; | |
/* ...and the BSD way. */ | |
nbuf[5] = 't'; | |
nbuf[7] = 'y'; | |
nbuf[8] = __ptyname1[ptyno / 16]; | |
nbuf[9] = __ptyname2[ptyno % 16]; | |
nbuf[10] = '\0'; | |
if (__xstat (_STAT_VER, nbuf, &st) < 0) | |
return errno; | |
} | |
if (buflen < strlen (nbuf) + 1) | |
{ | |
__set_errno (ERANGE); | |
return ERANGE; | |
} | |
cp = __stpncpy (buf, nbuf, buflen); | |
cp[0] = '\0'; | |
__set_errno (save); | |
return 0; | |
} | |
weak_alias (__ptsname_r, ptsname_r) |