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/* Copyright (C) 1991, 92, 93, 96, 97, 98, 99 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <errno.h>
#include <limits.h>
#include <stddef.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio-common/_itoa.h>
char *__ttyname = NULL;
static char * getttyname __P ((const char *dev, dev_t mydev,
ino_t myino, int save, int *dostat))
internal_function;
static char *
internal_function
getttyname (dev, mydev, myino, save, dostat)
const char *dev;
dev_t mydev;
ino_t myino;
int save;
int *dostat;
{
static char *name;
static size_t namelen = 0;
struct stat st;
DIR *dirstream;
struct dirent *d;
size_t devlen = strlen (dev) + 1;
dirstream = opendir (dev);
if (dirstream == NULL)
{
*dostat = -1;
return NULL;
}
while ((d = readdir (dirstream)) != NULL)
if (((ino_t) d->d_fileno == myino || *dostat)
&& strcmp (d->d_name, "stdin")
&& strcmp (d->d_name, "stdout")
&& strcmp (d->d_name, "stderr"))
{
size_t dlen = _D_ALLOC_NAMLEN (d);
if (devlen + dlen > namelen)
{
free (name);
namelen = 2 * (devlen + dlen); /* Big enough. */
name = malloc (namelen);
if (! name)
{
*dostat = -1;
/* Perhaps it helps to free the directory stream buffer. */
(void) __closedir (dirstream);
return NULL;
}
*((char *) __mempcpy (name, dev, devlen - 1)) = '/';
}
memcpy (&name[devlen], d->d_name, dlen);
if (__xstat (_STAT_VER, name, &st) == 0
#ifdef _STATBUF_ST_RDEV
&& S_ISCHR (st.st_mode) && st.st_rdev == mydev
#else
&& (ino_t) d->d_fileno == myino && st.st_dev == mydev
#endif
)
{
(void) __closedir (dirstream);
__ttyname = name;
__set_errno (save);
return name;
}
}
(void) __closedir (dirstream);
__set_errno (save);
return NULL;
}
/* Return the pathname of the terminal FD is open on, or NULL on errors.
The returned storage is good only until the next call to this function. */
char *
ttyname (fd)
int fd;
{
static char *buf;
static size_t buflen = 0;
char procname[30];
struct stat st, st1;
int dostat = 0;
char *name;
int save = errno;
int len;
if (!__isatty (fd))
return NULL;
/* We try using the /proc filesystem. */
*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
if (buflen == 0)
{
buflen = 4095;
buf = (char *) malloc (buflen + 1);
if (buf == NULL)
{
buflen = 0;
return NULL;
}
}
len = __readlink (procname, buf, buflen);
if (len != -1
/* This is for Linux 2.0. */
&& buf[0] != '[')
{
if (len >= buflen)
return NULL;
/* readlink need not terminate the string. */
buf[len] = '\0';
return buf;
}
if (__fxstat (_STAT_VER, fd, &st) < 0)
return NULL;
if (__xstat (_STAT_VER, "/dev/pts", &st1) == 0 && S_ISDIR (st1.st_mode))
{
#ifdef _STATBUF_ST_RDEV
name = getttyname ("/dev/pts", st.st_rdev, st.st_ino, save, &dostat);
#else
name = getttyname ("/dev/pts", st.st_dev, st.st_ino, save, &dostat);
#endif
}
else
{
__set_errno (save);
name = NULL;
}
if (!name && dostat != -1)
{
#ifdef _STATBUF_ST_RDEV
name = getttyname ("/dev", st.st_rdev, st.st_ino, save, &dostat);
#else
name = getttyname ("/dev", st.st_dev, st.st_ino, save, &dostat);
#endif
}
if (!name && dostat != -1)
{
dostat = 1;
#ifdef _STATBUF_ST_RDEV
name = getttyname ("/dev", st.st_rdev, st.st_ino, save, &dostat);
#else
name = getttyname ("/dev", st.st_dev, st.st_ino, save, &dostat);
#endif
}
return name;
}
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