glibc/sysdeps/unix/sysv/linux/ttyname.c
Andreas Jaeger bcaad6ee58 Update.
* csu/munch-tmpl.c (__libc_init): Remove K&R support.
	* dirent/scandir64.c: Likewise.
	* pwd/getpw.c: Likewise.
	* stdlib/bsearch.c (bsearch): Likewise.
	* stdlib/tst-strtoll.c: Likewise.
	* localedata/collate-test.c: Likewise.
	* localedata/xfrm-test.c: Likewise.
	* posix/bsd-getpgrp.c: Likewise.
	* sysdeps/alpha/fpu/bits/fenv.h: Likewise.
	* sysdeps/generic/bits/siginfo.h: Likewise.
	* sysdeps/generic/bits/sockaddr.h: Likewise.
	* sysdeps/generic/sys/swap.h: Likewise.
	* sysdeps/generic/sys/sysinfo.h: Likewise.
	* sysdeps/generic/vfork.c: Likewise.
	* sysdeps/m68k/fpu/switch/68881-sw.h: Likewise.
	* sysdeps/mach/hurd/fdopen.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/sys/acct.h: Likewise.
	* sysdeps/unix/sysv/linux/poll.c: Likewise.
	* sysdeps/unix/sysv/linux/readv.c: Likewise.
	* sysdeps/unix/sysv/linux/writev.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/setgroups.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/ipc.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/sigaction.h: Likewise.

	* misc/tst-dirname.c: Remove K&R support, use ANSI C prototypes.
	* shadow/lckpwdf.c: Likewise.
	* stdlib/tst-strtol.c: Likewise.
	* sysdeps/generic/tcsetattr.c: Likewise.
	* sysdeps/unix/sysv/linux/ttyname.c: Likewise.
	* sysdeps/unix/sysv/linux/ttyname_r.c: Likewise.
2000-05-23 08:43:26 +00:00

178 lines
4.3 KiB
C

/* Copyright (C) 1991,92,93,96,97,98,99,2000 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;
static char * getttyname (const char *dev, dev_t mydev,
ino_t myino, int save, int *dostat)
internal_function;
static char *
internal_function
getttyname (const char *dev, dev_t mydev, ino_t myino, int save, int *dostat)
{
static char *name;
static size_t namelen;
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 (int fd)
{
static char *buf;
static size_t buflen;
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;
}