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* sysdeps/unix/sysv/linux/kernel-features.h: Define

Browse source 
__ASSUME_PROC_SELF_FD_SYMLINK.
	* sysdeps/unix/sysv/linux/ttyname.c: Cleanups.  Avoid compatibility
	code is possible.  Move compatibility code in .text.compat section.
	* sysdeps/unix/sysv/linux/ttyname_r.c: Likewise.
This commit is contained in:
Ulrich Drepper 2006-04-19 07:27:58 +00:00
parent 786dcb6287
commit f9d07577ce
4 changed files with 56 additions and 25 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2006-04-19 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/kernel-features.h: Define
__ASSUME_PROC_SELF_FD_SYMLINK.
* sysdeps/unix/sysv/linux/ttyname.c: Cleanups. Avoid compatibility
code is possible. Move compatibility code in .text.compat section.
* sysdeps/unix/sysv/linux/ttyname_r.c: Likewise.
2006-04-18 Ulrich Drepper <drepper@redhat.com>
* sysdeps/posix/getaddrinfo.c (getaddrinfo): Rewrite to avoid loop

6
sysdeps/unix/sysv/linux/kernel-features.h
View file

@ -85,6 +85,12 @@
# define __ASSUME_SENDFILE 1
#endif
/* Only very old kernels had no real symlinks for terminal descriptors
in /proc/self/fd. */
#if __LINUX_KERNEL_VERSION >= 131584
# define __ASSUME_PROC_SELF_FD_SYMLINK 1
#endif
/* On x86 another `getrlimit' syscall was added in 2.3.25. */
#if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1

30
sysdeps/unix/sysv/linux/ttyname.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1991,92,93,1996-2001,2002 Free Software Foundation, Inc.
/* Copyright (C) 1991,92,93,1996-2002,2006 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
@ -27,6 +27,7 @@
#include <stdlib.h>
#include <stdio-common/_itoa.h>
#include <kernel-features.h>
#if 0
/* Is this used anywhere? It is not exported. */
@ -41,7 +42,7 @@ static char *getttyname (const char *dev, dev_t mydev,
libc_freeres_ptr (static char *getttyname_name);
static char *
internal_function
internal_function attribute_compat_text_section
getttyname (const char *dev, dev_t mydev, ino64_t myino, int save, int *dostat)
{
static size_t namelen;
@ -117,10 +118,12 @@ ttyname (int fd)
int dostat = 0;
char *name;
int save = errno;
int len;
if (!__isatty (fd))
return NULL;
if (__builtin_expect (!__isatty (fd), 0))
{
__set_errno (ENOTTY);
return NULL;
}
/* We try using the /proc filesystem. */
*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
@ -136,10 +139,19 @@ ttyname (int fd)
}
}
len = __readlink (procname, ttyname_buf, buflen);
if (len != -1
/* This is for Linux 2.0. */
&& ttyname_buf[0] != '[')
ssize_t len = __readlink (procname, ttyname_buf, buflen);
if (__builtin_expect (len == -1 && errno == ENOENT, 0))
{
__set_errno (EBADF);
return NULL;
}
if (__builtin_expect (len != -1
#ifndef __ASSUME_PROC_SELF_FD_SYMLINK
/* This is for Linux 2.0. */
&& ttyname_buf[0] != '['
#endif
, 1))
{
if ((size_t) len >= buflen)
return NULL;

37
sysdeps/unix/sysv/linux/ttyname_r.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1991,92,93,1995-2001, 2003 Free Software Foundation, Inc.
/* Copyright (C) 1991,92,93,1995-2001,2003,2006 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
@ -27,13 +27,14 @@
#include <stdlib.h>
#include <stdio-common/_itoa.h>
#include <kernel-features.h>
static int getttyname_r (char *buf, size_t buflen,
dev_t mydev, ino64_t myino, int save,
int *dostat) internal_function;
static int
internal_function
internal_function attribute_compat_text_section
getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino,
int save, int *dostat)
{
@ -99,7 +100,6 @@ __ttyname_r (int fd, char *buf, size_t buflen)
struct stat64 st, st1;
int dostat = 0;
int save = errno;
int ret;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
@ -115,29 +115,34 @@ __ttyname_r (int fd, char *buf, size_t buflen)
return ERANGE;
}
/* We try using the /proc filesystem. */
*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
ret = __readlink (procname, buf, buflen - 1);
if (ret == -1 && errno == ENOENT)
{
__set_errno (EBADF);
return EBADF;
}
if (!__isatty (fd))
if (__builtin_expect (!__isatty (fd), 0))
{
__set_errno (ENOTTY);
return ENOTTY;
}
if (ret == -1 && errno == ENAMETOOLONG)
/* We try using the /proc filesystem. */
*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
ssize_t ret = __readlink (procname, buf, buflen - 1);
if (__builtin_expect (ret == -1 && errno == ENOENT, 0))
{
__set_errno (EBADF);
return EBADF;
}
if (__builtin_expect (ret == -1 && errno == ENAMETOOLONG, 0))
{
__set_errno (ERANGE);
return ERANGE;
}
if (ret != -1 && buf[0] != '[')
if (__builtin_expect (ret != -1
#ifndef __ASSUME_PROC_SELF_FD_SYMLINK
/* This is for Linux 2.0. */
&& buf[0] != '['
#endif
, 1))
{
buf[ret] = '\0';
return 0;