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1999-05-26  Ulrich Drepper  <drepper@cygnus.com>

	* config.h.in: Add __LINUX_KERNEL_VERSION.
	* configure.in: Recognize --enable-kernel.
	* sysdeps/unix/sysv/linux/configure.in: Check for correct kernel
	headers if --enable-kernel is given and set __LINUX_KERNEL_VERSION
	appropriately.
	* sysdeps/unix/sysv/linux/init-first.c: If minimal kernel version is
	given perform runtime test.

	* sysdeps/unix/sysv/linux/kernel-features.h: New file.
	* sysdeps/unix/sysv/linux/getcwd.c: Elide compatibility code if
	minimal supported kernel is known to have the feature.
	* sysdeps/unix/sysv/linux/poll.c: Likewise.
	* sysdeps/unix/sysv/linux/pread.c: Likewise.
	* sysdeps/unix/sysv/linux/pread64.c: Likewise.
	* sysdeps/unix/sysv/linux/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/pwrite64.c: Likewise.
	* sysdeps/unix/sysv/linux/seteuid.c: Likewise.
	* sysdeps/unix/sysv/linux/sigaction.c: Likewise.
	* sysdeps/unix/sysv/linux/sigprocmask.c: Likewise.
	* sysdeps/unix/sysv/linux/sigsuspend.c: Likewise.
	* sysdeps/unix/sysv/linux/testrtsig.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/chown.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pread.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pread64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pwrite64.c: Likewise.

	* sysdeps/unix/sysv/linux/sysctl.c: Add __sysctl alias.
This commit is contained in:
Ulrich Drepper
1999-05-26 23:37:38 +00:00
parent 475e390e80
commit 958f238f36
26 changed files with 744 additions and 262 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
sysdeps/unix/sysv/linux/getcwd.c
View File

@@ -18,6 +18,7 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
@@ -26,7 +27,19 @@
#include <sysdep.h>
#include <sys/syscall.h>
#include "kernel-features.h"
#if __ASSUME_GETCWD_SYSCALL > 0
/* Kernel 2.1.92 introduced a third way to get the current working
directory: a syscall. We've got to be careful that even when
compiling under 2.1.92+ the libc still runs under older kernels. */
extern int __syscall_getcwd (char *buf, unsigned long size);
# define no_syscall_getcwd 0
# define have_new_dcache 1
/* This is a trick since we don't define generic_getcwd. */
# define generic_getcwd getcwd
#else
/* The "proc" filesystem provides an easy method to retrieve the value.
For each process, the corresponding directory contains a symbolic link
named `cwd'. Reading the content of this link immediate gives us the
@@ -34,16 +47,17 @@
the proc filesystem mounted. Use the POSIX implementation in this case. */
static char *generic_getcwd (char *buf, size_t size) internal_function;
#ifdef __NR_getcwd
# if __NR_getcwd
/* Kernel 2.1.92 introduced a third way to get the current working
directory: a syscall. We've got to be careful that even when
compiling under 2.1.92+ the libc still runs under older kernels. */
extern int __syscall_getcwd (char *buf, unsigned long size);
static int no_syscall_getcwd;
static int have_new_dcache;
#else
# define no_syscall_getcwd 1
# else
# define no_syscall_getcwd 1
static int have_new_dcache = 1;
# endif
#endif
char *
@@ -80,7 +94,7 @@ __getcwd (char *buf, size_t size)
save_errno = errno;
#ifdef __NR_getcwd
#if defined __NR_getcwd || __LINUX_GETCWD_SYSCALL > 0
if (!no_syscall_getcwd)
{
int retval;
@@ -98,6 +112,16 @@ __getcwd (char *buf, size_t size)
return buf;
}
# if __ASSUME_GETCWD_SYSCALL
/* It should never happen that the `getcwd' syscall failed because
the buffer is too small if we allocated the buffer outself. */
assert (errno != ERANGE || buf != NULL);
if (buf == NULL)
free (path);
return NULL;
# else
if (errno == ENOSYS)
{
no_syscall_getcwd = 1;
@@ -111,6 +135,7 @@ __getcwd (char *buf, size_t size)
}
__set_errno (save_errno);
# endif
}
#endif
@@ -136,14 +161,18 @@ __getcwd (char *buf, size_t size)
}
return buf;
}
#ifndef have_new_dcache
else
have_new_dcache = 0;
#endif
}
#if __ASSUME_GETCWD_SYSCALL == 0
/* Set to have_new_dcache only if error indicates that proc doesn't
exist. */
if (errno != EACCES && errno != ENAMETOOLONG)
have_new_dcache = 0;
#endif
/* Something went wrong. Restore the error number and use the generic
version. */
@@ -165,7 +194,9 @@ __getcwd (char *buf, size_t size)
}
weak_alias (__getcwd, getcwd)
#if __ASSUME_GETCWD_SYSCALL == 0
/* Get the code for the generic version. */
#define GETCWD_RETURN_TYPE static char * internal_function
#define __getcwd generic_getcwd
#include <sysdeps/posix/getcwd.c>
# define GETCWD_RETURN_TYPE static char * internal_function
# define __getcwd generic_getcwd
# include <sysdeps/posix/getcwd.c>
#endif