Update.

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.

5 files changed, 61 insertions, 22 deletions

diff --git a/sysdeps/unix/sysv/linux/i386/chown.c b/sysdeps/unix/sysv/linux/i386/chown.c
index 3776a4490c..9ab03e3a7c 100644
--- a/sysdeps/unix/sysv/linux/i386/chown.c
+++ b/sysdeps/unix/sysv/linux/i386/chown.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1998, 1999 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
@@ -22,6 +22,8 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
+#include <kernel-features.h>
+
 /*
   In Linux 2.1.x the chown functions have been changed.  A new function lchown
   was introduced.  The new chown now follows symlinks - the old chown and the
@@ -34,14 +36,15 @@
 
 extern int __syscall_chown (const char *__file,
 			    uid_t __owner, gid_t __group);
-#ifdef __NR_lchown
+#if defined __NR_lchown || __ASSUME_LCHOWN_SYSCALL > 0
 /* Running under Linux > 2.1.80.  */
-static int __libc_old_chown;
 
 
 int
 __real_chown (const char *file, uid_t owner, gid_t group)
 {
+# if __ASSUME_LCHOWN_SYSCALL == 0
+  static int __libc_old_chown;
   int result;
 
   if (!__libc_old_chown)
@@ -57,11 +60,14 @@ __real_chown (const char *file, uid_t owner, gid_t group)
     }
 
   return __lchown (file, owner, group);
+# else
+  return INLINE_SYSCALL (chown, 3, file, owner, group);
+# endif
 }
 #endif
 
 
-#ifndef __NR_lchown
+#if !defined __NR_lchown && __ASSUME_LCHOWN_SYSCALL == 0
 /* Compiling under older kernels.  */
 int
 __chown_is_lchown (const char *file, uid_t owner, gid_t group)
diff --git a/sysdeps/unix/sysv/linux/i386/pread.c b/sysdeps/unix/sysv/linux/i386/pread.c
index 4c2f18d3f2..5745648306 100644
--- a/sysdeps/unix/sysv/linux/i386/pread.c
+++ b/sysdeps/unix/sysv/linux/i386/pread.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -23,10 +23,14 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
-#ifdef __NR_pread
+#include <kernel-features.h>
 
+#if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0
+
+# if __ASSUME_PREAD_SYSCALL == 0
 static ssize_t __emulate_pread (int fd, void *buf, size_t count,
 				off_t offset) internal_function;
+# endif
 
 
 ssize_t
@@ -40,16 +44,21 @@ __pread (fd, buf, count, offset)
 
   /* First try the syscall.  */
   result = INLINE_SYSCALL (pread, 5, fd, buf, count, offset, 0);
+# if __ASSUME_PREAD_SYSCALL == 0
   if (result == -1 && errno == ENOSYS)
     /* No system call available.  Use the emulation.  */
     result = __emulate_pread (fd, buf, count, offset);
+# endif
 
   return result;
 }
 
 weak_alias (__pread, pread)
 
-#define __pread(fd, buf, count, offset) \
+# define __pread(fd, buf, count, offset) \
      static internal_function __emulate_pread (fd, buf, count, offset)
 #endif
-#include <sysdeps/posix/pread.c>
+
+#if __ASSUME_PREAD_SYSCALL == 0
+# include <sysdeps/posix/pread.c>
+#endif
diff --git a/sysdeps/unix/sysv/linux/i386/pread64.c b/sysdeps/unix/sysv/linux/i386/pread64.c
index 8cfb3c0a43..aa0c54d385 100644
--- a/sysdeps/unix/sysv/linux/i386/pread64.c
+++ b/sysdeps/unix/sysv/linux/i386/pread64.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -23,13 +23,14 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
-#ifdef __NR_pread
+#include <kernel-features.h>
 
-extern ssize_t __syscall_pread64 (int fd, void *buf, size_t count,
-				  off_t offset_hi, off_t offset_lo);
+#if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0
 
+# if __ASSUME_PREAD_SYSCALL == 0
 static ssize_t __emulate_pread64 (int fd, void *buf, size_t count,
 				  off64_t offset) internal_function;
+# endif
 
 
 ssize_t
@@ -45,16 +46,21 @@ __pread64 (fd, buf, count, offset)
   result = INLINE_SYSCALL (pread, 5, fd, buf, count,
 			   (off_t) (offset & 0xffffffff),
 			   (off_t) (offset >> 32));
+# if __ASSUME_PREAD_SYSCALL == 0
   if (result == -1 && errno == ENOSYS)
     /* No system call available.  Use the emulation.  */
     result = __emulate_pread64 (fd, buf, count, offset);
+# endif
 
   return result;
 }
 
 weak_alias (__pread64, pread64)
 
-#define __pread64(fd, buf, count, offset) \
+# define __pread64(fd, buf, count, offset) \
      static internal_function __emulate_pread64 (fd, buf, count, offset)
 #endif
-#include <sysdeps/posix/pread64.c>
+
+#if __ASSUME_PREAD_SYSCALL == 0
+# include <sysdeps/posix/pread64.c>
+#endif
diff --git a/sysdeps/unix/sysv/linux/i386/pwrite.c b/sysdeps/unix/sysv/linux/i386/pwrite.c
index a1fc99f156..90eee5b4e1 100644
--- a/sysdeps/unix/sysv/linux/i386/pwrite.c
+++ b/sysdeps/unix/sysv/linux/i386/pwrite.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -23,10 +23,14 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
-#ifdef __NR_pwrite
+#include <kernel-features.h>
 
+#if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
+
+# if __ASSUME_PWRITE_SYSCALL == 0
 static ssize_t __emulate_pwrite (int fd, const void *buf, size_t count,
 				 off_t offset) internal_function;
+# endif
 
 
 ssize_t
@@ -40,16 +44,21 @@ __pwrite (fd, buf, count, offset)
 
   /* First try the syscall.  */
   result = INLINE_SYSCALL (pwrite, 5, fd, buf, count, offset, 0);
+# if __ASSUME_PWRITE_SYSCALL == 0
   if (result == -1 && errno == ENOSYS)
     /* No system call available.  Use the emulation.  */
     result = __emulate_pwrite (fd, buf, count, offset);
+# endif
 
   return result;
 }
 
 weak_alias (__pwrite, pwrite)
 
-#define __pwrite(fd, buf, count, offset) \
+# define __pwrite(fd, buf, count, offset) \
      static internal_function __emulate_pwrite (fd, buf, count, offset)
 #endif
-#include <sysdeps/posix/pwrite.c>
+
+#if __ASSUME_PWRITE_SYSCALL == 0
+# include <sysdeps/posix/pwrite.c>
+#endif
diff --git a/sysdeps/unix/sysv/linux/i386/pwrite64.c b/sysdeps/unix/sysv/linux/i386/pwrite64.c
index 7a5d665de3..500cd7cef3 100644
--- a/sysdeps/unix/sysv/linux/i386/pwrite64.c
+++ b/sysdeps/unix/sysv/linux/i386/pwrite64.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -23,10 +23,14 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
-#ifdef __NR_pwrite
+#include <kernel-features.h>
 
+#if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
+
+# if __ASSUME_PWRITE_SYSCALL == 0
 static ssize_t __emulate_pwrite64 (int fd, const void *buf, size_t count,
 				   off64_t offset) internal_function;
+# endif
 
 
 ssize_t
@@ -42,16 +46,21 @@ __pwrite64 (fd, buf, count, offset)
   result = INLINE_SYSCALL (pwrite, 5, fd, buf, count,
 			   (off_t) (offset & 0xffffffff),
 			   (off_t) (offset >> 32));
+# if __ASSUME_PWRITE_SYSCALL == 0
   if (result == -1 && errno == ENOSYS)
     /* No system call available.  Use the emulation.  */
     result = __emulate_pwrite64 (fd, buf, count, offset);
+# endif
 
   return result;
 }
 
 weak_alias (__pwrite64, pwrite64)
 
-#define __pwrite64(fd, buf, count, offset) \
+# define __pwrite64(fd, buf, count, offset) \
      static internal_function __emulate_pwrite64 (fd, buf, count, offset)
 #endif
-#include <sysdeps/posix/pwrite64.c>
+
+#if __ASSUME_PWRITE_SYSCALL == 0
+# include <sysdeps/posix/pwrite64.c>
+#endif