Update.

2002-12-19  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/system.c: Define FORK only if
	__ASSUME_CLONE_THREAD_FLAGS is defined.
	* sysdeps/unix/sysv/linux/kernel-features.h
	(__ASSUME_CLONE_THREAD_FLAGS): Define for x86 and kernel >=
	2.5.50.

	* sysdeps/unix/sysv/linux/i386/brk.c: Use INTERNAL_SYSCALL instead
	of asm.
	* sysdeps/unix/sysv/linux/i386/sigaction.c: Likewise.

ChangeLog

@@ -1,5 +1,17 @@
+2002-12-19  Ulrich Drepper  <drepper@redhat.com>
+
+	* sysdeps/unix/sysv/linux/i386/system.c: Define FORK only if
+	__ASSUME_CLONE_THREAD_FLAGS is defined.
+	* sysdeps/unix/sysv/linux/kernel-features.h
+	(__ASSUME_CLONE_THREAD_FLAGS): Define for x86 and kernel >=
+	2.5.50.
+
 2002-12-18  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/unix/sysv/linux/i386/brk.c: Use INTERNAL_SYSCALL instead
+	of asm.
+	* sysdeps/unix/sysv/linux/i386/sigaction.c: Likewise.
+
 	* elf/dl-support.c [NEED_DL_SYSINFO]: Define and initialize
 	_dl_sysinfo.
 	[DL_SYSINFO_IMPLEMENTATION]: If defined use it to generate the needed

sysdeps/unix/sysv/linux/i386/system.c

@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <sys/wait.h>
 #include <bits/libc-lock.h>
+#include <kernel-features.h>
 
 /* We have to and actually can handle cancelable system().  The big
    problem: we have to kill the child process if necessary.  To do
@@ -31,8 +32,10 @@
    return.  It might still be in the kernel when the cancellation
    request comes.  Therefore we have to use the clone() calls ability
    to have the kernel write the PID into the user-level variable.  */
-#define FORK() \
+#ifdef __ASSUME_CLONE_THREAD_FLAGS
+# define FORK() \
   INLINE_SYSCALL (clone, 3, CLONE_PARENT_SETTID | SIGCHLD, 0, &pid)
+#endif
 
 static void cancel_handler (void *arg);
 

sysdeps/unix/sysv/linux/kernel-features.h

@@ -232,3 +232,11 @@
 # define __ASSUME_FCNTL64		1
 # define __ASSUME_GETDENTS64_SYSCALL	1
 #endif
+
+/* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
+   their availability with one define.  The changes were made first
+   for i386 and the have to be done separately for the other archs.
+   For i386 we pick 2.5.50 as the first version with support.  */
+#if __LINUX_KERNEL_VERSION >= 132432
+# define __ASSUME_CLONE_THREAD_FLAGS	1
+#endif