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authorUlrich Drepper <drepper@redhat.com>2009-04-03 17:23:13 +0000
committerUlrich Drepper <drepper@redhat.com>2009-04-03 17:23:13 +0000
commit2dbe6afe7c13af9790f2d37d3be3c8fa3262bd27 (patch)
tree6080f12475eef12e39f1df2cfd6be163fa5c82db /sysdeps/unix/sysv/linux/writev.c
parenta065c0076a1b76b9eb375ae051176e9bf518816a (diff)
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* sysdeps/unix/sysv/linux/kernel-features.h: Define
	__ASSUME_COMPLETE_READV_WRITEV.
	* sysdeps/unix/sysv/linux/readv.c: No need for userlevel fallback
	with modern kernels.
	* sysdeps/unix/sysv/linux/writev.c: Likewise.

	* sysdeps/posix/readv.c: Since read is a cancellation point we have
	to free a possible malloced buffer in case of cancellation.
	* sysdeps/posix/writev.c: Likewise for write.

c2009-04-01  Ulrich Drepper  <drepper@redhat.com>
Diffstat (limited to 'sysdeps/unix/sysv/linux/writev.c')
-rw-r--r--sysdeps/unix/sysv/linux/writev.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/writev.c b/sysdeps/unix/sysv/linux/writev.c
index 05978665fa..398a841bb3 100644
--- a/sysdeps/unix/sysv/linux/writev.c
+++ b/sysdeps/unix/sysv/linux/writev.c
@@ -1,5 +1,5 @@
 /* writev supports all Linux kernels >= 2.0.
-   Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+   Copyright (C) 1997,1998,2000,2002,2003,2009 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
@@ -25,6 +25,7 @@
 #include <sysdep-cancel.h>
 #include <sys/syscall.h>
 #include <bp-checks.h>
+#include <kernel-features.h>
 
 static ssize_t __atomic_writev_replacement (int, const struct iovec *,
 					    int) internal_function;
@@ -43,12 +44,17 @@ do_writev (int fd, const struct iovec *vector, int count)
 {
   ssize_t bytes_written;
 
-  bytes_written = INLINE_SYSCALL (writev, 3, fd, CHECK_N (vector, count), count);
+  bytes_written = INLINE_SYSCALL (writev, 3, fd, CHECK_N (vector, count),
+				  count);
 
+#ifdef __ASSUME_COMPLETE_READV_WRITEV
+  return bytes_written;
+#else
   if (bytes_written >= 0 || errno != EINVAL || count <= UIO_FASTIOV)
     return bytes_written;
 
   return __atomic_writev_replacement (fd, vector, count);
+#endif
 }
 
 ssize_t
@@ -71,5 +77,7 @@ __libc_writev (fd, vector, count)
 strong_alias (__libc_writev, __writev)
 weak_alias (__libc_writev, writev)
 
-#define __libc_writev static internal_function __atomic_writev_replacement
-#include <sysdeps/posix/writev.c>
+#ifndef __ASSUME_COMPLETE_READV_WRITEV
+# define __libc_writev static internal_function __atomic_writev_replacement
+# include <sysdeps/posix/writev.c>
+#endif