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

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__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>
This commit is contained in:
Ulrich Drepper
2009-04-03 17:23:13 +00:00
parent a065c0076a
commit 2dbe6afe7c
6 changed files with 79 additions and 53 deletions
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13
sysdeps/unix/sysv/linux/readv.c
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@ -1,5 +1,5 @@
/* readv 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_readv_replacement (int, __const struct iovec *,
int) internal_function;
@ -45,10 +46,14 @@ do_readv (int fd, const struct iovec *vector, int count)
bytes_read = INLINE_SYSCALL (readv, 3, fd, CHECK_N (vector, count), count);
#ifdef __ASSUME_COMPLETE_READV_WRITEV
return bytes_read;
#else
if (bytes_read >= 0 || errno != EINVAL || count <= UIO_FASTIOV)
return bytes_read;
return __atomic_readv_replacement (fd, vector, count);
#endif
}
@ -72,5 +77,7 @@ __libc_readv (fd, vector, count)
strong_alias (__libc_readv, __readv)
weak_alias (__libc_readv, readv)
#define __libc_readv static internal_function __atomic_readv_replacement
#include <sysdeps/posix/readv.c>
#ifndef __ASSUME_COMPLETE_READV_WRITEV
# define __libc_readv static internal_function __atomic_readv_replacement
# include <sysdeps/posix/readv.c>
#endif