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posix: Add p{read,write}v2 RWF_NOWAIT flag (BZ#21738) 

Linux 4.12 (b745fafaf70c0a98a2e1e7ac8cb14542889ceb0e) adds a new
p{read,write}v2 flag RWF_NOWAIT.  This patch adds it for linux
uio-ext.h header.

Checked on x86_64-linux-gnu (on a 4.10 kernel).

	[BZ #21738]
	* manual/llio.texi (RWF_NOWAIT): New item.
	* misc/tst-preadvwritev2-common.c (do_test_with_invalid_flags):
	Add RWF_NOWAIT check.
	* sysdeps/unix/sysv/linux/bits/uio-ext.h (RWF_NOWAIT): New flag.
This commit is contained in:
Adhemerval Zanella 2017-07-10 15:53:32 -03:00
parent 2a91300176
commit 94070f86c0
4 changed files with 18 additions and 10 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2017-07-11 Adhemerval Zanella <adhemerval.zanella@linaro.org>
[BZ #21738]
* manual/llio.texi (RWF_NOWAIT): New item.
* misc/tst-preadvwritev2-common.c (do_test_with_invalid_flags):
Add RWF_NOWAIT check.
* sysdeps/unix/sysv/linux/bits/uio-ext.h (RWF_NOWAIT): New flag.
2017-07-11 Stefan Liebler <stli@linux.vnet.ibm.com>
* sysdeps/unix/sysv/linux/s390/tst-ptrace-singleblock.c:

4
manual/llio.texi
View File

@ -770,6 +770,10 @@ Per-IO synchronization as if the file was opened with @code{O_DSYNC} flag.
@item RWF_SYNC
Per-IO synchronization as if the file was opened with @code{O_SYNC} flag.
@item RWF_NOWAIT
Use nonblocking mode for this operation; that is, this call to @code{preadv2}
will fail and set @code{errno} to @code{EAGAIN} if the operation would block.
@end vtable
When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the

15
misc/tst-preadvwritev2-common.c
View File

@ -16,21 +16,16 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <limits.h>
#include <support/check.h>
static void
do_test_with_invalid_flags (void)
{
int invalid_flag = 0x1;
#ifdef RWF_HIPRI
invalid_flag <<= 1;
#endif
#ifdef RWF_DSYNC
invalid_flag <<= 1;
#endif
#ifdef RWF_SYNC
invalid_flag <<= 1;
#endif
#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT)
/* Set the next bit from the mask of all supported flags. */
int invalid_flag = __builtin_clz (RWF_SUPPORTED);
invalid_flag = 0x1 << ((sizeof (int) * CHAR_BIT) - invalid_flag);
char buf[32];
const struct iovec vec = { .iov_base = buf, .iov_len = sizeof (buf) };

1
sysdeps/unix/sysv/linux/bits/uio-ext.h
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@ -46,6 +46,7 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec,
#define RWF_HIPRI 0x00000001 /* High priority request. */
#define RWF_DSYNC 0x00000002 /* per-IO O_DSYNC. */
#define RWF_SYNC 0x00000004 /* per-IO O_SYNC. */
#define RWF_NOWAIT 0x00000008 /* per-IO nonblocking mode. */
__END_DECLS