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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-07-10 15:53:32 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-07-11 11:06:44 -0300
commit94070f86c0c849c71ed2e7e2189bb4d1f7411a17 (patch)
treea7de3d544fc1d3cb5a2b211e0d80b6daf6e93800 /misc
parent2a91300176a5991d9825eba085e502196a3f47cd (diff)
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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.
Diffstat (limited to 'misc')
-rw-r--r--misc/tst-preadvwritev2-common.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/misc/tst-preadvwritev2-common.c b/misc/tst-preadvwritev2-common.c
index 4c53d567b5..8abedc14d0 100644
--- a/misc/tst-preadvwritev2-common.c
+++ b/misc/tst-preadvwritev2-common.c
@@ -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) };