GNU C Library master sources branch master updated. glibc-2.25-713-g94070f8

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=94070f86c0c849c71ed2e7e2189bb4d1f7411a17

commit 94070f86c0c849c71ed2e7e2189bb4d1f7411a17
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Jul 10 15:53:32 2017 -0300

    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.

diff --git a/ChangeLog b/ChangeLog
index 71d027d..7ee4f2d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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:
diff --git a/manual/llio.texi b/manual/llio.texi
index ba1f455..e72c53c 100644
--- a/manual/llio.texi
+++ b/manual/llio.texi
@@ -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
diff --git a/misc/tst-preadvwritev2-common.c b/misc/tst-preadvwritev2-common.c
index 4c53d56..8abedc1 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) };
diff --git a/sysdeps/unix/sysv/linux/bits/uio-ext.h b/sysdeps/unix/sysv/linux/bits/uio-ext.h
index 4ddb644..751fc49 100644
--- a/sysdeps/unix/sysv/linux/bits/uio-ext.h
+++ b/sysdeps/unix/sysv/linux/bits/uio-ext.h
@@ -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
 

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                              |    8 ++++++++
 manual/llio.texi                       |    4 ++++
 misc/tst-preadvwritev2-common.c        |   15 +++++----------
 sysdeps/unix/sysv/linux/bits/uio-ext.h |    1 +
 4 files changed, 18 insertions(+), 10 deletions(-)


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