diff options
| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-07-10 15:53:32 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-07-11 11:06:44 -0300 |
| commit | 94070f86c0c849c71ed2e7e2189bb4d1f7411a17 (patch) | |
| tree | a7de3d544fc1d3cb5a2b211e0d80b6daf6e93800 | |
| parent | 2a91300176a5991d9825eba085e502196a3f47cd (diff) | |
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.
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | manual/llio.texi | 4 | ||||
| -rw-r--r-- | misc/tst-preadvwritev2-common.c | 15 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/uio-ext.h | 1 |
4 files changed, 18 insertions, 10 deletions
@@ -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 ba1f455dfd..e72c53c785 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 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) }; diff --git a/sysdeps/unix/sysv/linux/bits/uio-ext.h b/sysdeps/unix/sysv/linux/bits/uio-ext.h index 4ddb6448b0..751fc4917d 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 |