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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2016-06-14 17:56:33 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2016-06-21 11:29:18 -0300 |
| commit | 4751bbe2ad4d1bfa05774e29376d553ecfe563b0 (patch) | |
| tree | 029d8253f0c76d8ab16f6f477dd53007113e7c55 /sysdeps/unix/sysv/linux/sysdep.h | |
| parent | df2258c6cb4250e53f12b59785987c338b5cf396 (diff) | |
| download | glibc-4751bbe2ad4d1bfa05774e29376d553ecfe563b0.tar glibc-4751bbe2ad4d1bfa05774e29376d553ecfe563b0.tar.gz glibc-4751bbe2ad4d1bfa05774e29376d553ecfe563b0.tar.bz2 glibc-4751bbe2ad4d1bfa05774e29376d553ecfe563b0.zip | |
Fix p{readv,writev}{64} consolidation implementation
This patch fixes the p{readv,writev}{64} consolidation implementation
from commits 4e77815 and af5fdf5. Different from pread/pwrite
implementation, preadv/pwritev implementation does not require
__ALIGNMENT_ARG because kernel syscall prototypes define
the high and low part of the off_t, if it is the case, directly
(different from pread/pwrite where the architecture ABI for passing
64-bit values must be in consideration for passsing the arguments).
It also adds some basic tests for preadv/pwritev.
Tested on x86_64, i686, and armhf.
* misc/Makefile (tests): Add tst-preadvwritev and tst-preadvwritev64.
* misc/tst-preadvwritev.c: New file.
* misc/tst-preadvwritev64.c: Likewise.
* sysdeps/unix/sysv/linux/preadv.c (preadv): Remove SYSCALL_LL{64}
usage.
* sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise.
* sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise.
* sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise.
* sysdeps/unix/sysv/linux/sysdep.h (LO_HI_LONG): New macro.
Diffstat (limited to 'sysdeps/unix/sysv/linux/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysdep.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sysdep.h b/sysdeps/unix/sysv/linux/sysdep.h index f2d7e05975..8c9e62efb0 100644 --- a/sysdeps/unix/sysv/linux/sysdep.h +++ b/sysdeps/unix/sysv/linux/sysdep.h @@ -47,3 +47,12 @@ #define SYSCALL_LL64(val) \ __LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff)) #endif + +/* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */ +#if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32 +# define LO_HI_LONG(val) (val) +#else +# define LO_HI_LONG(val) \ + (long) (val), \ + (long) (((uint64_t) (val)) >> 32) +#endif |