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52bd938169
This patch adds support of preadv2 and pwritev2 which are similar to
preadv/pwritev but with an extra flag argument. As for preadv/pwritev
both interfaces are added a non-standard GNU API.
For default 'posix' implementation trying to emulate the Linux supported
flags is troublesome:
* We can not temporary change the file state of the O_DSYNC and O_SYNC
flags to emulate RWF_{D}SYNC (attempts to change the state of using
fcntl are silently ignored).
* IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
semantic not provided by any other flag (O_NONBLOCK for instance).
So default sysdeps/posix implementations fails with EOPNOTSUPP for any non
supported flag (which are none currently) calls generic preadv/pwritev.
Basically this implementation supports only preadv2 called as preadv (with
flags sets to 0).
The Linux one uses the preadv2/pwritev2 syscall if defined, otherwise it
call preadv/writev. Instead of using the previous __ASSUME_* to
unconditionally issue the syscall (and avoid building the fallback routine),
it call pread/write if the preadv2/pwritev2 syscalls fails. The idea
is just avoid adding another __ASSUME_* and checking each architecture
on every kernel bump and simplify code conditionals.
Checked on x86_64-linux-gnu and on i686-linux-gnu and a check with
run-built-tests=no on aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabihf,
ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu, mips{64,64n32}-linux-gnu,
nios2-linux-gnu, powerpc{64,64le}-linux-gnu, s390{x}-linux-gnu,
sparc{64,v9}-linux-gnu, tile{gx,pro}-linux-gnu, and sh4-linux-gnu (all using
gcc 6.3).
* NEWS: Add note about pwritev2 and preadv2 inclusion.
* misc/Makefile (routines): Add preadv2, preadv64v2, pwritev2, and
pwritev64v2.
(tests): Add tst-preadvwritev2 and tst-preadvwritev64v2.
* misc/Versions (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, and
pwritev64v2.
* misc/preadv2.c: New file.
* misc/preadv64v2.c: Likewise.
* misc/pwritev2.c: Likewise.
* misc/pwritev64v2.c: Likewise.
* misc/tst-preadvwritev2.c: Likewise.
* misc/tst-preadvwritev64v2.c: Likewise.
* manual/llio.texi: Add preadv2 and pwritev2 documentation.
* misc/sys/uio.h [__USE_GNU && !__USE_FILE_OFFSET64] (preadv2): New
prototype.
[__USE_GNU && !__USE_FILE_OFFSET64] (pwritev2): Likewise.
[__USE_GNU && __USE_FILE_OFFSET64] (preadv64v2): Likewise.
[__USE_GNU && __USE_FILE_OFFSET64] (pwritev64v2): Likewise.
* misc/tst-preadvwritev-common.c (PREADV): Define if not defined.
(PWRITEV): Likewise.
(do_test_with_offset): Use PREADV and PWRITEV macros and check for
ENOSYS.
* nptl/tst-cancel4.c (tf_pwritev2): New test.
(tf_preadv2): Likewise.
(tf_fsync): Add tf_pwritev2 and tf_preadv2.
* sysdeps/posix/preadv2.c: Likewise.
* sysdeps/posix/preadv64v2.c: Likewise.
* sysdeps/posix/pwritev2.c: Likewise.
* sysdeps/posix/pwritev64v2.c: Likewise.
* sysdeps/unix/sysv/linux/kernel-features.h: Add comment for syscall
support in kernel.
* sysdeps/unix/sysv/linux/preadv2.c: Likewise.
* sysdeps/unix/sysv/linux/preadv64v2.c: Likewise.
* sysdeps/unix/sysv/linux/pwritev2.c: Likewise.
* sysdeps/unix/sysv/linux/pwritev64v2.c: Likewise.
* sysdeps/unix/sysv/linux/preadv.c (preadv): Add libc_hidden_def.
* 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/bits/uio.h: Add supported preadv2/pwritev2
support flags on Linux.
* sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.26): Add
preadv2, preadv64v2, pwritev2, pwritev64v2.
* sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
(GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
(GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
(GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.26): Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/sysv/linux/tile/tilegx/tilegx32/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/sysv/linux/tile/tilegx/tilegx64/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.26):
Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.26):
Likewise.
|
||
|---|---|---|
| .. | ||
| bits | ||
| sys | ||
| acct.c | ||
| ar.h | ||
| brk.c | ||
| bug18240.c | ||
| bug-hsearch1.c | ||
| chflags.c | ||
| chroot.c | ||
| daemon.c | ||
| dirname.c | ||
| efgcvt_r.c | ||
| efgcvt.c | ||
| err.c | ||
| err.h | ||
| error.c | ||
| error.h | ||
| fchflags.c | ||
| fdatasync.c | ||
| fgetxattr.c | ||
| flistxattr.c | ||
| fremovexattr.c | ||
| fsetxattr.c | ||
| fstab.c | ||
| fstab.h | ||
| fsync.c | ||
| ftruncate64.c | ||
| ftruncate.c | ||
| futimes.c | ||
| futimesat.c | ||
| getauxval.c | ||
| getclktck.c | ||
| getdomain.c | ||
| getdtsz.c | ||
| gethostid.c | ||
| gethostname.c | ||
| getloadavg.c | ||
| getpagesize.c | ||
| getpass.c | ||
| getsysstats.c | ||
| getttyent.c | ||
| getusershell.c | ||
| getxattr.c | ||
| gtty.c | ||
| hsearch_r.c | ||
| hsearch.c | ||
| ifunc-impl-list.c | ||
| init-misc.c | ||
| insremque.c | ||
| ioctl.c | ||
| lgetxattr.c | ||
| libgen.h | ||
| listxattr.c | ||
| llistxattr.c | ||
| lremovexattr.c | ||
| lsearch.c | ||
| lsetxattr.c | ||
| lutimes.c | ||
| madvise.c | ||
| makedev.c | ||
| Makefile | ||
| mincore.c | ||
| mkdtemp.c | ||
| mkostemp64.c | ||
| mkostemp.c | ||
| mkostemps64.c | ||
| mkostemps.c | ||
| mkstemp64.c | ||
| mkstemp.c | ||
| mkstemps64.c | ||
| mkstemps.c | ||
| mktemp.c | ||
| mlock.c | ||
| mlockall.c | ||
| mmap64.c | ||
| mmap.c | ||
| mntent_r.c | ||
| mntent.c | ||
| mntent.h | ||
| mprotect.c | ||
| msync.c | ||
| munlock.c | ||
| munlockall.c | ||
| munmap.c | ||
| preadv2.c | ||
| preadv64.c | ||
| preadv64v2.c | ||
| preadv.c | ||
| pselect.c | ||
| ptrace.c | ||
| pwritev2.c | ||
| pwritev64.c | ||
| pwritev64v2.c | ||
| pwritev.c | ||
| qefgcvt_r.c | ||
| qefgcvt.c | ||
| readv.c | ||
| reboot.c | ||
| regexp.c | ||
| regexp.h | ||
| remap_file_pages.c | ||
| removexattr.c | ||
| revoke.c | ||
| sbrk.c | ||
| search.h | ||
| select.c | ||
| setdomain.c | ||
| setegid.c | ||
| seteuid.c | ||
| sethostid.c | ||
| sethostname.c | ||
| setregid.c | ||
| setreuid.c | ||
| setxattr.c | ||
| sgtty.h | ||
| sstk.c | ||
| stab.h | ||
| stty.c | ||
| swapoff.c | ||
| swapon.c | ||
| sync.c | ||
| syncfs.c | ||
| syscall.c | ||
| syscall.h | ||
| sysexits.h | ||
| syslog.c | ||
| syslog.h | ||
| truncate64.c | ||
| truncate.c | ||
| tsearch.c | ||
| tst-atomic-long.c | ||
| tst-atomic.c | ||
| tst-dirname.c | ||
| tst-efgcvt.c | ||
| tst-empty.c | ||
| tst-error1.c | ||
| tst-fdset.c | ||
| tst-hsearch.c | ||
| tst-insremque.c | ||
| tst-makedev.c | ||
| tst-mntent2.c | ||
| tst-mntent-blank-corrupt.c | ||
| tst-mntent-blank-passno.c | ||
| tst-mntent.c | ||
| tst-preadvwritev2.c | ||
| tst-preadvwritev64.c | ||
| tst-preadvwritev64v2.c | ||
| tst-preadvwritev-common.c | ||
| tst-preadvwritev.c | ||
| tst-pselect.c | ||
| tst-tsearch.c | ||
| ttyent.h | ||
| ttyslot.c | ||
| ualarm.c | ||
| usleep.c | ||
| ustat.c | ||
| ustat.h | ||
| utimes.c | ||
| Versions | ||
| vhangup.c | ||
| writev.c | ||