glibc/sysdeps/unix/sysv/linux/preadv64v2.c
Florian Weimer b5350b487c Linux: Clean up preadv2, pwritev2 system call names
With the built-in tables __NR_preadv2 and __NR_pwritev2 are always
defined.

The kernel has never defined __NR_preadv64v2 and __NR_pwritev64v2
and is unlikely to do so, given that the preadv2 and pwritev2 system
calls themselves are 64-bit.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-03-03 12:18:22 +01:00

55 lines
1.8 KiB
C

/* Linux implementation of preadv2 (LFS version).
Copyright (C) 2017-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/uio.h>
#include <sysdep-cancel.h>
ssize_t
preadv64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
int flags)
{
ssize_t result = SYSCALL_CANCEL (preadv2, fd, vector, count,
LO_HI_LONG (offset), flags);
if (result >= 0 || errno != ENOSYS)
return result;
/* Trying to emulate the preadv2 syscall 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). */
if (flags != 0)
{
__set_errno (ENOTSUP);
return -1;
}
if (offset == -1)
return __readv (fd, vector, count);
else
return preadv64 (fd, vector, count, offset);
}
#ifdef __OFF_T_MATCHES_OFF64_T
strong_alias (preadv64v2, preadv2)
#endif