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95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* Copyright (C) 2009, 2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stddef.h>
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#include <sys/param.h>
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#if __WORDSIZE == 64
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/* Hide the preadv64 declaration. */
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# define preadv64 __redirect_preadv64
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#endif
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#include <sys/uio.h>
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#include <sysdep-cancel.h>
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#include <sys/syscall.h>
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#include <kernel-features.h>
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#ifndef PREADV
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# define PREADV preadv
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# define PREADV_REPLACEMENT __atomic_preadv_replacement
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# define PREAD __pread
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# define OFF_T off_t
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#endif
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#define LO_HI_LONG(val) \
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(off_t) val, \
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(off_t) ((((uint64_t) (val)) >> (sizeof (long) * 4)) >> (sizeof (long) * 4))
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#ifndef __ASSUME_PREADV
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static ssize_t PREADV_REPLACEMENT (int, const struct iovec *,
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int, OFF_T) internal_function;
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#endif
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ssize_t
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PREADV (fd, vector, count, offset)
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int fd;
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const struct iovec *vector;
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int count;
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OFF_T offset;
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{
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#ifdef __NR_preadv
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ssize_t result;
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if (SINGLE_THREAD_P)
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result = INLINE_SYSCALL (preadv, 5, fd, vector, count,
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LO_HI_LONG (offset));
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else
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{
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int oldtype = LIBC_CANCEL_ASYNC ();
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result = INLINE_SYSCALL (preadv, 5, fd, vector, count,
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LO_HI_LONG (offset));
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LIBC_CANCEL_RESET (oldtype);
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}
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# ifdef __ASSUME_PREADV
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return result;
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# endif
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#endif
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#ifndef __ASSUME_PREADV
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# ifdef __NR_preadv
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if (result >= 0 || errno != ENOSYS)
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return result;
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# endif
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return PREADV_REPLACEMENT (fd, vector, count, offset);
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#endif
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}
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#if __WORDSIZE == 64
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# undef preadv64
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strong_alias (preadv, preadv64)
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#endif
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#ifndef __ASSUME_PREADV
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# undef PREADV
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# define PREADV static internal_function PREADV_REPLACEMENT
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# include <sysdeps/posix/preadv.c>
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#endif
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