69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <stdlib.h>
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#include <sysdep.h>
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#include <sys/uio.h>
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#include "pthreadP.h"
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/* Not all versions of the kernel support extremely large numbers
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of records. */
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#ifndef UIO_FASTIOV
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/* 1024 is what the kernels with NPTL support use. */
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# define UIO_FASTIOV 1024
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#endif
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ssize_t
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readv (fd, vector, count)
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int fd;
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const struct iovec *vector;
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int count;
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{
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int oldtype = CANCEL_ASYNC ();
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ssize_t result;
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#ifdef INTERNAL_SYSCALL
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result = INTERNAL_SYSCALL (readv, 3, fd, vector, count);
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if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result), 0))
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{
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if (count <= UIO_FASTIOV)
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{
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__set_errno (INTERNAL_SYSCALL_ERRNO (result));
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result = -1;
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}
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else
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result = __libc_readv (fd, vector, count);
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}
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#else
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# if defined INLINE_SYSCALL
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result = INLINE_SYSCALL (readv, 3, fd, vector, count);
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if (result < 0 && errno == EINVAL
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&& __builtin_expect (count > UIO_FASTIOV, 0))
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# endif
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result = __libc_readv (fd, vector, count);
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#endif
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CANCEL_RESET (oldtype);
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return result;
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}
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