/* Copyright (C) 1991-2018 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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#ifndef _SYS_UIO_H

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#define _SYS_UIO_H 1

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#include <features.h>

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#include <sys/types.h>

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#include <bits/types/struct_iovec.h>

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#include <bits/uio_lim.h>

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#ifdef __IOV_MAX

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# define UIO_MAXIOV __IOV_MAX

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#else

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# undef UIO_MAXIOV

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#endif

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__BEGIN_DECLS

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/* Read data from file descriptor FD, and put the result in the

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buffers described by IOVEC, which is a vector of COUNT 'struct iovec's.

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The buffers are filled in the order specified.

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Operates just like 'read' (see <unistd.h>) except that data are

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put in IOVEC instead of a contiguous buffer.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count)

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__wur;

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/* Write data pointed by the buffers described by IOVEC, which

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is a vector of COUNT 'struct iovec's, to file descriptor FD.

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The data is written in the order specified.

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Operates just like 'write' (see <unistd.h>) except that the data

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are taken from IOVEC instead of a contiguous buffer.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count)

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__wur;

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#ifdef __USE_MISC

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# ifndef __USE_FILE_OFFSET64

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/* Read data from file descriptor FD at the given position OFFSET

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without change the file pointer, and put the result in the buffers

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described by IOVEC, which is a vector of COUNT 'struct iovec's.

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The buffers are filled in the order specified. Operates just like

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'pread' (see <unistd.h>) except that data are put in IOVEC instead

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of a contiguous buffer.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,

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__off_t __offset) __wur;

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/* Write data pointed by the buffers described by IOVEC, which is a

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vector of COUNT 'struct iovec's, to file descriptor FD at the given

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position OFFSET without change the file pointer. The data is

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written in the order specified. Operates just like 'pwrite' (see

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<unistd.h>) except that the data are taken from IOVEC instead of a

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contiguous buffer.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,

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__off_t __offset) __wur;

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# else

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# ifdef __REDIRECT

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extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec,

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int __count, __off64_t __offset),

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preadv64) __wur;

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extern ssize_t __REDIRECT (pwritev, (int __fd, const struct iovec *__iovec,

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int __count, __off64_t __offset),

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pwritev64) __wur;

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# else

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# define preadv preadv64

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# define pwritev pwritev64

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# endif

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# endif

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# ifdef __USE_LARGEFILE64

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/* Read data from file descriptor FD at the given position OFFSET

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without change the file pointer, and put the result in the buffers

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described by IOVEC, which is a vector of COUNT 'struct iovec's.

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The buffers are filled in the order specified. Operates just like

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'pread' (see <unistd.h>) except that data are put in IOVEC instead

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of a contiguous buffer.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t preadv64 (int __fd, const struct iovec *__iovec, int __count,

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__off64_t __offset) __wur;

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/* Write data pointed by the buffers described by IOVEC, which is a

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vector of COUNT 'struct iovec's, to file descriptor FD at the given

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position OFFSET without change the file pointer. The data is

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written in the order specified. Operates just like 'pwrite' (see

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<unistd.h>) except that the data are taken from IOVEC instead of a

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contiguous buffer.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count,

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__off64_t __offset) __wur;

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# endif

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#endif /* Use misc. */

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#ifdef __USE_GNU

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# ifndef __USE_FILE_OFFSET64

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/* Same as preadv but with an additional flag argumenti defined at uio.h. */

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extern ssize_t preadv2 (int __fp, const struct iovec *__iovec, int __count,

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__off_t __offset, int ___flags) __wur;

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/* Same as preadv but with an additional flag argument defined at uio.h. */

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extern ssize_t pwritev2 (int __fd, const struct iovec *__iodev, int __count,

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__off_t __offset, int __flags) __wur;

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# else

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# ifdef __REDIRECT

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extern ssize_t __REDIRECT (pwritev2, (int __fd, const struct iovec *__iovec,

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int __count, __off64_t __offset,

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int __flags),

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pwritev64v2) __wur;

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extern ssize_t __REDIRECT (preadv2, (int __fd, const struct iovec *__iovec,

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int __count, __off64_t __offset,

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int __flags),

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preadv64v2) __wur;

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# else

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# define preadv2 preadv64v2

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# define pwritev2 pwritev64v2

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# endif

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# endif

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# ifdef __USE_LARGEFILE64

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/* Same as preadv but with an additional flag argumenti defined at uio.h. */

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extern ssize_t preadv64v2 (int __fp, const struct iovec *__iovec,

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int __count, __off64_t __offset,

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int ___flags) __wur;

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/* Same as preadv but with an additional flag argument defined at uio.h. */

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extern ssize_t pwritev64v2 (int __fd, const struct iovec *__iodev,

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int __count, __off64_t __offset,

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int __flags) __wur;

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# endif

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#endif /* Use GNU. */

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__END_DECLS

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/* Some operating systems provide system-specific extensions to this

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header. */

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#ifdef __USE_GNU

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# include <bits/uio-ext.h>

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#endif

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#endif /* sys/uio.h */

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