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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#pragma once
/**
* @file sys/uio.h
* @brief Multi-buffer ("vector") I/O operations using `struct iovec`.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <linux/uio.h>
__BEGIN_DECLS
/**
* [readv(2)](http://man7.org/linux/man-pages/man2/readv.2.html) reads
* from an fd into the `__count` buffers described by `__iov`.
*
* Returns the number of bytes read on success,
* and returns -1 and sets `errno` on failure.
*/
ssize_t readv(int __fd, const struct iovec* __iov, int __count);
/**
* [writev(2)](http://man7.org/linux/man-pages/man2/writev.2.html) writes
* to an fd from the `__count` buffers described by `__iov`.
*
* Returns the number of bytes written on success,
* and returns -1 and sets `errno` on failure.
*/
ssize_t writev(int __fd, const struct iovec* __iov, int __count);
#if defined(__USE_GNU)
/**
* [preadv(2)](http://man7.org/linux/man-pages/man2/preadv.2.html) reads
* from an fd into the `__count` buffers described by `__iov`, starting at
* offset `__offset` into the file.
*
* Returns the number of bytes read on success,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 24.
*/
ssize_t preadv(int __fd, const struct iovec* __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(preadv64) __INTRODUCED_IN(24);
/**
* [pwritev(2)](http://man7.org/linux/man-pages/man2/pwritev.2.html) writes
* to an fd from the `__count` buffers described by `__iov`, starting at offset
* `__offset` into the file.
*
* Returns the number of bytes written on success,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 24.
*/
ssize_t pwritev(int __fd, const struct iovec* __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(pwritev64) __INTRODUCED_IN(24);
/**
* Like preadv() but with a 64-bit offset even in a 32-bit process.
*
* Available since API level 24.
*/
ssize_t preadv64(int __fd, const struct iovec* __iov, int __count, off64_t __offset) __INTRODUCED_IN(24);
/**
* Like pwritev() but with a 64-bit offset even in a 32-bit process.
*
* Available since API level 24.
*/
ssize_t pwritev64(int __fd, const struct iovec* __iov, int __count, off64_t __offset) __INTRODUCED_IN(24);
/**
* [preadv2(2)](http://man7.org/linux/man-pages/man2/preadv2.2.html) reads
* from an fd into the `__count` buffers described by `__iov`, starting at
* offset `__offset` into the file, with the given flags.
*
* Returns the number of bytes read on success,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 33.
*/
ssize_t preadv2(int __fd, const struct iovec* __iov, int __count, off_t __offset, int __flags) __RENAME_IF_FILE_OFFSET64(preadv64v2) __INTRODUCED_IN(33);
/**
* [pwritev2(2)](http://man7.org/linux/man-pages/man2/pwritev2.2.html) writes
* to an fd from the `__count` buffers described by `__iov`, starting at offset
* `__offset` into the file, with the given flags.
*
* Returns the number of bytes written on success,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 33.
*/
ssize_t pwritev2(int __fd, const struct iovec* __iov, int __count, off_t __offset, int __flags) __RENAME_IF_FILE_OFFSET64(pwritev64v2) __INTRODUCED_IN(33);
/**
* Like preadv2() but with a 64-bit offset even in a 32-bit process.
*
* Available since API level 33.
*/
ssize_t preadv64v2(int __fd, const struct iovec* __iov, int __count, off64_t __offset, int __flags) __INTRODUCED_IN(33);
/**
* Like pwritev2() but with a 64-bit offset even in a 32-bit process.
*
* Available since API level 33.
*/
ssize_t pwritev64v2(int __fd, const struct iovec* __iov, int __count, off64_t __offset, int __flags) __INTRODUCED_IN(33);
/**
* [process_vm_readv(2)](http://man7.org/linux/man-pages/man2/process_vm_readv.2.html)
* reads from the address space of another process.
*
* Returns the number of bytes read on success,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 23.
*/
ssize_t process_vm_readv(pid_t __pid, const struct iovec* __local_iov, unsigned long __local_iov_count, const struct iovec* __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23);
/**
* [process_vm_writev(2)](http://man7.org/linux/man-pages/man2/process_vm_writev.2.html)
* writes to the address space of another process.
*
* Returns the number of bytes read on success,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 23.
*/
ssize_t process_vm_writev(pid_t __pid, const struct iovec* __local_iov, unsigned long __local_iov_count, const struct iovec* __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23);
#endif
__END_DECLS
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