/*
* 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 ) ] ( https : //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* _Nonnull __iov, int __count);
/**
* [ writev ( 2 ) ] ( https : //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* _Nonnull __iov, int __count);
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(24 )
/**
* [ preadv ( 2 ) ] ( https : //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 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t preadv(int __fd, const struct iovec* _Nonnull __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(preadv64) __INTRODUCED_IN(24 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(24 )
/**
* [ pwritev ( 2 ) ] ( https : //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 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t pwritev(int __fd, const struct iovec* _Nonnull __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(pwritev64) __INTRODUCED_IN(24 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(24 )
/**
* Like preadv ( ) but with a 64 - bit offset even in a 32 - bit process .
*
* Available since API level 24 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t preadv64(int __fd, const struct iovec* _Nonnull __iov, int __count, off64_t __offset) __INTRODUCED_IN(24 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(24 )
/**
* Like pwritev ( ) but with a 64 - bit offset even in a 32 - bit process .
*
* Available since API level 24 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t pwritev64(int __fd, const struct iovec* _Nonnull __iov, int __count, off64_t __offset) __INTRODUCED_IN(24 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(33 )
/**
* [ preadv2 ( 2 ) ] ( https : //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 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t preadv2(int __fd, const struct iovec* _Nonnull __iov, int __count, off_t __offset, int __flags) __RENAME_IF_FILE_OFFSET64(preadv64v2) __INTRODUCED_IN(33 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(33 )
/**
* [ pwritev2 ( 2 ) ] ( https : //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 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t pwritev2(int __fd, const struct iovec* _Nonnull __iov, int __count, off_t __offset, int __flags) __RENAME_IF_FILE_OFFSET64(pwritev64v2) __INTRODUCED_IN(33 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(33 )
/**
* Like preadv2 ( ) but with a 64 - bit offset even in a 32 - bit process .
*
* Available since API level 33 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t preadv64v2(int __fd, const struct iovec* _Nonnull __iov, int __count, off64_t __offset, int __flags) __INTRODUCED_IN(33 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(33 )
/**
* Like pwritev2 ( ) but with a 64 - bit offset even in a 32 - bit process .
*
* Available since API level 33 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t pwritev64v2(int __fd, const struct iovec* _Nonnull __iov, int __count, off64_t __offset, int __flags) __INTRODUCED_IN(33 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(23 )
/**
* [ process_vm_readv ( 2 ) ] ( https : //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 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t process_vm_readv(pid_t __pid, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __local_iov, unsigned long __local_iov_count, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23 );
#endif
#if defined (__USE_GNU) && __BIONIC_AVAILABILITY_GUARD(23 )
/**
* [ process_vm_writev ( 2 ) ] ( https : //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 when compiling with ` _ GNU_SOURCE ` .
*/
ssize_t process_vm_writev(pid_t __pid, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __local_iov, unsigned long __local_iov_count, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23 );
#endif
__END_DECLS
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(vorverarbeitet am 2026-06-28)
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