musl/include/sys/uio.h

#ifndef _SYS_UIO_H
#define _SYS_UIO_H

#ifdef __cplusplus
extern "C" {
#endif

#include <features.h>

#define __NEED_size_t
#define __NEED_ssize_t
#define __NEED_struct_iovec

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define __NEED_off_t
#endif

#ifdef _GNU_SOURCE
#define __NEED_pid_t
#endif

#include <bits/alltypes.h>

#define UIO_MAXIOV 1024

ssize_t readv (int, const struct iovec *, int);
ssize_t writev (int, const struct iovec *, int);

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
ssize_t preadv (int, const struct iovec *, int, off_t);
ssize_t pwritev (int, const struct iovec *, int, off_t);
#if defined(_LARGEFILE64_SOURCE)
#define preadv64 preadv
#define pwritev64 pwritev
#define off64_t off_t
#endif
#endif

#ifdef _GNU_SOURCE
ssize_t process_vm_writev(pid_t, const struct iovec *, unsigned long, const struct iovec *, unsigned long, unsigned long);
ssize_t process_vm_readv(pid_t, const struct iovec *, unsigned long, const struct iovec *, unsigned long, unsigned long);
ssize_t preadv2 (int, const struct iovec *, int, off_t, int);
ssize_t pwritev2 (int, const struct iovec *, int, off_t, int);
#define RWF_HIPRI 0x00000001
#define RWF_DSYNC 0x00000002
#define RWF_SYNC 0x00000004
#define RWF_NOWAIT 0x00000008
#define RWF_APPEND 0x00000010
#define RWF_NOAPPEND 0x00000020
#endif

#ifdef __cplusplus
}
#endif

#endif