XSI_DEVICE_IO

XSI Device Input and Output option group. More...

Files
file	uio.h
	POSIX scatter/gather I/O types (<sys/uio.h>)

Functions
ssize_t	readv (int fildes, const struct iovec *iov, int iovcnt)
	Read data into multiple buffers (scatter input).
ssize_t	writev (int fildes, const struct iovec *iov, int iovcnt)
	Write data from multiple buffers (gather output).

Detailed Description

XSI Device Input and Output option group.

Covers readv(), writev(), and fmtmsg().

See also

https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_subprofiles.html

Function Documentation

readv()

ssize_t readv	(	int	fildes,
		const struct iovec *	iov,
		int	iovcnt
	)

Read data into multiple buffers (scatter input).

Parameters

fildes	Open file descriptor.
iov	Array of buffers to fill.
iovcnt	Number of elements in iov.

Returns

Number of bytes read on success, or -1 with errno set on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/readv.html

writev()

ssize_t writev	(	int	fildes,
		const struct iovec *	iov,
		int	iovcnt
	)

Write data from multiple buffers (gather output).

Parameters

fildes	Open file descriptor.
iov	Array of buffers to write.
iovcnt	Number of elements in iov.

Returns

Number of bytes written on success, or -1 with errno set on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/writev.html