read_write.c File Reference

Read and write functions. More...

Functions
ssize_t	sys_read (int fd, void *buf, size_t nbytes)
	Read data from a file descriptor. More...
ssize_t	sys_write (int fd, const void *buf, size_t nbytes)
	Write data into a file descriptor. More...
off_t	sys_lseek (int fd, off_t offset, int whence)
	Repositions the file offset inside a file. More...

Detailed Description

Read and write functions.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

sys_lseek()

off_t sys_lseek	(	int	fd,
		off_t	offset,
		int	whence
	)

Repositions the file offset inside a file.

Parameters

fd	The file descriptor of the file.
offset	The offest to use for the operation.
whence	The type of operation.

Returns

Upon successful completion, returns the resulting offset location as measured in bytes from the beginning of the file. On error, the value (off_t) -1 is returned and errno is set to indicate the error.

sys_read()

ssize_t sys_read	(	int	fd,
		void *	buf,
		size_t	nbytes
	)

Read data from a file descriptor.

Parameters

fd	The file descriptor.
buf	The buffer.
nbytes	The number of bytes to read.

Returns

The number of read characters.

sys_write()

ssize_t sys_write	(	int	fd,
		const void *	buf,
		size_t	nbytes
	)

Write data into a file descriptor.

Parameters

fd	The file descriptor.
buf	The buffer collecting data to written.
nbytes	The number of bytes to write.

Returns

The number of written bytes.