io: igt-gpu-tools Reference Manual

io

io — Helpers for file I/O

ssize_t	igt_readn ()
ssize_t	igt_writen ()

#include <igt_io.h>

This library provides helpers for file I/O

ssize_t
igt_readn (int fd,
           char *buf,
           size_t len);

Read from fd into provided buffer until the buffer is full or EOF

fd	the file descriptor
buf	buffer where the contents will be stored, allocated by the caller
size	size of the buffer

-errno on failure or bytes read on success

ssize_t
igt_writen (int fd,
            const char *buf,
            size_t len);

This writes len bytes from data to the sysfs file.

fd	the file descriptor
buf	the block with the contents to write
len	the length to write

-errno on failure or bytes written on success