mmap.c File Reference

function to mmap a file More...

#include <mmap.h>
#include <log.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <syslog.h>

Functions
void *	mmap_fd (int fd, off_t *len)
	map an already opened file into memory More...
void *	mmap_name (int dirfd, const char *fname, off_t *len, int *fd)
	map a file into memory More...

Detailed Description

function to mmap a file

Function Documentation

void* mmap_fd	(	int	fd,
		off_t *	len
	)

map an already opened file into memory

Parameters

fd	file descriptor of opened file
len	length of mapping will be stored here

Returns

pointer to mapped area

Return values

NULL	an error occured (errno is set) or file is empty (errno is 0)

void* mmap_name	(	int	dirfd,
		const char *	fname,
		off_t *	len,
		int *	fd
	)

map a file into memory

Parameters

dirfd	descriptor of directory
fname	path to file to map relative to dirfd
len	length of mapping will be stored here
fd	file descriptor of opened file will be stored here

Returns

pointer to mapped area

Return values

NULL	an error occured (errno is set)

The file is flock()'ed to allow atomic modification of this file.