lib/mmap.c File Reference

function to mmap a file More...

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

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

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Detailed Description

function to mmap a file

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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	(	const char *	fname,
		off_t *	len,
		int *	fd
	)

map a file into memory

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

Parameters:

fname	path to file to map
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)