NAME¶
mmap_private - memory map a file for reading and writing
SYNTAX¶
#include <mmap.h>
char*
mmap_private(const char*
filename,size_t*
filesize);
DESCRIPTION¶
mmap_private opens
filename for reading and writing, maps the whole file
into memory, closes the file, writes the length of the file to
filesize
and returns a pointer to the mapped file.
The file is mapped copy-on-write. Changes done to the mapped region will not be
written to disk.
The file is unmapped by the operating system if the process terminates. It can
also be manually unmapped by calling
munmap from <sys/mman.h>.
If the file could not be opened or mapped, (void*)0 is returned.
SEE ALSO¶
mmap_unmap(3)