mmap_shared(3)mmap_shared(3)NAMEmmap_shared - memory map a file for reading and writing
SYNTAX
#include <mmap.h>
char* mmap_shared(const char* filename,size_t* filesize);
DESCRIPTIONmmap_shared 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 shared. Changes done to the mapped region are writ‐
ten to disk and are visible to other processes reading from the file or
mapping the same file into memory.
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>.
To write changes to disk immediately, you can use msync from
<sys/mman.h>.
If the file could not be opened or mapped, (void*)0 is returned.
SEE ALSOmmap_unmap(3), msync(2)mmap_shared(3)