MUNMAP(2)

NAME
munmap - remove a mapping

SYNOPSIS
#include <sys/types.h>
#include <sys/mman.h>
int
munmap(caddr_t addr, size_t len);

DESCRIPTION
The munmap() system call deletes the mappings for the specified address range, and causes further references to addresses within the range to generate invalid memory references.

RETURN VALUES
Upon successful completion, munmap returns zero. Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS
Munmap() will fail if:

[EINVAL]
    The addr parameter was not page aligned, the len parameter was negative, or some part of the region being unmapped is not part of the currently valid address space.

SEE ALSO
getpagesize(3), msync(2), munmap(2), mprotect(2), madvise(2), mincore(2)

HISTORY
The munmap() function first appeared in 4.4BSD.