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MUNMAP(2) System Calls Manual MUNMAP(2)

munmap
remove a mapping

#include <sys/mman.h>
int
munmap(void *addr, size_t len);

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.

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

munmap() will fail if:
 
 
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The addr parameter was not page aligned, addr and len specify a region that would extend beyond the end of the address space, or some part of the region being unmapped is not part of the currently valid address space.

madvise(2), mincore(2), mlock(2), mlockall(2), mmap(2), mprotect(2), msync(2), getpagesize(3)

The munmap() system call first appeared in 4.1cBSD.
July 2, 2014 OpenBSD-5.8