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MUNMAP(2)                   BSD System Calls Manual                  MUNMAP(2)

NAME
     munmap -- remove a mapping

SYNOPSIS
     #include <&lt;sys/mman.h>&gt;

     int
     munmap(void *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, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     munmap() will fail if:

     [EINVAL]           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.

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

HISTORY
     The munmap() system call first appeared in 4.1cBSD.

BSD                             April 29, 2017                             BSD