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FreeBSD 11.0 - man page for munmap (freebsd section 2)

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

NAME
munmap -- remove a mapping
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/mman.h> 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
The munmap() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
The munmap() system call will fail if: [EINVAL] The addr argument was not page aligned, the len argument was zero or negative, or some part of the region being unmapped is outside the valid address range for a process.
SEE ALSO
madvise(2), mincore(2), mmap(2), mprotect(2), msync(2), getpagesize(3)
HISTORY
The munmap() system call first appeared in 4.4BSD.
BSD
May 27, 1994 BSD