MUNMAP(2) NetBSD System Calls Manual MUNMAP(2)
munmap -- remove a mapping
Standard C Library (libc, -lc)
#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, munmap returns zero. Otherwise, a value of -1 is returned and errno is set to indicate the error.
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 outside the valid address range for a process.
madvise(2), mincore(2), mlock(2), mmap(2), mprotect(2), msync(2), getpagesize(3)
The munmap() function first appeared in 4.4BSD. NetBSD 5.0 May 27, 1994 NetBSD 5.0
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