Provided by: freebsd-manpages_8.2-1_all
munmap — remove a mapping
Standard C Library (libc, -lc)
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.
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
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.
madvise(2), mincore(2), mmap(2), mprotect(2), msync(2), getpagesize(3)
The munmap() system call first appeared in 4.4BSD.