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Command: munmap | Section: 2 | Source: FreeBSD | File: munmap.2.gz
MUNMAP(2) FreeBSD 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 and guards 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 len argument was zero, 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.
FreeBSD 14.1-RELEASE-p8 January 15, 2025 FreeBSD 14.1-RELEASE-p8