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 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.
HISTORY
The
munmap() system call first appeared in
4.4BSD.