NAME
munmap —
remove a mapping
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/mman.h>
int
munmap(void
*addr, size_t
len);
DESCRIPTION
Themunmap()
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 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.