Name

munmap - remove a mapping

Synopsis

#include <sys/types.h>
#include <sys/mman.h>

int
munmap(caddr_t 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

Upon successful completion, munmap returns zero. Otherwise, a value of -1 is returned and errno is set to indicate the error.

Errors

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 not part of the currently valid address space.

See Also

getpagesize(3) , msync(2) , munmap(2) , mprotect(2) , madvise(2) , mincore(2)

History

The munmap() function first appeared in 4.4BSD.

Table of Contents

• Name
• Synopsis
• Description
• Return Values
• Errors
• See Also
• History