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

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, or some part of the region being unmapped is outside the valid address range for a process.

SEE ALSO

madvise(2), mincore(2), mlock(2), mmap(2), mprotect(2), msync(2), getpagesize(3)

STANDARDS

The munmap() function conforms to IEEE Std 1003.1b-1993 (“POSIX.1b”).

HISTORY

The munmap() function first appeared in 4.4BSD.