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 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.

Debian                                            June 22, 2017                                        MUNMAP(2)