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.