munmap(2)                                                     munmap(2)

  munmap()

  NAME

    munmap() - remove mappings for files in memory

  SYNOPSIS

    #include 

    int munmap (void *addr, size_t len)

  DESCRIPTION

    The munmap(2) function removes a mapping for a file from the range [addr
    addr + len).

    Addr should be a multiple of the page size as given by sysconf(2). The len
    argument is rounded up to the next multiple of the page size.

    Mapped files are automatically unmapped when the process terminates.

  RETURN VALUE

    On success, munmap(2) returns 0. On failure, it returns -1 and sets errno
    to indicate the error.

  ERRORS

    The munmap(2) function can fail if:

    [EINVAL]
        The addr is not a multiple of the page size.
        Addresses in the range [addr addr + len) are not in the valid range
        for a process' address space.
        Len is 0.

  SEE ALSO

    exec(2)

    fcntl(2)

    fork(2)

    mmap(2)

    shmat(2)

    sysconf(2)

  USAGE NOTES

    The munmap function is thread safe.

    The munmap function is not async-signal safe.