MUNMAP(2)                 FreeBSD System Calls Manual                MUNMAP(2)

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.

FreeBSD 13.1-RELEASE-p6          June 22, 2017         FreeBSD 13.1-RELEASE-p6