NAME    [Toc]    [Back]

     munmap - remove a mapping

SYNOPSIS    [Toc]    [Back]

     #include <sys/types.h>
     #include <sys/mman.h>

     int
     munmap(void *addr, size_t len);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     Upon successful completion, munmap returns zero.  Otherwise,
a value of
     -1 is returned and errno is set to indicate the error.

ERRORS    [Toc]    [Back]

     munmap() will fail if:

     [EINVAL]       The  addr parameter was not page aligned, the
len parameter
                   was negative, or some part of the region being
unmapped is
                   not part of the currently valid address space.

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The munmap() function first appeared in 4.4BSD.

OpenBSD      3.6                          April      15,     1994