#include <sys/mman.h>

     int
     munmap(caddr_t addr, size_t len);

DESCRIPTION

     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

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

ERRORS

     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

     getpagesize(3), msync(2), munmap(2), mprotect(2), madvise(2), mincore(2)

HISTORY

     The munmap() function first appeared in 4.4BSD.

BSD                             April 15, 1994                             BSD