NAME    [Toc]    [Back]

     munmap - remove a mapping

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #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 outside the valid address range for
                        a process.

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The munmap() function first appeared in 4.4BSD.

BSD                              May 27, 1994                              BSD