munmap(2) - NetBSD Manual Pages

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MUNMAP(2)                 NetBSD Programmer's Manual                 MUNMAP(2)


NAME

     munmap - remove a mapping


SYNOPSIS

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

     int
     munmap(void *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

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


HISTORY

     The munmap() function first appeared in 4.4BSD.

4.4BSD                          April 15, 1994                               1