munmap(2) - NetBSD Manual Pages

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MUNMAP(2)                 NetBSD 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 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, or some part
                        of the region being unmapped is outside the valid
                        address range for a process.


SEE ALSO

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


STANDARDS

     The munmap() function conforms to IEEE Std 1003.1b-1993 (``POSIX.1'').


HISTORY

     The munmap() function first appeared in 4.4BSD.

NetBSD 9.1                       May 27, 1994                       NetBSD 9.1