MUNMAP(2FREEBSD) - man page online | system calls

MUNMAP(2)                            BSD 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
     The munmap() function returns the value 0 if successful; otherwise the value -1 is returned
     and the global variable errno is set to indicate the error.

ERRORS
     The munmap() system call will fail if:

     [EINVAL]           The addr argument was not page aligned, the len argument was zero or neg‐
                        ative, or some part of the region being unmapped is outside the valid
                        address range for a process.

SEE ALSO
     madvise(2), mincore(2), mmap(2), mprotect(2), msync(2), getpagesize(3)

HISTORY
     The munmap() system call first appeared in 4.4BSD.

BSD                                        May 27, 1994                                       BSD