DragonFly On-Line Manual Pages


MUNMAP(2)		 DragonFly System Calls Manual		     MUNMAP(2)

NAME

munmap -- remove a mapping

LIBRARY

Standard C Library (libc, -lc)

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

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

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

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

HISTORY

The munmap() function first appeared in 4.4BSD. DragonFly 3.9 May 27, 1994 DragonFly 3.9