NAME

munmap − unmap pages of memory. 

SYNOPSIS

#include <sys/mman.h>

int munmap(addr, len)
caddr_t addr;
int len;

DESCRIPTION

munmap() removes the mappings for pages in the range [addr, addr + len). Further references to these pages will result in the delivery of a SIGSEGV signal to the process, unless these pages are considered part of the “data” or “stack” segments. 

brk() and mmap() often perform implicit munmap’s. 

RETURN VALUES

munmap() returns:

0 on success. 

−1 on failure and sets errno to indicate the error. 

ERRORS

EINVAL addr is not a multiple of the page size as returned by getpagesize(2). 

Addresses in the range [addr, addr + len) are outside the valid range for the address space of a process.

SEE ALSO

brk(2), getpagesize(2), mmap(2)

Solbourne Computer, Inc.  —  12 Dec 1990