NAME

munmap − unmap pages of memory

SYNOPSIS

#include <sys/types.h>
#include <sys/mman.h>
int munmap(caddr_t addr, size_t len);

DESCRIPTION

The function 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. 

The function mmap often performs an implicit munmap. 

RETURN VALUE

Upon successful completion, the function munmap returns a value of 0; otherwise, it returns a value of −1 and sets errno to indicate an error. 

ERRORS

Under the following conditions, the function munmap fails and sets errno to:

EINVAL if addr is not a multiple of the page size as returned by ­sysconf. 

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

EINVAL The argument len has a value less than or equal to 0. 

SEE ALSO

mmap(2), sysconf(3C)