munmap(S)
munmap --
unmap pages of memory
Synopsis
#include <sys/types.h>
#include <sys/mman.h>
int munmap(void *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 values
On success, munmap returns 0.
On failure, munmap returns -1 and sets errno to identify the error.
Errors
In the following conditions, munmap fails and sets errno to:
EINVAL-
addr
is not a multiple of the page size as returned by
sysconf.
EINVAL-
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.
References
mmap(S),
sysconf(S)
Notices
Considerations for threads programming
Sibling threads share (by definition) the same address space;
modifications to the address space by one can be perceived by the others.
© 2005 The SCO Group, Inc. All rights reserved.
SCO OpenServer Release 6.0.0 - 01 June 2005