MUNMAP(2) System Calls MUNMAP(2)
NAME
munmap - unmap pages of memory
SYNOPSIS
#include <sys/mman.h>
int munmap(
void *addr,
size_t len);
DESCRIPTION
The
munmap() function removes the mappings for pages in the range
[
addr, addr + len), rounding the
len argument up to the next multiple
of the page size as returned by
sysconf(3C). If
addr is not the
address of a mapping established by a prior call to
mmap(2), the
behavior is undefined. After a successful call to
munmap() and before
any subsequent mapping of the unmapped pages, further references to
these pages will result in the delivery of a
SIGBUS or
SIGSEGV signal
to the process.
The
mmap(2) function often performs an implicit
munmap().
RETURN VALUES
Upon successful completion,
munmap() returns
0; otherwise, it returns
-1 and sets
errno to indicate an error.
ERRORS
The
munmap() function will fail if:
EINVAL The
addr argument is not a multiple of the page size as
returned by
sysconf(3C); addresses in the range [
addr, addr + len) are outside the valid range for the address space of
a process; or the
len argument has a value less than or
equal to
0.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
SEE ALSO
mmap(2),
sysconf(3C),
attributes(7),
standards(7) January 5, 1998 MUNMAP(2)
