GETPAGESIZE(3C) Standard C Library Functions GETPAGESIZE(3C)


NAME


getpagesize - get system page size

SYNOPSIS


#include <unistd.h>

int getpagesize(void);


DESCRIPTION


The getpagesize() function returns the number of bytes in a page. Page
granularity is the granularity of many of the memory management calls.


The page size is a system page size and need not be the same as the
underlying hardware page size.


The getpagesize() function is equivalent to sysconf(_SC_PAGE_SIZE) and
sysconf(_SC_PAGESIZE). See sysconf(3C).

RETURN VALUES


The getpagesize() function returns the current page size.

ERRORS


No errors are defined.

USAGE


The value returned by getpagesize() need not be the minimum value that
malloc(3C) can allocate. Moreover, the application cannot assume that an
object of this size can be allocated with malloc().

ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | MT-Safe |
+---------------+-----------------+

SEE ALSO


pagesize(1), brk(2), getrlimit(2), mmap(2), mprotect(2), munmap(2),
malloc(3C), msync(3C), sysconf(3C), attributes(5)


June 27, 2000 GETPAGESIZE(3C)