mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-25 08:48:55 +08:00
b9256371fa
0
* configure.in: Check for unistd.h as well.
* configure: Rebuild.
* config.in: Rebuild.
* getpagesize.c (GNU_OUR_PAGESIZE): Use sysconf only if _SC_PAGESIZE
is defined in unistd.h. Reformat conditional block for easier reading.
* config.table (shared): Default to no if ${enable_shared}
is unset or empty; this logic is used by the toplevel
configure scripts, too.
From-SVN: r19924
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/* Emulation of getpagesize() for systems that need it. */
|
|
|
|
/*
|
|
|
|
NAME
|
|
|
|
getpagesize -- return the number of bytes in page of memory
|
|
|
|
SYNOPSIS
|
|
|
|
int getpagesize (void)
|
|
|
|
DESCRIPTION
|
|
|
|
Returns the number of bytes in a page of memory. This is the
|
|
granularity of many of the system memory management routines.
|
|
No guarantee is made as to whether or not it is the same as the
|
|
basic memory management hardware page size.
|
|
|
|
BUGS
|
|
|
|
Is intended as a reasonable replacement for systems where this
|
|
is not provided as a system call. The value of 4096 may or may
|
|
not be correct for the systems where it is returned as the default
|
|
value.
|
|
|
|
*/
|
|
|
|
#ifndef VMS
|
|
|
|
#include "config.h"
|
|
|
|
#include <sys/types.h>
|
|
#ifdef HAVE_SYS_PARAM_H
|
|
#include <sys/param.h>
|
|
#endif
|
|
|
|
#undef GNU_OUR_PAGESIZE
|
|
#if defined (HAVE_SYSCONF) && defined (HAVE_UNISTD_H)
|
|
#include <unistd.h>
|
|
#ifdef _SC_PAGESIZE
|
|
#define GNU_OUR_PAGESIZE sysconf(_SC_PAGESIZE)
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef GNU_OUR_PAGESIZE
|
|
# ifdef PAGESIZE
|
|
# define GNU_OUR_PAGESIZE PAGESIZE
|
|
# else /* no PAGESIZE */
|
|
# ifdef EXEC_PAGESIZE
|
|
# define GNU_OUR_PAGESIZE EXEC_PAGESIZE
|
|
# else /* no EXEC_PAGESIZE */
|
|
# ifdef NBPG
|
|
# define GNU_OUR_PAGESIZE (NBPG * CLSIZE)
|
|
# ifndef CLSIZE
|
|
# define CLSIZE 1
|
|
# endif /* CLSIZE */
|
|
# else /* no NBPG */
|
|
# ifdef NBPC
|
|
# define GNU_OUR_PAGESIZE NBPC
|
|
# else /* no NBPC */
|
|
# define GNU_OUR_PAGESIZE 4096 /* Just punt and use reasonable value */
|
|
# endif /* NBPC */
|
|
# endif /* NBPG */
|
|
# endif /* EXEC_PAGESIZE */
|
|
# endif /* PAGESIZE */
|
|
#endif /* GNU_OUR_PAGESIZE */
|
|
|
|
int
|
|
getpagesize ()
|
|
{
|
|
return (GNU_OUR_PAGESIZE);
|
|
}
|
|
|
|
#else /* VMS */
|
|
|
|
#if 0 /* older distributions of gcc-vms are missing <syidef.h> */
|
|
#include <syidef.h>
|
|
#endif
|
|
#ifndef SYI$_PAGE_SIZE /* VMS V5.4 and earlier didn't have this yet */
|
|
#define SYI$_PAGE_SIZE 4452
|
|
#endif
|
|
extern unsigned long lib$getsyi(const unsigned short *,...);
|
|
|
|
int getpagesize ()
|
|
{
|
|
long pagsiz = 0L;
|
|
unsigned short itmcod = SYI$_PAGE_SIZE;
|
|
|
|
(void) lib$getsyi (&itmcod, (void *) &pagsiz);
|
|
if (pagsiz == 0L)
|
|
pagsiz = 512L; /* VAX default */
|
|
return (int) pagsiz;
|
|
}
|
|
|
|
#endif /* VMS */
|