Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@14877 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 89 insertions, 0 deletions

diff --git a/libiberty/getpagesize.c b/libiberty/getpagesize.c
new file mode 100644
index 00000000000..e9784b8520b
--- /dev/null
+++ b/libiberty/getpagesize.c
@@ -0,0 +1,89 @@
+/* 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 <sys/types.h>
+#ifndef NO_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#ifdef HAVE_SYSCONF
+#include <unistd.h>
+#define GNU_OUR_PAGESIZE sysconf(_SC_PAGESIZE)
+#else
+#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 /* HAVE_SYSCONF */
+
+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 */