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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /libiberty/getpagesize.c
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Diffstat (limited to 'libiberty/getpagesize.c')
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diff --git a/libiberty/getpagesize.c b/libiberty/getpagesize.c
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+/* 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 */