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      1 /* Some OS-dependent utility code */
      2 
      3 #ifdef HAVE_CONFIG_H
      4 #include <config.h>
      5 #endif
      6 #include <X11/Xosdefs.h>
      7 #include <X11/IntrinsicP.h>
      8 #include "Private.h"
      9 
     10 #ifdef HAVE_UNISTD_H
     11 #include <unistd.h>	/* for sysconf(), and getpagesize() */
     12 #endif
     13 
     14 #if defined(_WIN32) && !defined(__CYGWIN__)
     15 /* AC_CHECK_FUNCS([getpagesize]) may report a false positive for
     16    getpagesize() when using MinGW gcc, since it's present in libgcc.a */
     17 #undef HAVE_GETPAGESIZE
     18 #endif
     19 
     20 #if defined(linux)
     21 /* kernel header doesn't work with -ansi */
     22 /* #include <asm/page.h> *//* for PAGE_SIZE */
     23 #define HAS_SC_PAGESIZE	/* _SC_PAGESIZE may be an enum for Linux */
     24 #endif
     25 
     26 int
     27 _XawGetPageSize(void)
     28 {
     29     static int pagesize = -1;
     30 
     31     if (pagesize != -1)
     32 	return pagesize;
     33 
     34     /* Try each supported method in the preferred order */
     35 
     36 #if defined(_SC_PAGESIZE) || defined(HAS_SC_PAGESIZE)
     37     pagesize = (int) sysconf(_SC_PAGESIZE);
     38 #endif
     39 
     40 #ifdef _SC_PAGE_SIZE
     41     if (pagesize == -1)
     42 	pagesize = (int) sysconf(_SC_PAGE_SIZE);
     43 #endif
     44 
     45 #ifdef HAVE_GETPAGESIZE
     46     if (pagesize == -1)
     47 	pagesize = getpagesize();
     48 #endif
     49 
     50 #ifdef PAGE_SIZE
     51     if (pagesize == -1)
     52 	pagesize = PAGE_SIZE;
     53 #endif
     54 
     55     if (pagesize == -1)
     56 	pagesize = 0;
     57 
     58     return pagesize;
     59 }
     60