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Chet Ramey
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
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* getpagesize - print the system pagesize
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*
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* Chet Ramey
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* chet@ins.cwru.edu
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*/
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#include <stdio.h>
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/*
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* I know these systems have getpagesize(2)
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*/
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#if defined (Bsd) || defined (Ultrix) || defined (sun)
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# define HAVE_GETPAGESIZE
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#endif
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#if !defined (HAVE_GETPAGESIZE)
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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# if defined (_SC_PAGESIZE)
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# define getpagesize() sysconf(_SC_PAGESIZE)
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# endif /* _SC_PAGESIZE */
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#endif
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#if !defined (getpagesize)
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# include <sys/param.h>
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# if defined (PAGESIZE)
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# define getpagesize() PAGESIZE
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# else /* !PAGESIZE */
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# if defined (EXEC_PAGESIZE)
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# define getpagesize() EXEC_PAGESIZE
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# else /* !EXEC_PAGESIZE */
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# if defined (NBPG)
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# if !defined (CLSIZE)
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# define CLSIZE 1
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# endif /* !CLSIZE */
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# define getpagesize() (NBPG * CLSIZE)
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# else /* !NBPG */
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# if defined (NBPC)
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# define getpagesize() NBPC
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# endif /* NBPC */
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# endif /* !NBPG */
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# endif /* !EXEC_PAGESIZE */
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# endif /* !PAGESIZE */
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#endif /* !getpagesize */
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#if !defined (getpagesize)
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# define getpagesize() 4096 /* Just punt and use reasonable value */
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#endif
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#endif /* no EXEC_PAGESIZE */
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#endif /* not HAVE_GETPAGESIZE */
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main()
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{
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#if defined (HAVE_GETPAGESIZE) || defined (getpagesize)
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printf ("%ld\n", getpagesize ());
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#else
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puts ("1024");
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#endif
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}
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