64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
#include <limits.h>
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#ifdef __unix__ /* ??? Is that good enough? */
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifndef MAP_ANON
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#ifdef MAP_ANONYMOUS
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#define MAP_ANON MAP_ANONYMOUS
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#else
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#define MAP_ANON MAP_FILE
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#endif
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#endif
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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#ifndef MAP_FIXED
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#define MAP_FIXED 0
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#endif
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#endif
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#define MAP_START (void *)0x7fff8000
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#define MAP_LEN 0x10000
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#define OFFSET (MAP_LEN/2 - 2 * sizeof (char));
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f (int s, char *p)
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{
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int i;
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for (i = s; &p[i] < &p[40] && i >= 0; i++)
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{
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p[i] = -2;
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}
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}
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main ()
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{
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#ifdef MAP_ANON
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char *p;
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int dev_zero;
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dev_zero = open ("/dev/zero", O_RDONLY);
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/* -1 is OK when we have MAP_ANON; else mmap will flag an error. */
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if (INT_MAX != 0x7fffffffL || sizeof (char *) != sizeof (int))
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exit (0);
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p = mmap (MAP_START, MAP_LEN, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_FIXED|MAP_PRIVATE, dev_zero, 0);
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if (p != (char *)-1)
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{
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p += OFFSET;
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p[39] = 0;
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f (0, p);
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if (p[39] != (char)-2)
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abort ();
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p[39] = 0;
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f (-1, p);
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if (p[39] != 0)
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abort ();
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}
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#endif
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exit (0);
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}
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