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Linux/tools/perf/perf-read-vdso.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <stdio.h>
  3 #include <string.h>
  4 
  5 #define VDSO__MAP_NAME "[vdso]"
  6 
  7 /*
  8  * Include definition of find_map() also used in util/vdso.c for
  9  * building perf.
 10  */
 11 #include "util/find-map.c"
 12 
 13 int main(void)
 14 {
 15         void *start, *end;
 16         size_t size, written;
 17 
 18         if (find_map(&start, &end, VDSO__MAP_NAME))
 19                 return 1;
 20 
 21         size = end - start;
 22 
 23         while (size) {
 24                 written = fwrite(start, 1, size, stdout);
 25                 if (!written)
 26                         return 1;
 27                 start += written;
 28                 size -= written;
 29         }
 30 
 31         if (fflush(stdout))
 32                 return 1;
 33 
 34         return 0;
 35 }
 36 

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