xref: /OK3568_Linux_fs/kernel/tools/perf/perf-read-vdso.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <stdio.h>
3*4882a593Smuzhiyun #include <string.h>
4*4882a593Smuzhiyun 
5*4882a593Smuzhiyun #define VDSO__MAP_NAME "[vdso]"
6*4882a593Smuzhiyun 
7*4882a593Smuzhiyun /*
8*4882a593Smuzhiyun  * Include definition of find_map() also used in util/vdso.c for
9*4882a593Smuzhiyun  * building perf.
10*4882a593Smuzhiyun  */
11*4882a593Smuzhiyun #include "util/find-map.c"
12*4882a593Smuzhiyun 
main(void)13*4882a593Smuzhiyun int main(void)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun 	void *start, *end;
16*4882a593Smuzhiyun 	size_t size, written;
17*4882a593Smuzhiyun 
18*4882a593Smuzhiyun 	if (find_map(&start, &end, VDSO__MAP_NAME))
19*4882a593Smuzhiyun 		return 1;
20*4882a593Smuzhiyun 
21*4882a593Smuzhiyun 	size = end - start;
22*4882a593Smuzhiyun 
23*4882a593Smuzhiyun 	while (size) {
24*4882a593Smuzhiyun 		written = fwrite(start, 1, size, stdout);
25*4882a593Smuzhiyun 		if (!written)
26*4882a593Smuzhiyun 			return 1;
27*4882a593Smuzhiyun 		start += written;
28*4882a593Smuzhiyun 		size -= written;
29*4882a593Smuzhiyun 	}
30*4882a593Smuzhiyun 
31*4882a593Smuzhiyun 	if (fflush(stdout))
32*4882a593Smuzhiyun 		return 1;
33*4882a593Smuzhiyun 
34*4882a593Smuzhiyun 	return 0;
35*4882a593Smuzhiyun }
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