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1 #include <unistd.h>
2 #include <fcntl.h>
3 #include "fdleak.h"
4 
main(int argc,char ** argv)5 int main (int argc, char **argv)
6 {
7    int s1;
8    int s2;
9 
10    CLOSE_INHERITED_FDS;
11 
12    s1 = DO( open("/dev/null", O_RDONLY) );
13    s2 = DO( open("/dev/null", O_RDONLY) );
14 
15    (void) DO( dup2(s1, 20) );  // dup s1 as fd 20
16    (void) DO( dup2(s1, s2) );  // dup s1 as fd s2, which closes existing s2 fd
17 
18    return 0;
19 }
20