none/tests/fdleak_dup2.c

   1 #include <unistd.h>
   2 #include <fcntl.h>
   3 #include "fdleak.h"
   4
   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 }