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OS/pintos-env/pintos/tests/userprog/open-twice.c

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/* Tries to open the same file twice,
which must succeed and must return a different file descriptor
in each case. */
#include <syscall.h>
#include "tests/lib.h"
#include "tests/main.h"
void
test_main (void)
{
int h1 = open ("sample.txt");
int h2 = open ("sample.txt");
CHECK ((h1 = open ("sample.txt")) > 1, "open \"sample.txt\" once");
CHECK ((h2 = open ("sample.txt")) > 1, "open \"sample.txt\" again");
if (h1 == h2)
fail ("open() returned %d both times", h1);
}