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#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(__linux__)
#include <linux/close_range.h>
#endif
int main ()
{
// Create a new file descriptor that we immediately close.
// This is of course fine.
int fd = dup (2);
if (fd != -1){
fprintf(stderr, "close fd %d\n", fd);
close (fd);
}
// Shouldn't warn, we are closing everything
// This is a special case for close_range if the last
// argument is ~0U (infinity).
fprintf(stderr, "Closing range (%d, %d).\n", fd, ~0U);
close_range(fd, ~0U, 0);
int fd5 = dup2(1, 5);
int fd7 = dup2(2, 7);
fprintf(stderr, "Closing range (%d, %d).\n", fd5, fd7);
close_range(5, 7, 0);
// Should warn, we close a small range
fprintf(stderr, "Double closing range (%d, %d).\n", fd5, fd7);
close_range(5, 7, 0);
return 0;
}
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