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#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
int fd, fd_parent;
char buf[1];
if (argc != 2) {
return 1;
}
fd_parent = atoi(argv[1]);
/* If we open a new file, the fd we obtain should be fd_parent + 1 */
fd = open("open_plusplus_fd", O_CREAT|O_RDWR, 0660);
if (fd != fd_parent + 1) {
return 2;
}
/* Also, writing to fd_parent should succeed */
if (write(fd_parent, buf, sizeof(buf)) <= 0) {
return 3;
}
return 0;
}
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