2-22fd.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(int argc, const char *argv[])
{
	int fd;
	while(1){
		if((fd = open("test.txt", O_WRONLY|O_CREAT|O_TRUNC, 0664)) > 0){
			printf("fd = %d\n", fd);		
		}
		else{
			perror("open error");
			return -1;
		}
	}
	close(fd);
	return 0;
}