test1.c

MINIX操作系统的内核修改补丁

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

void main()
{
	int fd, r;
	char buf[32];

	fd = open("data", O_CREAT | O_IMMED | O_RDWR);
	if(fd < 0) {
		printf("Fail to file open\n");
		return;
	}

	r = write(fd, "This is an immediate file", 8);
	r = write(fd, "0123456789ABCDEF\0", 16);

	printf("File write: %d\n", r);

	close(fd);	

	fd = open("data", O_RDWR);
	if(fd < 0) {
		printf("Fail to file open\n");
		return;
	}
	r = read(fd, buf, 32);

	buf[31] = '\0';

	printf("File read %d bytes: %s\n", r, buf);
}