镜空勿朴

#include
#include
#include
#include
#define MSG_LEN 256
int main(int argc, char *argv)
{
int num, fd;
char msg[MSG_LEN+1];
if (argc == 1)
return EXIT_FAILURE;
/ open the file /
if ((fd=open(argv[1], O_RDONLY, 0)) < 0)
return EXIT_FAILURE;
do{
/ read the file /
if ((num = read(fd, msg, MSG_LEN)) < 0) {
close(fd);
return EXIT_FAILURE;
} else if (num == 0) {
break;
}
/ display on screen /
msg[num] = ‘’;
printf("%s", msg);
}while(1);
printf("n");
/ exit */
close(fd);
sync();
return EXIT_SUCCESS;
}