hello1

linux文件I-O exit.c fork.c select.c write.c waitpid.c execlp.c execle.c

/*open.c*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>

int main(void)
{
	int fd;
	if((fd = open("/tmp/hello.c", O_CREAT | O_TRUNC | O_WRONLY,0600 ))<0){
		perror("open:");
		exit(1);
	}
	else
		printf("open file:hello.c %d\n",fd);
	if( close(fd) < 0 ){
		perror("close:");
		exit(1);
	}
	else
		printf("Close hello.c\n");
	exit(0);
}