1：open 函数
头文件 #include<fcntl.h>
int open(const cahr *pathname /*被打开的文件*/
const char flags,
);
/*
* test.c
*
* Created on: Jun 26, 2012
* Author: linux
*/
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<fcntl.h>
int main() {
char buf_write[] = "abcedfg";
char buf_read[10];
int fd;
if ((fd = open("/test/hello.txt", O_RDWR, 0666)) == 0) {
printf("error");
close(fd);
}
int len = strlen(buf_write)+1;
//int len=5;
int size = write(fd, buf_write, len);
printf("%d\n", size);
//puts(buf_write);
lseek(fd, 0, SEEK_SET);
size = read(fd, buf_read, len);
puts(buf_read);
close(fd);
return 0;
}