open函数例子

#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<stdio.h>
int main()
{
  int fd,size;
  char s []="Linux Programmer!\n",buffer[80];
  fd=open("/root/Documents/kkkkk/leijiangtao/myfile",O_WRONLY|O_CREAT);
  write(fd,s,sizeof(s));
  close(fd);
  fd=open("/root/Documents/kkkkk/leijiangtao/myfile",O_RDONLY);
  size=read(fd,buffer,sizeof(buffer));
  printf("%s",buffer);
  close(fd);
  return 0;
}
//"/root/Documents/leijiangtao/myfile"这句一定要写完整尤其是root前面的那个/
//myfile后面加不加后缀无所谓
//再就是要注意汉子的符号
/*
[[email protected] 已利用]# gcc open.c
[[email protected] 已利用]# ./a.out
Linux Programmer!
[[email protected] 已利用]#
*/