open 函数

需要用到的头文件:

include

include

include

include

include //lseek

mode 是八进制权限,比如0644,或者0755 等。也可以是使用系统已定义的

S_IRWXU 00700 user (file owner) has read, write, and execute permission //用户可读写执行权限

S_IRUSR 00400 user has read permission//用户写权限

S_IWUSR 00200 user has write permission//用户写权限

S_IXUSR 00100 user has execute permission//用户执行权限 (更多选项可查询man手册:man 2 open)

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