用fopen打开文件时如何设置文件的权限。

[maenxiang]

用fopen打开文件时如何设置文件的权限及文件的用户id

[blh]

1.权限
r Open text file for reading. The stream is positioned at the beginning of
the file.

r+ Open for reading and writing. The stream is positioned at the beginning of
the file.

w Truncate file to zero length or create text file for writing. The stream is
positioned at the beginning of the file.

w+ Open for reading and writing. The file is created if it does not exist,
otherwise it is truncated. The stream is positioned at the beginning of the
file.

a Open for writing. The file is created if it does not exist. The stream is
positioned at the end of the file.

a+ Open for reading and writing. The file is created if it does not exist.
The stream is positioned at the end of the file.

2。int fchown(int fd, uid_t owner, gid_t group);

[rtdb]

支持楼上。

要想更详细的设定， 还是用OpenFile吧。

[积木]

没有这个参数，你只能自己另外写判断，因为dos 或 windows 都没有给文件设置用户（不像Linux）,写一个简单的，你看看吧，呵呵
char* pass(char* user_name)/*根据用户名取密码*/
int user_file(char * filename,char* user_name char* password)/*判断权限*/
{
if(!strcmp(pass(user_name),password))
return 0;
FILE* fp = fopen(filename,"r");
/*操作*/
fclose(fp);
return 1;
}

[maenxiang]

感谢各为的回答，我的意思可能没有表述清楚。我重新表述以下：
是在UNIX下用C编程，不是DOS WINDOWS
我是想用fopen打开文件（文件还不存在，是用来创建文件），怎么样给新建的文件赋上相应权限（相当于chmod的那种权限）。
例如：
char ini_path[]="smindb.ini";
int ini_handle;
ini_handle=open(ini_path,O_WRONLY|O_CREAT|O_APPEND,S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

怎么用fopen创建文件时也将S_IRUSR S_IWUSR S_IRGRP S_IROTH权限赋给文件"smindb.ini"呢？

或者有什么其他方式可以实现，总之我要用缓冲方式打开文件。

[sunriselx]

FILE* fp = fopen();
int fd = fileno(fp);
fchmod(fd, 0664);

OK?

[maenxiang]

ok 还有什么好方法。