设置字符设备权限

echoyin59

在/dev/下有个a设备，在创建这个设备时，赋予权限666，现在在调用它的时候我要改变它的权限，在代码里，如何来做呢？
有没有什么方法？

guocslock

SYNOPSIS

#include <sys/stat.h>

int chmod(const char *path, mode_t mode);
int fchmodat(int fd, const char *path, mode_t mode, int flag);

DESCRIPTION

The chmod() function shall change S_ISUID, S_ISGID,  S_ISVTX,  and the file permission bits of the file named by the pathname pointed to by the path argument to the corresponding bits in the mode argument. The application shall ensure that the effective user ID of the process matches the owner of the file or the process has appropriate privileges in order to do this.

The fchmodat() function shall be equivalent to the chmod() function except in the case where path specifies a relative path. In this case the file to be changed is determined relative to the directory associated with the file descriptor fd instead of the current working directory. If the file descriptor was opened without O_SEARCH, the function shall check whether directory searches are permitted using the current permissions of the directory underlying the file descriptor. If the file descriptor was opened with O_SEARCH, the function shall not perform the check.