问题描述
我最近在继承了一些工作code,这是老2.4.X Linux内核驱动程序和我一直在负责让他们在新的内核2.6或更高的工作。我用3.1.10内核在openSUSE 12.1上运行。
我已经更新从函数register_chrdev原来的code()使用class_create()/ device_create()调用,我可以看到我的设备在/ dev中正确显示。我现在的问题是,我的设备的权限被设置为R / W用户只:
CRW ------- 1根根244,0 8月7日07:57 gcanain
我知道我可以在文件模式通过命令行的文件,或者我可以设置权限的udev ......但反正是有以编程方式做到这一点,这样,当我发出insmod命令,dev的将被安装有了正确的规则了吗?
是否有可能存在,我可以打电话要做到这一点,我缺少任何选项,这些创建API中的任何一个的API?
只是为了澄清,我不希望使用udev规则的部分原因是,我不知道时间提前的设备驱动程序的名称。设备驱动程序在一个循环催生等等名称与数字追加,nNumDevs可以pretty任何东西:
为(i = 0; I< nNumDevs;我++){
的strcpy(的modname,GC_ANAIN_MODULE_NAME);
strcat的(的modname,%D);
device_create(C1,NULL,用mkdev(nMajor,GC_ANAIN_MINOR_VERSION + I),NULL中,modname,I);
}
试试这个:的#include< SYS / stat.h>
INT CHMOD(为const char *路径,mode_t模式);
要么 INT fchmod(INT FD,mode_t模式);
来源:男人-s 2搭配chmod
I've recently inherited some code at work, this is old 2.4.X linux kernel drivers and I've been tasked with getting them working on a newer kernel 2.6 or greater. I'm running on OpenSUSE 12.1 with a 3.1.10 kernel.
I've updated the original code from register_chrdev() to use class_create()/device_create() calls and I can see my devices show up in /dev correctly. My current issue is that the permissions for my device are being set to r/w for user only:
crw------- 1 root root 244, 0 Aug 7 07:57 gcanain
I know I can "chmod" the file via command line, and or I can set up udev permissions... but is there anyway to do this programmatically, such that when I issue the insmod command, the dev will be mounted with the correct rules in place already?
Are there any APIs that might exist that I can call to do this, any options I'm missing in one of these creation APIs?
Just to clarify, part of the reason I don't want to use udev rules is that I don't know the names of the device drivers ahead of time. The device drivers are spawned in a loop and so the names are appended with a digit, nNumDevs can be pretty much anything:
for (i = 0; i < nNumDevs; i++) {
strcpy(Modname,GC_ANAIN_MODULE_NAME);
strcat(Modname,"%d");
device_create(c1, NULL, MKDEV(nMajor, GC_ANAIN_MINOR_VERSION+i), NULL, Modname, i);
}
Try this:#include <sys/stat.h>
int chmod(const char *path, mode_t mode);
ORint fchmod(int fd, mode_t mode);
Source: man -s 2 chmod
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