Tkz for the first clarifications..
If i use the dynamical allocation in the driver and
the script of the Rubini's book. They will catch the
same major number?!
Thank you in advance.
Atenciosamente, thr~~~
--- Ketan Mukadam <kmukadam@neomagic.com> escreveu: >
> You can also use the following function to do the
> node creation during run
> time. Call this function just before device open in
> the application.
>
> #define MAX_COL 50
> int make_device_node(char* name)
> {
> char s[MAX_COL];
> FILE* fp;
> char* p = s;
> int major;
> memset((void *)s,0,MAX_COL);
> snprintf((char *)s,MAX_COL,"cat
> /proc/devices | grep %s >
> ketan.tmp",name);
> system(s);
> fp = fopen("ketan.tmp","r");
> if(fp == NULL)
> printf("unable to open a temp
> file\n");
> else
> {
> memset((void
> *)s,0,MAX_COL);
> fgets(s,MAX_COL,fp);
> strtok(s," ");
> p=strtok(NULL, " ");
> printf("The Major No. is %s
> for Device : %s",s,p);
> major = atoi(s);
> system("rm -f ketan.tmp");
> snprintf((char
> *)s,MAX_COL,"mknod /dev/%s c %d
> 0",name,major);
> printf(" Executing =
> %s\n",s);
> system(s);
> }
> }
>
> You can also improve it to include the minor number
> (which is assumed to be
> 0 in this case)
>
> Ketan
>
>
> At 05:30 AM 7/7/2004, you wrote:
> >Hello everybody
> >
> >I'm reading the "Linux Device Drivers" (Alessandro
> >Rubini), and i'm in chapter that we learn to build
> a
> >char driver. I'm necesarilly at the point where he
> >argues about dynamical allocation of major numbers
> but
> >i have one doubt (for the moment), if i use the
> >dynamical allocation, its because i dont have a one
> >major number exclusive of my char driver and then..
> >who will make the device nodes to my char driver?!
> I
> >have to guide my driver to print the major number
> that
> >it found dynamically and then make the nodes
> manually?
> >
> >
> >Forgive eventual english mistakes..
> >
> >Atenciosamente, thr~~
> >
> >
> >
> >
> >
>
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>
>
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