Re: Asistence with sysctl proc's handle in kernel space

I realized just after sending, still I have not found documentation in the
FreeBSD site:  

>
>     On 7/10/24 17:04, Nimbly2329 wrote:
>     > I am following FreeBSD drivers: A guide for the intrepid by Joseph
> Kong to
>     > learn to write FreeBSD device drivers.
>     >
>     >  
>     >
>     > I got to the sysctl subchapter where is more or less this code
>     >
>     >  
>     >
>     > #include <sys/param.h>
>     >
>     > #include <sys/sysctl.h>
>     >
>     >  
>     >
>     > ....
>     >
>     >  
>     >
>     > static int sysctl_set_buffer_size(SYSCTL_HANDLER_ARGS) {
>     >
>     > int error = 0;
>     >
>     > int size = echo_message->buffer_size;
>     >
>     > error = sysctl_handle_int(oidp, &size, 0, req);
>     >
>     > if (error || !req->newptr || echo_message->buffer_size == size) return
>     > (error);
>     >
>     > if (size >= 128 && size <= 512) {
>     >
>     > echo_message->buffer = realloc(echo_message->buffer, size, M_ECHO,
> M_WAITOK);
>     >
>     > echo_message->buffer_size = size;
>     >
>     > if (echo_message->length >= size) {
>     >
>     > echo_message->length = size - 1;
>     >
>     > echo_message->buffer[size - 1] = '\0';
>     >
>     > }
>     >
>     > } else {
>     >
>     > error = EINVAL;
>     >
>     > }
>     >
>     > return (error);
>     >
>     > }
>     >
>     >  
>     >
>     > but when compiling I got the error:
>     >
>     >  
>     >
>     > error: call to undeclared function 'sysctl_int_handle'; ISO C99 and
> later do
>     > not support implicit function declarations [-Werror,-Wimplicit-
> function-
>     > declaration]
>     >
>     > 167 | error = sysctl_int_handle(oidp, &size, 0, req);
>     >
>  
>     Your error here shows 'sysctl_int_handle' instead of 'sysctl_handle_int'
>  
>     --
>     John Baldwin
>  
>  
>  
>  
>     >