Date: Wed, 31 Jul 2024 16:39:43 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Nimbly2329 <hjlftdygaqf@use.startmail.com>, freebsd-drivers@freebsd.org Subject: Re: Asistence with sysctl proc's handle in kernel space Message-ID: <1116740a-8f7c-4adf-afdf-cc12d854ea84@FreeBSD.org> In-Reply-To: <172064548937.305907.8627778909077618453@startmail.com> References: <172064548937.305907.8627778909077618453@startmail.com>
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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
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