Messages in this thread | | | From | "Vlodavsky, Zvi" <> | Subject | Using "query_module" | Date | Mon, 4 Feb 2002 12:04:19 +0200 |
| |
Please personally CC me with responses on this posting:
I would like to use the "query_module" system call with the QM_SYMBOLS flag in an application, but I am not sure of what the appropriate way of doing it is, and whether it is safe.
I have the man-page for query_module on the system on which I am compiling, but I can't find the function prototype in <linux/module.h>. So, I just wrote the prototype in my code. Is this the way this should be done?
Other than that, the man page states that struct module_symbol looks like this: struct module_symbol { unsigned long value; unsigned long name; };
But in module.h it is defined as: struct module_symbol { unsigned long value; const char *name; };
From my understanding, the second definition is the way the kernel uses this struct, and the first definition is the way the user should interpret the result of query_module with the QM_SYMBOLS flag. Am I right? (Shouldn't there be 2 different structures for this?)
Most importantly, I would like to understand whether it is safe to use this system call. If I compile my application on a machine in which this function is implemented (in libc), is the system call guaranteed to work on kernels 2.2 and up? Do I need to do a preliminary check such as "if (query_module(NULL, 0, NULL, 0, NULL))" for the existence of the system call, or would it simply fail if I use it regularly?
Thanks for your help, Zvi.
--------------- Zvi Vlodavsky Software Engineer Network Communications Group, Intel Corp. Zvi.Vlodavsky@intel.com
Disclaimer: In this e-mail, I do not speak on behalf of Intel corp. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |