On Fri, 12 Apr 2019 16:37:53 +0300
Tzvetomir Stoyanov <tstoyanov@xxxxxxxxxx> wrote:
> +EXAMPLE
> +-------
> +[source,c]
> +--
> +#include <event-parse.h>
> +...
> +struct tep_handle *tep = tep_alloc();
> +...
> +char *my_resolve_kernel_addr(void *context,
> + unsigned long long *addrp, char **modp)
> +{
I would at least have something in there instead of just a stub
function. You can make up a resolver. But just a stub function is not
useful to know.
struct db *function_database = context;
struct symbol *sym = sql_lookup(function_database, *addrp);
if (!sym)
return NULL;
*modp = sym->module_name;
return sym->name;
}
> + return NULL;
> +}
> +
> +void show_function( unsigned long long addr)
> +{
> + unsigned long long fstart;
> + const char *fname;
> +
> + if (tep_set_function_resolver(tep, my_resolve_kernel_addr, NULL) != 0) {
tep_set_function_resolver(tep, my_resolve_kernel_addr,
function_database) != 0) {
This gives an idea on how to use it. Sure it's a fictional database,
but it is much more descriptive than passing in NULL that does nothing.
> + /* failed to register my_resolve_kernel_addr */
> + }
> +
> + /* These APIs use my_resolve_kernel_addr() to resolve the addr */
> + fname = tep_find_function(tep, addr);
> + fstart = tep_find_function_address(tep, addr);
> +
> + /*
> + addr is in function named fname, starting at fstart address,
> + at offset (addr - fstart)
> + */
> +
> + tep_reset_function_resolver(tep);
> +
> +}
> +...
> + if (tep_register_function(tep, "kernel_function_foo",
> + (unsigned long long) 0x12345678, NULL) != 0) {
Prehaps add a module to register too.
Thanks!
-- Steve
> + /* Failed to register kernel_function_foo address mapping */
> + }
> +...
> + if (tep_register_print_string(tep, "print string",
> + (unsigned long long) 0x87654321, NULL) != 0) {
> + /* Failed to register "print string" address mapping */
> + }
> +...
> +--
> +
> +FILES
> +-----
> +[verse]
> +--
> +*event-parse.h*
> + Header file to include in order to have access to the library APIs.
> +*-ltraceevent*
> + Linker switch to add when building a program that uses the library.
> +--
> +
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