tep_find_function - Man Page

#include <event-parse​.h>

const char *tep_find_function(struct tep_handle *tep, unsigned long long addr);
unsigned long long tep_find_function_address(struct tep_handle *tep, unsigned long long addr);
int tep_find_function_info(struct tep_handle *tep, unsigned long long addr, const char **name,
                           unsigned long long *start, unsigned long *size);

These functions can be used to find function name and start address, by given address​. The given address does not have to be exact, it will select the function that would contain it​.

The tep_find_function() function returns the function name, which contains the given address addr​. The tep argument is the trace event parser context​.

The tep_find_function_address() function returns the function start address, by given address addr​. The addr does not have to be exact, it will select the function that would contain it​. The tep argument is the trace event parser context​.

The tep_find_function_info() function retrieves the name, starting address (start), and the function text size of the function at address, if it is found​. Note, if the tep handle has a function resolver (used by perf), then size is set to zero​.

The tep_find_function() function returns the function name, or NULL in case it cannot be found​.

The tep_find_function_address() function returns the function start address, or 0 in case it cannot be found​.

The tep_find_function_info() function returns 1 if a function is found for the given address, or 0 if it is not​.

#include <event-parse​.h>
​.​.​.
struct tep_handle *tep = tep_alloc();
​.​.​.
void show_function_name(unsigned long long addr)
{
        const char *fname = tep_find_function(tep, addr);

        if (fname)
                printf("Found function %s at 0x%0llx\n", fname, addr);
        else
                printf("No function found at 0x%0llx\n", addr);
}

void show_function_start_addr(unsigned long long addr)
{
        const char *fname = tep_find_function(tep, addr);
        unsigned long long fstart;

        if (!fname) {
                printf("No function found at 0x%0llx\n", addr);
                return;
        }

        fstart = tep_find_function_address(tep, addr);
        printf("Function %s at 0x%llx starts at 0x%0llx\n",
               fname, addr, fstart);
}

void show_function_info(unsigned long long addr)
{
        const char *fname;
        unsigned long long fstart;
        unsigned long size;

        ret = tep_find_function_info(tep, addr, &fname, &fstart, &size);
        if (!ret) {
                printf("No function found at 0x%0lx\n", addr);
                return;
        }

        printf("Function %s at 0x%lx starts at 0x%0lx and is %ld in size\n",
               fname, addr, fstart, size);
}
​.​.​.

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​.

libtraceevent(3), trace-cmd(1)

Steven Rostedt <rostedt@goodmis​.org​[1]>, author of libtraceevent​.
Tzvetomir Stoyanov <tz​.stoyanov@gmail​.com​[2]>, author of this man page​.

Report bugs to <linux-trace-devel@vger​.kernel​.org​^[3]>

libtraceevent is Free Software licensed under the GNU LGPL 2​.1

https://git​.kernel​.org/pub/scm/libs/libtrace/libtraceevent​.git/

1. rostedt@goodmis.org
   mailto:rostedt@goodmis.org
2. tz.stoyanov@gmail.com
   mailto:tz.stoyanov@gmail.com
3. linux-trace-devel@vger.kernel.org
   mailto:linux-trace-devel@vger.kernel.org