diff options
Diffstat (limited to 'Documentation/libtraceevent-func_find.txt')
| -rw-r--r-- | Documentation/libtraceevent-func_find.txt | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/Documentation/libtraceevent-func_find.txt b/Documentation/libtraceevent-func_find.txt new file mode 100644 index 0000000..26fac68 --- /dev/null +++ b/Documentation/libtraceevent-func_find.txt @@ -0,0 +1,131 @@ +libtraceevent(3) +================ + +NAME +---- +tep_find_function,tep_find_function_address,tep_find_function_info - Find function name / start address. + +SYNOPSIS +-------- +[verse] +-- +*#include <event-parse.h>* + +const char pass:[*]*tep_find_function*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_); +unsigned long long *tep_find_function_address*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_); +int *tep_find_function_info*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_, const char pass:[**]_name_, + unsigned long long pass:[*]_start_, unsigned long pass:[*]_size_); +-- + +DESCRIPTION +----------- +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. + +RETURN VALUE +------------ +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. + +EXAMPLE +------- +[source,c] +-- +#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); +} +... +-- + +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. +-- + +SEE ALSO +-------- +*libtraceevent*(3), *trace-cmd*(1) + +AUTHOR +------ +[verse] +-- +*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. +*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. +-- +REPORTING BUGS +-------------- +Report bugs to <linux-trace-devel@vger.kernel.org> + +LICENSE +------- +libtraceevent is Free Software licensed under the GNU LGPL 2.1 + +RESOURCES +--------- +https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ |