132 lines
3.5 KiB
Plaintext
132 lines
3.5 KiB
Plaintext
libtraceevent(3)
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================
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NAME
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----
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tep_find_function,tep_find_function_address,tep_find_function_info - Find function name / start address.
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SYNOPSIS
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--------
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[verse]
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--
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*#include <event-parse.h>*
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const char pass:[*]*tep_find_function*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_);
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unsigned long long *tep_find_function_address*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_);
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int *tep_find_function_info*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_, const char pass:[**]_name_,
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unsigned long long pass:[*]_start_, unsigned long pass:[*]_size_);
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--
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DESCRIPTION
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-----------
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These functions can be used to find function name and start address, by given
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address. The given address does not have to be exact, it will select the function
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that would contain it.
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The *tep_find_function()* function returns the function name, which contains the
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given address _addr_. The _tep_ argument is the trace event parser context.
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The *tep_find_function_address()* function returns the function start address,
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by given address _addr_. The _addr_ does not have to be exact, it will select the
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function that would contain it. The _tep_ argument is the trace event parser context.
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The *tep_find_function_info()* function retrieves the _name_, starting address (_start_),
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and the function text _size_ of the function at _address_, if it is found. Note,
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if the _tep_ handle has a function resolver (used by perf), then _size_ is set to
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zero.
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RETURN VALUE
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------------
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The *tep_find_function()* function returns the function name, or NULL in case
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it cannot be found.
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The *tep_find_function_address()* function returns the function start address,
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or 0 in case it cannot be found.
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The *tep_find_function_info()* function returns 1 if a function is found for the
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given address, or 0 if it is not.
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EXAMPLE
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-------
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[source,c]
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--
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#include <event-parse.h>
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...
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struct tep_handle *tep = tep_alloc();
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...
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void show_function_name(unsigned long long addr)
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{
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const char *fname = tep_find_function(tep, addr);
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if (fname)
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printf("Found function %s at 0x%0llx\n", fname, addr);
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else
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printf("No function found at 0x%0llx\n", addr);
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}
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void show_function_start_addr(unsigned long long addr)
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{
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const char *fname = tep_find_function(tep, addr);
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unsigned long long fstart;
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if (!fname) {
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printf("No function found at 0x%0llx\n", addr);
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return;
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}
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fstart = tep_find_function_address(tep, addr);
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printf("Function %s at 0x%llx starts at 0x%0llx\n",
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fname, addr, fstart);
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}
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void show_function_info(unsigned long long addr)
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{
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const char *fname;
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unsigned long long fstart;
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unsigned long size;
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ret = tep_find_function_info(tep, addr, &fname, &fstart, &size);
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if (!ret) {
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printf("No function found at 0x%0lx\n", addr);
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return;
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}
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printf("Function %s at 0x%lx starts at 0x%0lx and is %ld in size\n",
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fname, addr, fstart, size);
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}
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...
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--
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FILES
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-----
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[verse]
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--
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*event-parse.h*
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Header file to include in order to have access to the library APIs.
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*-ltraceevent*
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Linker switch to add when building a program that uses the library.
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--
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SEE ALSO
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--------
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*libtraceevent*(3), *trace-cmd*(1)
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AUTHOR
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------
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[verse]
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--
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*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
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*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
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--
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REPORTING BUGS
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--------------
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Report bugs to <linux-trace-devel@vger.kernel.org>
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LICENSE
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-------
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libtraceevent is Free Software licensed under the GNU LGPL 2.1
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RESOURCES
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---------
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https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
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