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/*
main.cpp - parses command line arguments
Copyright (C) 2009 RedHat inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <argp.h>
#include <stdlib.h>
#include <sysexits.h>
#include "config.h"
#include "backtrace.h"
#include "fallback.h"
#define EX_PARSINGFAILED EX__MAX + 1
#define EX_THREADDETECTIONFAILED EX__MAX + 2
const char *argp_program_version = "abrt-backtrace " VERSION;
const char *argp_program_bug_address = "<crash-catcher@lists.fedorahosted.org>";
static char doc[] = "abrt-backtrace -- backtrace analyzer";
/* A description of the arguments we accept. */
static char args_doc[] = "FILE";
static struct argp_option options[] = {
{"independent" , 'i', 0 , 0, "Prints independent backtrace (fallback)" },
{"single-thread" , 'n', 0 , 0, "Display the crash thread only in the backtrace" },
{"frame-depth" , 'd', "N", 0, "Display only top N frames under the crash frame" },
{"remove-exit-handlers" , 'r', 0 , 0, "Removes exit handlers from the displayed backtrace" },
{"debug-parser" , 'p', 0 , 0, "Prints parser debug information"},
{"debug-scanner" , 's', 0 , 0, "Prints scanner debug information"},
{"verbose" , 'v', 0 , 0, "Print human-friendly superfluous output."},
{ 0 }
};
struct arguments
{
bool independent;
bool single_thread;
int frame_depth; /* negative == do not limit the depth */
bool remove_exit_handlers;
bool debug_parser;
bool debug_scanner;
bool verbose;
char *filename;
};
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
/* Get the input argument from argp_parse, which we
know is a pointer to our arguments structure. */
struct arguments *arguments = (struct arguments*)state->input;
switch (key)
{
case 'i': arguments->independent = true; break;
case 'n': arguments->single_thread = true; break;
case 'd':
if (1 != sscanf(arg, "%d", &arguments->frame_depth))
{
/* Must be a number. */
argp_usage(state);
exit(EX_USAGE); /* Invalid argument */
}
break;
case 'r': arguments->remove_exit_handlers = true; break;
case 'p': arguments->debug_parser = true; break;
case 's': arguments->debug_scanner = true; break;
case 'v': arguments->verbose = true; break;
case ARGP_KEY_ARG:
if (arguments->filename)
{
/* Too many arguments. */
argp_usage(state);
exit(EX_USAGE); /* Invalid argument */
}
arguments->filename = arg;
break;
case ARGP_KEY_END:
if (!arguments->filename)
{
/* Not enough arguments. */
argp_usage(state);
exit(EX_USAGE); /* is there a better errno? */
}
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
/* Our argp parser. */
static struct argp argp = { options, parse_opt, args_doc, doc };
int main(int argc, char **argv)
{
/* Set options default values and parse program command line. */
struct arguments arguments;
arguments.independent = false;
arguments.frame_depth = -1;
arguments.single_thread = false;
arguments.remove_exit_handlers = false;
arguments.debug_parser = false;
arguments.debug_scanner = false;
arguments.verbose = false;
arguments.filename = 0;
argp_parse(&argp, argc, argv, 0, 0, &arguments);
/* Open input file and parse it. */
FILE *fp = fopen(arguments.filename, "r");
if (!fp)
{
fprintf(stderr, "Unable to open '%s'.\n", arguments.filename);
exit(EX_NOINPUT); /* No such file or directory */
}
/* Print independent backtrace and exit. */
if (arguments.independent)
{
struct strbuf *ibt = independent_backtrace(fp);
fclose(fp);
puts(ibt->buf);
strbuf_free(ibt);
return 0; /* OK */
}
/* Try to parse the backtrace. */
struct backtrace *backtrace;
backtrace = do_parse(fp, arguments.debug_parser, arguments.debug_scanner);
/* If the parser failed print independent backtrace. */
if (!backtrace)
{
fseek(fp, 0, SEEK_SET);
struct strbuf *ibt = independent_backtrace(fp);
fclose(fp);
puts(ibt->buf);
strbuf_free(ibt);
/* PARSING FAILED, BUT OUTPUT CAN BE USED */
return EX_PARSINGFAILED;
}
fclose(fp);
/* If a single thread is requested, remove all other threads. */
int retval = 0;
struct thread *crash_thread = NULL;
if (arguments.single_thread)
{
crash_thread = backtrace_find_crash_thread(backtrace);
if (crash_thread)
backtrace_remove_threads_except_one(backtrace, crash_thread);
else
{
fprintf(stderr, "Detection of crash thread failed.\n");
/* THREAD DETECTION FAILED, BUT THE OUTPUT CAN BE USED */
retval = EX_THREADDETECTIONFAILED;
}
}
/* If a frame removal is requested, do it now. */
if (arguments.frame_depth > 0)
backtrace_limit_frame_depth(backtrace, arguments.frame_depth);
/* Frame removal can be done before removing exit handlers */
if (arguments.remove_exit_handlers > 0)
backtrace_remove_exit_handlers(backtrace);
backtrace_print_tree(backtrace, arguments.verbose);
backtrace_free(backtrace);
return retval;
}
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