ede/ede-bug-tools/ede-crasher/GdbOutput.cpp

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/*
* $Id$
*
* ede-crasher, a crash handler tool
* Part of Equinox Desktop Environment (EDE).
* Copyright (c) 2008-2009 EDE Authors.
*
* This program is licensed under terms of the
* GNU General Public License version 2 or newer.
* See COPYING for details.
*/
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <edelib/Debug.h>
#include <edelib/File.h>
#include <edelib/FileTest.h>
#include <edelib/TempFile.h>
#include "GdbOutput.h"
#define CORE_FILE "core"
EDELIB_NS_USING(String)
EDELIB_NS_USING(TempFile)
EDELIB_NS_USING(file_path)
EDELIB_NS_USING(file_test)
EDELIB_NS_USING(file_remove)
EDELIB_NS_USING(FILE_TEST_IS_REGULAR)
static int write_str(int fd, const char *str) {
int len = strlen(str);
return ::write(fd, str, len);
}
bool gdb_output_generate(const char *path, TempFile &t, int pid) {
E_RETURN_VAL_IF_FAIL(path != NULL, false);
int tfd = -1;
TempFile scr;
if(!scr.create("/tmp/.ecrash-script")) {
E_WARNING(E_STRLOC ": Unable to create temporary file for debugger script: (%i) %s",
scr.status(), strerror(scr.status()));
return false;
}
if(!t.create("/tmp/.ecrash-output")) {
E_WARNING(E_STRLOC ": Unable to create temporary file for debugger output: (%i) %s",
t.status(), strerror(t.status()));
return false;
}
tfd = t.handle();
/* write script */
::write(scr.handle(), "bt\nquit\n", 8);
scr.set_auto_delete(true);
scr.close();
String gdb_path = file_path("gdb");
if(gdb_path.empty()) {
/* write straight to the file, so dialog could show it */
write_str(tfd, "Unable to find gdb. Please install it first");
/* see it as valid, so dialog could be shown */
return true;
}
/*
* to find core file, we will try these strategies: first try to open 'core.PID' if
* we got PID (default on linux); if does not exists, try to open 'core'; everything is
* assumed current folder, whatever it was set
*/
bool core_found = false;
String core_path;
if(pid > -1) {
core_path.printf("%s.%i", CORE_FILE, pid);
if(file_test(core_path.c_str(), FILE_TEST_IS_REGULAR))
core_found = true;
}
if(!core_found) {
core_path = CORE_FILE;
if(file_test(core_path.c_str(), FILE_TEST_IS_REGULAR))
core_found = true;
}
if(!core_found) {
write_str(tfd, "Unable to find core file. Backtrace will not be done.");
/* see it as valid, so dialog could be shown */
return true;
}
pid_t gdb_pid = fork();
if(gdb_pid == -1) {
E_WARNING(E_STRLOC ": Unable to fork the process\n");
return false;
} else if(gdb_pid == 0) {
/* child; redirect to the file */
dup2(tfd, 1);
t.close();
::write(1, " ", 1);
char* argv[8];
argv[0] = (char*)gdb_path.c_str();
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argv[1] = (char*)"--quiet";
argv[2] = (char*)"--batch";
argv[3] = (char*)"-x";
argv[4] = (char*)scr.name();
argv[5] = (char*)path;
argv[6] = (char*)core_path.c_str();
argv[7] = 0;
execvp(argv[0], argv);
return false;
} else {
int status;
if(waitpid(gdb_pid, &status, 0) != gdb_pid) {
E_WARNING(E_STRLOC ": Failed to execute waitpid() properly\n");
return false;
}
}
file_remove(core_path.c_str());
return true;
}