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// file : tests/backtrace/driver.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef _WIN32
# include <sys/resource.h> // setrlimit()
#endif
#include <string>
#include <iostream>
#include <exception> // set_terminate(), terminate_handler
#include <system_error>
#include <libbutl/process.hxx>
#include <libbutl/fdstream.hxx>
#include <libbutl/backtrace.hxx>
#undef NDEBUG
#include <cassert>
using namespace std;
using namespace butl;
namespace test
{
// Note: is not static to make sure the stack frame is not optimized out.
//
int
func ()
{
throw system_error (EINVAL, generic_category ());
}
}
static terminate_handler def_term_handler;
// Usages:
//
// argv[0] [-q]
// argv[0] -c [-b]
//
// In the first form run the child processes throwing unhandled exception,
// first of which sets up the backtrace-printing handler prior to throwing,
// and make sure that they terminate in the same way (abnormally or with the
// same exit status). Exit with the zero code if that's the case and the
// children terminated abnormally or with non-zero code and exit with the one
// code otherwise. Redirect stderr to /dev/null for the first child if
// requested (-q) and always for the second one.
//
// In the second form run as a child process that optionally sets up the
// backtrace-printing terminate handler (-b) and throws unhandled exception.
//
int
main (int argc, const char* argv[])
{
bool child (false);
bool backtrace (false);
bool quiet (false);
for (int i (1); i != argc; ++i)
{
string o (argv[i]);
if (o == "-c")
{
child = true;
}
else if (o == "-b")
{
assert (child);
backtrace = true;
}
else if (o == "-q")
{
assert (!child);
quiet = true;
}
else
{
assert (false);
}
}
// Run as a child.
//
if (child)
{
// Disable dumping core file on POSIX.
//
#ifndef _WIN32
struct rlimit rlim {0, 0};
assert (setrlimit (RLIMIT_CORE, &rlim) == 0);
#endif
if (backtrace)
{
def_term_handler = set_terminate ([]()
{
cerr << butl::backtrace ();
if (def_term_handler != nullptr)
def_term_handler ();
});
}
return test::func ();
}
// Run as a parent.
//
auto_fd null (fdopen_null ());
process_exit pe1 (process_run (0 /* stdin */,
1 /* stdout */,
quiet ? null.get () : 2 /* stderr */,
argv[0], "-c", "-b"));
if (pe1)
{
cerr << "error: child exited with zero code" << endl;
return 1;
}
// Always run quiet.
//
process_exit pe2 (process_run (0 /* stdin */,
1 /* stdout */,
null /* stderr */,
argv[0], "-c"));
if (!(pe1.normal () == pe2.normal () &&
(!pe1.normal () || pe1.code () == pe2.code ())))
{
cerr << "error: child processes terminated differently:" << endl <<
" info: with backtrace: " << pe1 << endl <<
" info: without backtrace: " << pe2 << endl;
return 1;
}
return 0;
}
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