int
main (int argc, char **argv)
{
if (argc > 1)
verbose = 1;
if (verbose)
printf ("Caching: none\n");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_NONE);
doit ();
if (verbose)
printf ("Caching: global\n");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_GLOBAL);
doit ();
// UNW_CACHE_PER_THREAD is not yet implemented
// if (verbose)
// printf ("Caching: per-thread\n");
// unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
// doit ();
if (verbose)
printf ("SUCCESS\n");
return 0;
}
int
main (int argc, char **argv)
{
struct rlimit rlim;
rlim.rlim_cur = RLIM_INFINITY;
rlim.rlim_max = RLIM_INFINITY;
setrlimit (RLIMIT_STACK, &rlim);
memset (big, 0xaa, sizeof (big));
if (argc > 1)
{
maxlevel = atol (argv[1]);
if (argc > 2)
iterations = atol (argv[2]);
}
measure_init ();
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_NONE);
doit ("no cache ");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_GLOBAL);
doit ("global cache ");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
doit ("per-thread cache");
return 0;
}
int
main (int argc, char **argv)
{
if (argc > 1)
verbose = 1;
if (verbose)
printf ("Caching: none\n");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_NONE);
doit ();
if (verbose)
printf ("Caching: global\n");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_GLOBAL);
doit ();
if (verbose)
printf ("Caching: per-thread\n");
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
doit ();
if (nerrors)
{
fprintf (stderr, "FAILURE: detected %d errors\n", nerrors);
exit (-1);
}
if (verbose)
printf ("SUCCESS\n");
return 0;
}
struct bt_data *bt_init(pid_t pid)
{
struct bt_data *btd;
btd = malloc(sizeof(struct bt_data));
if (!btd)
abort();
btd->as = unw_create_addr_space(&_UPT_accessors, 0);
if (!btd->as)
abort();
unw_set_caching_policy (btd->as, UNW_CACHE_GLOBAL);
btd->ui = _UPT_create(pid);
return btd;
}
bool
trace_init(pid_t pid, ptrace_context *ctx) {
ctx->pid = pid;
if (!read_cmdline(pid, &ctx->cmdline))
return false;
ctx->addr_space = unw_create_addr_space(&_UPT_accessors, __BYTE_ORDER);
if (!ctx->addr_space)
return false;
unw_set_caching_policy(ctx->addr_space, UNW_CACHE_GLOBAL);
ctx->unwind_rctx = _UPT_create(ctx->pid);
if (!ctx->unwind_rctx)
return false;
sprintf(ctx->procstat_path, "/proc/%d/stat", pid);
return true;
}
int
main(int argc, char **argv) {
int status, pid, pending_sig, optind = 1, state = 1;
as = unw_create_addr_space(&_UPT_accessors, 0);
if (!as)
panic ("unw_create_addr_space() failed");
if (argc == 1) {
static char *args[] = {"self", "/bin/ls", "/usr", NULL};
/* automated test case */
argv = args;
}
else if (argc > 1)
while (argv[optind][0] == '-') {
if (strcmp(argv[optind], "-v") == 0)
++optind, verbose = 1;
else if (strcmp(argv[optind], "-i") == 0)
++optind, trace_mode = INSTRUCTION; /* backtrace at each insn */
else if (strcmp(argv[optind], "-s") == 0)
++optind, trace_mode = SYSCALL; /* backtrace at each syscall */
else if (strcmp(argv[optind], "-t") == 0)
/* Execute until raise(SIGUSR1), then backtrace at each insn
until raise(SIGUSR2). */
++optind, trace_mode = TRIGGER;
else if (strcmp(argv[optind], "-c") == 0)
/* Enable caching of unwind-info. */
++optind, unw_set_caching_policy(as, UNW_CACHE_GLOBAL);
else if (strcmp(argv[optind], "-n") == 0)
/* Don't look-up and print symbol names. */
++optind, print_names = 0;
else
fprintf(stderr, "unrecognized option: %s\n", argv[optind++]);
if (optind >= argc)
break;
}
target_pid = fork();
if (!target_pid) {
/* child */
if (!verbose)
dup2(open("/dev/null", O_WRONLY), 1);
ptrace(PTRACE_TRACEME, 0, 0, 0);
if ((argc > 1) && (optind == argc)) {
fprintf(stderr, "Need to specify a command line for the child\n");
exit(-1);
}
execve(argv[optind], argv + optind, environ);
_exit(-1);
}
atexit(target_pid_kill);
ui = _UPT_create(target_pid);
while (nerrors <= nerrors_max) {
pid = wait4(-1, &status, 0, NULL);
if (pid == -1) {
if (errno == EINTR)
continue;
panic ("wait4() failed (errno=%d)\n", errno);
}
pending_sig = 0;
if (WIFSIGNALED (status) || WIFEXITED (status)
|| (WIFSTOPPED (status) && WSTOPSIG (status) != SIGTRAP)) {
if (WIFEXITED (status)) {
if (WEXITSTATUS (status) != 0)
panic ("child's exit status %d\n", WEXITSTATUS(status));
break;
}
else if (WIFSIGNALED (status)) {
if (!killed)
panic ("child terminated by signal %d\n", WTERMSIG(status));
break;
}
else {
pending_sig = WSTOPSIG (status);
/* Avoid deadlock: */
if (WSTOPSIG (status) == SIGKILL)
break;
if (trace_mode == TRIGGER) {
if (WSTOPSIG (status) == SIGUSR1)
state = 0;
else if (WSTOPSIG (status) == SIGUSR2)
state = 1;
}
if (WSTOPSIG (status) != SIGUSR1 && WSTOPSIG (status) != SIGUSR2) {
static int count = 0;
if (count++ > 100) {
panic ("Too many child unexpected signals (now %d)\n",
WSTOPSIG(status));
killed = 1;
}
}
}
}
switch (trace_mode) {
case TRIGGER:
if (state)
ptrace(PTRACE_CONT, target_pid, 0, 0);
else {
do_backtrace();
if (ptrace(PTRACE_SINGLESTEP, target_pid, 0, pending_sig) < 0) {
panic ("ptrace(PTRACE_SINGLESTEP) failed (errno=%d)\n", errno);
killed = 1;
}
}
break;
case SYSCALL:
if (!state)
do_backtrace();
state ^= 1;
ptrace(PTRACE_SYSCALL, target_pid, 0, pending_sig);
break;
case INSTRUCTION:
do_backtrace();
ptrace(PTRACE_SINGLESTEP, target_pid, 0, pending_sig);
break;
}
if (killed)
kill(target_pid, SIGKILL);
}
_UPT_destroy(ui);
unw_destroy_addr_space(as);
if (nerrors) {
printf("FAILURE: detected %d errors\n", nerrors);
exit(-1);
}
if (verbose)
printf("SUCCESS\n");
return 0;
}