static void setup_signals(void)
{
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_handler = term_handler;
sa.sa_flags = 0;
if (sigaction(SIGTERM, &sa, NULL))
err_errno("sigaction() failed");
if (sigaction(SIGINT, &sa, NULL))
err_errno("sigaction() failed");
}
static int is_tailable(const char *file)
{
struct stat sb;
/* follow symlinks */
if (stat(file, &sb))
err_errno("stat() failed");
return S_ISREG(sb.st_mode);
}
//----------------------------------------------------------------------
// close$NOCANCEL() interpose function
//----------------------------------------------------------------------
extern "C" int close$NOCANCEL$__interposed__(int fd) {
const int pid = get_interposed_pid();
if (pid >= 0) {
Locker locker(&g_mutex);
const int err = close$NOCANCEL(fd);
NegativeErrorErrno err_errno(err);
StringSP description_sp(new String);
if (err == -1)
description_sp->printf(
"pid=%i: close$NOCANCEL (fd=%i) => %i errno = %i (%s))", pid, fd, err,
err_errno.get_errno(), strerror(err_errno.get_errno()));
else
description_sp->printf("pid=%i: close$NOCANCEL (fd=%i) => %i", pid, fd,
err);
if (g_log_all_calls)
description_sp->log(get_logging_fd());
if (err == 0) {
if (fd >= 0)
save_backtrace(fd, err, description_sp, false);
} else if (err == -1) {
if (err_errno.get_errno() == EBADF && fd != -1) {
backtrace_error("close$NOCANCEL (fd=%d) resulted in EBADF\n:", fd);
FDEventMap::iterator pos = g_fd_event_map.find(fd);
if (pos != g_fd_event_map.end()) {
log(get_logging_fd(), pos->second.back().get(),
"\nfd=%d was previously %s with this event:\n", fd,
pos->second.back()->IsCreateEvent() ? "opened" : "closed");
}
}
}
return err;
} else {
return close$NOCANCEL(fd);
}
}
//----------------------------------------------------------------------
// socketpair() interpose function
//----------------------------------------------------------------------
extern "C" int socketpair$__interposed__(int domain, int type, int protocol,
int fds[2]) {
const int pid = get_interposed_pid();
if (pid >= 0) {
Locker locker(&g_mutex);
fds[0] = -1;
fds[1] = -1;
const int err = socketpair(domain, type, protocol, fds);
NegativeErrorErrno err_errno(err);
StringSP description_sp(
new String("pid=%i: socketpair (domain=%i, type=%i, protocol=%i, "
"{fd=%i, fd=%i}) -> err=%i",
pid, domain, type, protocol, fds[0], fds[1], err));
if (g_log_all_calls)
description_sp->log(get_logging_fd());
if (fds[0] >= 0)
save_backtrace(fds[0], err_errno.get_errno(), description_sp, true);
if (fds[1] >= 0)
save_backtrace(fds[1], err_errno.get_errno(), description_sp, true);
return err;
} else {
return socketpair(domain, type, protocol, fds);
}
}