static void qt_sa_sigchld_sigaction(int signum, siginfo_t *info, void *context)
{
// *Never* use the info or contect variables in this function
// (except for passing them to the next signal in the chain).
// We cannot be sure if another library or if the application
// installed a signal handler for SIGCHLD without SA_SIGINFO
// and fails to pass the arguments to us. If they do that,
// these arguments contain garbage and we'd most likely crash.
qt_safe_write(qt_qprocess_deadChild_pipe[1], "", 1);
#if defined (QPROCESS_DEBUG)
fprintf(stderr, "*** SIGCHLD\n");
#endif
// load as volatile
volatile struct sigaction *vsa = &qt_sa_old_sigchld_handler;
if (qt_sa_old_sigchld_handler.sa_flags & SA_SIGINFO) {
void (*oldAction)(int, siginfo_t *, void *) = vsa->sa_sigaction;
if (oldAction)
oldAction(signum, info, context);
} else {
void (*oldAction)(int) = vsa->sa_handler;
if (oldAction && oldAction != SIG_IGN)
oldAction(signum);
}
}
static void sig_child_handler(int sig)
{
::write(sig_child_pipe[1], "@", 1);
// Complicated way of calling the old child handler
void (*oldAction)(int) = ((volatile struct sigaction *)&old_sig_child_handler)->sa_handler;
if (oldAction && oldAction != SIG_IGN)
oldAction(sig);
}
static void qt_sa_sigchld_handler(int signum)
{
qt_safe_write(qt_qprocess_deadChild_pipe[1], "", 1);
#if defined (QPROCESS_DEBUG)
fprintf(stderr, "*** SIGCHLD\n");
#endif
// load it as volatile
void (*oldAction)(int) = ((volatile struct sigaction *)&qt_sa_old_sigchld_handler)->sa_handler;
if (oldAction && oldAction != SIG_IGN)
oldAction(signum);
}
