static void
babysit (pid_t grandchild_pid,
int parent_pipe)
{
int sigchld_pipe[2];
/* We don't exec, so we keep parent state, such as the pid that
* _dbus_verbose() uses. Reset the pid here.
*/
_dbus_verbose_reset ();
/* I thought SIGCHLD would just wake up the poll, but
* that didn't seem to work, so added this pipe.
* Probably the pipe is more likely to work on busted
* operating systems anyhow.
*/
if (pipe (sigchld_pipe) < 0)
{
_dbus_warn ("Not enough file descriptors to create pipe in babysitter process\n");
exit (1);
}
babysit_sigchld_pipe = sigchld_pipe[WRITE_END];
#ifndef __SYMBIAN32__
_dbus_set_signal_handler (SIGCHLD, babysit_signal_handler);
#endif
write_pid (parent_pipe, grandchild_pid);
check_babysit_events (grandchild_pid, parent_pipe, 0);
while (TRUE)
{
DBusPollFD pfds[2];
pfds[0].fd = parent_pipe;
pfds[0].events = _DBUS_POLLIN;
pfds[0].revents = 0;
pfds[1].fd = sigchld_pipe[READ_END];
pfds[1].events = _DBUS_POLLIN;
pfds[1].revents = 0;
_dbus_poll (pfds, _DBUS_N_ELEMENTS (pfds), -1);
if (pfds[0].revents != 0)
{
check_babysit_events (grandchild_pid, parent_pipe, pfds[0].revents);
}
else if (pfds[1].revents & _DBUS_POLLIN)
{
char b;
read (sigchld_pipe[READ_END], &b, 1);
/* do waitpid check */
check_babysit_events (grandchild_pid, parent_pipe, 0);
}
}
exit (1);
}
static void
do_exec (int child_err_report_fd,
char * const *argv,
char * const *envp,
DBusSpawnChildSetupFunc child_setup,
void *user_data)
{
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
int i, max_open;
#endif
_dbus_verbose_reset ();
_dbus_verbose ("Child process has PID " DBUS_PID_FORMAT "\n",
_dbus_getpid ());
if (child_setup)
(* child_setup) (user_data);
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
max_open = sysconf (_SC_OPEN_MAX);
for (i = 3; i < max_open; i++)
{
int retval;
if (i == child_err_report_fd)
continue;
retval = fcntl (i, F_GETFD);
if (retval != -1 && !(retval & FD_CLOEXEC))
_dbus_warn ("Fd %d did not have the close-on-exec flag set!", i);
}
#endif
if (envp == NULL)
{
_dbus_assert (environ != NULL);
envp = environ;
}
execve (argv[0], argv, envp);
/* Exec failed */
write_err_and_exit (child_err_report_fd,
CHILD_EXEC_FAILED);
}
static void
do_exec (int child_err_report_fd,
char **argv,
DBusSpawnChildSetupFunc child_setup,
void *user_data)
{
#ifdef DBUS_BUILD_TESTS
int i, max_open;
#endif
_dbus_verbose_reset ();
_dbus_verbose ("Child process has PID %lu\n",
_dbus_getpid ());
if (child_setup)
(* child_setup) (user_data);
#ifdef DBUS_BUILD_TESTS
max_open = sysconf (_SC_OPEN_MAX);
for (i = 3; i < max_open; i++)
{
int retval;
if (i == child_err_report_fd)
continue;
retval = fcntl (i, F_GETFD);
if (retval != -1 && !(retval & FD_CLOEXEC))
_dbus_warn ("Fd %d did not have the close-on-exec flag set!\n", i);
}
#endif
#ifndef __SYMBIAN32__
execv (argv[0], argv);
#endif
/* Exec failed */
write_err_and_exit (child_err_report_fd,
CHILD_EXEC_FAILED);
}