def spawn(specs, pipe_fd, tty_fd):
# We do not want to get killed by Ctrl-C. We should only exit
# when the child processes have exited.
signal.signal(signal.SIGINT, signal.SIG_IGN)
# We can get these signals when setting the status of child
# processes. Ignore them otherwise we'll get wedged!
signal.signal(signal.SIGTTIN, signal.SIG_IGN)
signal.signal(signal.SIGTTOU, signal.SIG_IGN)
pipe = os.fdopen(pipe_fd, "w", 0)
# Detach from controlling tty and create new session.
os.setsid()
# Set controlling tty.
fcntl.ioctl(tty_fd, termios.TIOCSCTTY, 0)
pgroup = shell_spawn.ProcessGroup(True, NonOwningFDWrapper(tty_fd))
pids = []
for spec in specs:
spec["pgroup"] = pgroup
spec["fds"] = dict((dest_fd, NonOwningFDWrapper(fd))
for dest_fd, fd in spec["fds"].iteritems())
pids.append(shell_spawn.spawn_subprocess(spec))
shell_spawn.close_fds([pipe_fd])
os.chdir("/") # Don't keep directory FD alive via cwd.
pipe.write("%s\n" % repr(pids))
while True:
try:
pid, status = os.waitpid(-1, os.WUNTRACED)
except OSError:
break
pipe.write("%s\n" % repr((pid, status)))
def start_job(self, job_procs, is_foreground, cmd_text):
pgroup = shell_spawn.ProcessGroup(is_foreground, self._tty_fd)
pids = []
for spec in job_procs:
spec["pgroup"] = pgroup
pids.append(shell_spawn.spawn_subprocess(spec))
del spec
# We must ensure that FDs are dropped before any waiting.
job_procs[:] = []
procs = [ChildProcess(self._dispatcher, proc) for proc in pids]
pgid = pgroup.get_pgid()
def to_foreground():
os.tcsetpgrp(self._tty_fd.fileno(), pgid)
job = Job(procs, pgroup.get_pgid(), cmd_text, to_foreground)
self._job_controller.add_job(job, is_foreground)
