def signal(self, pid, sig):
flags = self.allflags[pid]
if sig == 'SIGTRAP':
if flags.has_key('exectrappending'):
# assume first SIGTRAP following an exec is due to the
# exec (FIX: not strictly true?)
del flags['exectrappending']
return ('SIG_0',)
# XXX: merge these?
if flags.has_key('skiptrap'):
del flags['skiptrap']
return ('SIG_0',)
elif sig == 'SIGCHLD' and flags.has_key('deathnotice'):
# FIX: This is somewhat bogus. For starters, don't do this if
# parent or child has exec'ed since clone
# FIX: this deathnotice queueing is probably bogus, too
dpid, dsignal = flags['deathnotice'].pop(0)
#if self.allflags.has_key(dpid): # ???
# del self.allflags[dpid] # ???
if not flags['deathnotice']:
del flags['deathnotice']
return (signalmap.lookup_name(dsignal),)
elif sig == 'SIGSTOP' and flags.has_key('skipstop'):
# in 2.4, there's a gratuitous SIGSTOP right after fork/etc
del flags['skipstop']
return ('SIG_0',)
def trace_signal(pid, flags, tricklist, sig):
if not _signal_weedout_mask[sig]:
return sig
signalname = signalmap.lookup_name(sig)
# innermost trick gets first shot at the signal
tricklist = tricklist[:]
tricklist.reverse()
for trick, callmask, signalmask in tricklist:
if (not signalmask or signalmask.has_key(signalname)) and trick.is_enabled(pid):
r = trick.signal(pid, signalname)
# r is None or (signal, )
if r != None:
assert len(r) == 1, "signal must return None or a 1-tuple"
signalname = r[0]
assert isinstance(signalname, types.StringType) and (
0 <= signalmap.lookup_number(signalname) < signal.NSIG
), ("bad signal %s; must use signal name" % signalname)
if signalname == "SIG_0":
break
# XXX: perhaps we ought to also ignore signals that the
# process is ignoring ??
return signalmap.lookup_number(signalname)
def callafter(self, pid, call, result, state):
if call == 'rt_sigaction' or call == 'sigaction' or call == 'signal':
if state != None and not (-1024 < result < 0):
sig = state[0]
f = self.allflags[pid]
handler = state[1]
if sig == signal.SIGCHLD:
sa_flags = ptrace.peekdata(pid, handler + 4)
f['SA_NOCLDSTOP'] = sa_flags & 0x1 # SA_NOCLDSTOP
else:
if call != 'signal':
handler = ptrace.peekdata(pid, handler)
f[signalmap.lookup_name(sig)] = handler
elif call == 'wait4' or call == 'waitpid':
f = self.allflags[pid]
if f.has_key('waitresult'):
wpid, statusptr, status = f['waitresult']
del f['waitresult']
del f['waiting']
if statusptr != 0:
try:
ptrace.pokedata(pid, statusptr, status)
except OSError, e:
if e.errno != errno.ESRCH:
# FIX
assert 0, "wait status pointer bad? (%s)" % e
else:
print 'waiter dead or not stopped' # XXX
return wpid
# XXX: is this actually correct and useful?
if result == -errno_internal.ERESTARTNOHAND: # like pause
return -errno_internal.ERESTARTSYS # like wait
def trace_exit(pid, flags, tricklist, exitstatus, termsig):
signalname = None
if termsig:
signalname = signalmap.lookup_name(termsig)
for trick, callmask, signalmask in tricklist:
if trick.is_enabled(pid): trick.exit(pid, exitstatus, signalname)
def trace_signal(pid, flags, tricklist, sig):
if not _signal_weedout_mask[sig]:
return sig
signalname = signalmap.lookup_name(sig)
# innermost trick gets first shot at the signal
tricklist = tricklist[:]
tricklist.reverse()
for trick, callmask, signalmask in tricklist:
if (not signalmask or signalmask.has_key(signalname))\
and trick.is_enabled(pid):
r = trick.signal(pid, signalname)
# r is None or (signal, )
if r != None:
assert len(r) == 1, "signal must return None or a 1-tuple"
signalname = r[0]
assert (isinstance(signalname, types.StringType)
and (0 <= signalmap.lookup_number(signalname)
< signal.NSIG)), \
"bad signal %s; must use signal name" % signalname
if signalname == 'SIG_0':
break
# XXX: perhaps we ought to also ignore signals that the
# process is ignoring ??
return signalmap.lookup_number(signalname)
def trace_exit(pid, flags, tricklist, exitstatus, termsig):
signalname = None
if termsig:
signalname = signalmap.lookup_name(termsig)
for trick, callmask, signalmask in tricklist:
if trick.is_enabled(pid):
trick.exit(pid, exitstatus, signalname)
def handle_sf_signal(signo, frame, tricks):
"""Send a signal received by sf itself to the interested tricks."""
# discard frame -- it's not part of the interface because this may be
# reimplemented in another language
signal = signalmap.lookup_name(signo)
for trick in tricks:
assert not trick.tricksignalmask \
or trick.tricksignalmask().has_key(signal)
trick.tricksignal(signal)
def handle_sf_signal(signo, frame, tricks):
"""Send a signal received by sf itself to the interested tricks."""
# discard frame -- it's not part of the interface because this may be
# reimplemented in another language
signal = signalmap.lookup_name(signo)
for trick in tricks:
assert not trick.tricksignalmask \
or trick.tricksignalmask().has_key(signal)
trick.tricksignal(signal)
if waitchannelhack:
callstop = _subterfugue.atcallstop(wpid, stopsig)
else:
callstop = stopsig == signal.SIGTRAP | 0x80
if not callstop:
sig = trace_signal(wpid, flags, tricklist, stopsig)
if (sig == signal.SIGSTOP or sig == signal.SIGTSTP
or sig == signal.SIGTTIN or sig == signal.SIGTTOU):
# FIX: more needed for ~SIGSTOP case
# ~SIGSTOP: if handler, pass like any other signal
# ~SIGSTOP: if IGN or DEF & orphaned pgrp, ignore
# all: stop
# all: if parent's SIGCHLD has !SA_NOCLDSTOP, notify
if sig != signal.SIGSTOP:
signame = signalmap.lookup_name(sig)
handler = flags.get(signame, signal.SIG_DFL)
if handler == signal.SIG_DFL:
pass # FIX: handle orphaned pgrp
elif handler == signal.SIG_IGN:
ptrace.syscall(wpid, 0)
continue
else:
# XXX: it would seem that we could get a duplicate
# signal here, since the kernel will report this
# twice (?), but this doesn't seem to be happening
# (maybe because the signals merge?)
ptrace.syscall(wpid, sig)
continue
if flags.has_key('status'):
if waitchannelhack:
callstop = _subterfugue.atcallstop(wpid, stopsig)
else:
callstop = stopsig == signal.SIGTRAP | 0x80
if not callstop:
sig = trace_signal(wpid, flags, tricklist, stopsig)
if (sig == signal.SIGSTOP or sig == signal.SIGTSTP
or sig == signal.SIGTTIN or sig == signal.SIGTTOU):
# FIX: more needed for ~SIGSTOP case
# ~SIGSTOP: if handler, pass like any other signal
# ~SIGSTOP: if IGN or DEF & orphaned pgrp, ignore
# all: stop
# all: if parent's SIGCHLD has !SA_NOCLDSTOP, notify
if sig != signal.SIGSTOP:
signame = signalmap.lookup_name(sig)
handler = flags.get(signame, signal.SIG_DFL)
if handler == signal.SIG_DFL:
pass # FIX: handle orphaned pgrp
elif handler == signal.SIG_IGN:
ptrace.syscall(wpid, 0)
continue
else:
# XXX: it would seem that we could get a duplicate
# signal here, since the kernel will report this
# twice (?), but this doesn't seem to be happening
# (maybe because the signals merge?)
ptrace.syscall(wpid, sig)
continue
if flags.has_key('status'):