def write(self, fd, databyte, pid):
self.add_selfpid(pid)
if not self.getproc(pid).fd_map.contains(fd):
return {'r': -1, 'errno': errno.EBADF}
if self.getproc(pid).fd_map[fd].ispipe:
if not self.getproc(pid).fd_map[fd].pipewriter:
return {'r': -1, 'errno': errno.EBADF}
pipeid = self.getproc(pid).fd_map[fd].pipeid
pipe = self.pipes[pipeid]
otherfd = SFdNum.var('otherfd')
if simsym.symnot(simsym.symor([
simsym.exists(otherfd,
simsym.symand([self.proc0.fd_map.contains(otherfd),
self.proc0.fd_map._map[otherfd].ispipe,
simsym.symnot(self.proc0.fd_map._map[otherfd].pipewriter),
self.proc0.fd_map._map[otherfd].pipeid == pipeid])),
simsym.exists(otherfd,
simsym.symand([self.proc1.fd_map.contains(otherfd),
self.proc1.fd_map._map[otherfd].ispipe,
simsym.symnot(self.proc1.fd_map._map[otherfd].pipewriter),
self.proc1.fd_map._map[otherfd].pipeid == pipeid]))])):
# XXX This condition has the same problem as the one
# in read.
return {'r': -1, 'errno': errno.EPIPE}
simsym.assume(pipe.data.len() < DATA_MAX_LEN)
pipe.data.append(databyte)
return {'r': DATAVAL_BYTES}
off = self.getproc(pid).fd_map[fd].off
self.getproc(pid).fd_map[fd].off = off + 1
return self.iwrite(self.getproc(pid).fd_map[fd].inum, off, databyte)
def iused(self, inum):
dir = SInum.var('dir')
fn = SFn.var('fn')
fd = SFdNum.var('fd')
pid = SPid.var('pid')
# If we try to simply index into dirmap, its __getitem__
# won't have access to the supposition that it contains the right
# key, and throw an exception. Thus, we use _map directly.
return simsym.symor([
## XXX Directories impl:
# simsym.exists(dir,
# simsym.symand([
# self.i_map[dir].isdir,
# simsym.exists(fn,
# simsym.symand([self.i_map[dir].dirmap.contains(fn),
# self.i_map[dir].dirmap._map[fn] == inum]))])),
## XXX Non-directories impl:
simsym.exists(fn,
simsym.symand([self.root_dir.contains(fn),
self.root_dir._map[fn] == inum])),
simsym.exists(fd,
simsym.symand([self.proc0.fd_map.contains(fd),
simsym.symnot(self.proc0.fd_map._map[fd].ispipe),
self.proc0.fd_map._map[fd].inum == inum])),
simsym.exists(fd,
simsym.symand([self.proc1.fd_map.contains(fd),
simsym.symnot(self.proc1.fd_map._map[fd].ispipe),
self.proc1.fd_map._map[fd].inum == inum])),
])
def enqueue_proc_prio_queue(self, pid, pprio):
simsym.assume(pid >= NULLPROCREF)
simsym.assume(pid <= IDLEPROCREF)
simsym.assume(pprio >= 0)
simsym.assume(pprio <= MAXPROCS)
self.qprio.create(pid)
self.qprio[pid] = pprio
if procs_prev.empty(): # empty queue
procs_prev.create(pid)
procs_prev[pid] = NULLPROCREF
procs_next.create(pid)
procs_next[pid] = NULLPROCREF
else: # find the right place to add the new pid in
pcut = PRef.var()
simsym.assume(simsym.exists(pcut, symand(qprio.contains(pcut), symor(symand(qprio[pcut] >= pprio, symor(qprio[proces_prev[pcut]] < pprio, proces_prev[pcut] == NULLPROCREF), symand(qprio[pcut] <= pprio, symor(qprio[proces_next[pcut]] > pprio, proces_next[pcut] == NULLPROCREF)))))))
# find a process with higer priority
if qprio[proces_prev[pcut]] < pprio or proces_prev[pcut] == NULLPROCREF:
# --- < pid <= pcut <= ---
procs_prev.create(pid)
procs_prev[pid] = proces_prev[pcut]
procs_next.create(pid)
procs_next[pid] = pcut
proces_prev[pcut] = pid
# find a process with lower priority
else:
# --- <= pcut <= pid < ---
procs_next.create(pid)
procs_next[pid] = proces_next[pcut]
procs_prev.create(pid)
procs_prev[pid] = pcut
proces_next[pcut] = pid
def read(self, fd, pid):
self.add_selfpid(pid)
if not self.getproc(pid).fd_map.contains(fd):
return {'r': -1, 'errno': errno.EBADF}
if self.getproc(pid).fd_map[fd].ispipe:
if self.getproc(pid).fd_map[fd].pipewriter:
return {'r': -1, 'errno': errno.EBADF}
pipeid = self.getproc(pid).fd_map[fd].pipeid
pipe = self.pipes[pipeid]
if pipe.data.len() == 0:
otherfd = SFdNum.var('otherfd')
if simsym.symor([
simsym.exists(
otherfd,
simsym.symand([
self.proc0.fd_map.contains(otherfd),
self.proc0.fd_map._map[otherfd].ispipe,
self.proc0.fd_map._map[otherfd].pipewriter,
self.proc0.fd_map._map[otherfd].pipeid ==
pipeid
])),
simsym.exists(
otherfd,
simsym.symand([
self.proc1.fd_map.contains(otherfd),
self.proc1.fd_map._map[otherfd].ispipe,
self.proc1.fd_map._map[otherfd].pipewriter,
self.proc1.fd_map._map[otherfd].pipeid ==
pipeid
]))
]):
return {'r': -1, 'errno': errno.EAGAIN}
else:
# XXX The above condition can always be satisfied
# by making up some other FD, but testgen may
# never see that FD, so the real test may not
# reflect its presence.
return {'r': 0}
d = pipe.data[0]
pipe.data.shift()
return {'r': DATAVAL_BYTES, 'data': d}
off = self.getproc(pid).fd_map[fd].off
r = self.iread(self.getproc(pid).fd_map[fd].inum, off)
if 'data' in r:
self.getproc(pid).fd_map[fd].off = off + 1
return r
def pipe(self, pid):
self.add_selfpid(pid)
internal_pipeid = SPipeId.var('internal_pipeid*')
xfd = SFdNum.var('xfd')
simsym.assume(simsym.symnot(simsym.symor([
simsym.exists(xfd,
simsym.symand([self.proc0.fd_map.contains(xfd),
self.proc0.fd_map._map[xfd].ispipe,
self.proc0.fd_map._map[xfd].pipeid == internal_pipeid])),
simsym.exists(xfd,
simsym.symand([self.proc1.fd_map.contains(xfd),
self.proc1.fd_map._map[xfd].ispipe,
self.proc1.fd_map._map[xfd].pipeid == internal_pipeid]))])))
empty_pipe = self.pipes[internal_pipeid]
empty_pipe.data._len = 0
## lowest FD for read end
internal_fd_r = SFdNum.var('internal_fd_r*')
simsym.assume(internal_fd_r >= 0)
simsym.assume(simsym.symnot(self.getproc(pid).fd_map.contains(internal_fd_r)))
simsym.assume(simsym.symnot(simsym.exists(xfd,
simsym.symand([xfd >= 0,
xfd < internal_fd_r,
self.getproc(pid).fd_map.contains(xfd)]))))
fd_r_data = self.getproc(pid).fd_map.create(internal_fd_r)
fd_r_data.ispipe = True
fd_r_data.pipeid = internal_pipeid
fd_r_data.pipewriter = False
## lowest FD for write end
internal_fd_w = SFdNum.var('internal_fd_w*')
simsym.assume(internal_fd_w >= 0)
simsym.assume(simsym.symnot(self.getproc(pid).fd_map.contains(internal_fd_w)))
simsym.assume(simsym.symnot(simsym.exists(xfd,
simsym.symand([xfd >= 0,
xfd < internal_fd_w,
self.getproc(pid).fd_map.contains(xfd)]))))
fd_w_data = self.getproc(pid).fd_map.create(internal_fd_w)
fd_w_data.ispipe = True
fd_w_data.pipeid = internal_pipeid
fd_w_data.pipewriter = True
return {'r': 0, 'fds[0]': internal_fd_r, 'fds[1]': internal_fd_w}
def write(self, fd, databyte, pid):
self.add_selfpid(pid)
if not self.getproc(pid).fd_map.contains(fd):
return {'r': -1, 'errno': errno.EBADF}
if self.getproc(pid).fd_map[fd].ispipe:
if not self.getproc(pid).fd_map[fd].pipewriter:
return {'r': -1, 'errno': errno.EBADF}
pipeid = self.getproc(pid).fd_map[fd].pipeid
pipe = self.pipes[pipeid]
otherfd = SFdNum.var('otherfd')
if simsym.symnot(
simsym.symor([
simsym.exists(
otherfd,
simsym.symand([
self.proc0.fd_map.contains(otherfd),
self.proc0.fd_map._map[otherfd].ispipe,
simsym.symnot(self.proc0.fd_map._map[otherfd].
pipewriter),
self.proc0.fd_map._map[otherfd].pipeid ==
pipeid
])),
simsym.exists(
otherfd,
simsym.symand([
self.proc1.fd_map.contains(otherfd),
self.proc1.fd_map._map[otherfd].ispipe,
simsym.symnot(self.proc1.fd_map._map[otherfd].
pipewriter),
self.proc1.fd_map._map[otherfd].pipeid ==
pipeid
]))
])):
# XXX This condition has the same problem as the one
# in read.
return {'r': -1, 'errno': errno.EPIPE}
simsym.assume(pipe.data.len() < DATA_MAX_LEN)
pipe.data.append(databyte)
return {'r': DATAVAL_BYTES}
off = self.getproc(pid).fd_map[fd].off
self.getproc(pid).fd_map[fd].off = off + 1
return self.iwrite(self.getproc(pid).fd_map[fd].inum, off, databyte)
def open(self, pn, creat, excl, trunc, anyfd, pid):
# XXX O_RDONLY, O_WRONLY, O_RDWR
self.add_selfpid(pid)
internal_time = STime.var('internal_time*')
created = False
anyfd = False
_, pndirmap, pnlast = self.nameiparent(pn)
if creat:
if not pndirmap.contains(pnlast):
internal_alloc_inum = SInum.var('internal_alloc_inum*')
simsym.assume(simsym.symnot(self.iused(internal_alloc_inum)))
simsym.assume(internal_time >= self.i_map[internal_alloc_inum].atime)
simsym.assume(internal_time >= self.i_map[internal_alloc_inum].mtime)
simsym.assume(internal_time >= self.i_map[internal_alloc_inum].ctime)
inode = self.i_map[internal_alloc_inum]
inode.data._len = 0
inode.nlink = 1
inode.atime = inode.mtime = inode.ctime = internal_time
pndirmap[pnlast] = internal_alloc_inum
created = True
else:
if excl: return {'r': -1, 'errno': errno.EEXIST}
if not pndirmap.contains(pnlast):
return {'r': -1, 'errno': errno.ENOENT}
inum = pndirmap[pnlast]
if trunc:
if not created:
simsym.assume(internal_time >= self.i_map[inum].mtime)
simsym.assume(internal_time >= self.i_map[inum].ctime)
self.i_map[inum].mtime = internal_time
self.i_map[inum].ctime = internal_time
self.i_map[inum].data._len = 0
internal_ret_fd = SFdNum.var('internal_ret_fd*')
simsym.assume(internal_ret_fd >= 0)
simsym.assume(simsym.symnot(self.getproc(pid).fd_map.contains(internal_ret_fd)))
## Lowest FD
otherfd = SFdNum.var('fd')
simsym.assume(simsym.symor([anyfd,
simsym.symnot(simsym.exists(otherfd,
simsym.symand([otherfd >= 0,
otherfd < internal_ret_fd,
self.getproc(pid).fd_map.contains(otherfd)])))]))
fd_data = self.getproc(pid).fd_map.create(internal_ret_fd)
fd_data.inum = inum
fd_data.off = 0
fd_data.ispipe = False
return {'r': internal_ret_fd}
def next_from_proc_prio_queue(self):
simsym.assume
phead = PRef.var()
simsym.assume(simsym.exists(phead, procs_prev[phead] == NULLPROCREF))
if (procs_next[phead] != NULLPROCREF):
procs_prev[procs_next[phead]] = NULLPROCREF
# is this the correct way to delete an element from the tdict?
del procs_next[phead]
del procs_prev[phead]
del qprio[phead]
return phead;
def remove_element(self, x):
i = simsym.SInt.var()
simsym.assume(simsym.exists(i, simsym.symand(self.elts.len() > i, self.elts[i] == x)))
newElts = symtypes.tlist(simsym.SInt, APref).var()
k = simsym.SInt.var()
k = 0
while k < self.elts.len():
if k != i:
newElts.append(elts[k])
k = k + 1
self.elts = newElts
def iused(self, inum):
dir = SInum.var('dir')
fn = SFn.var('fn')
fd = SFdNum.var('fd')
pid = SPid.var('pid')
# If we try to simply index into dirmap, its __getitem__
# won't have access to the supposition that it contains the right
# key, and throw an exception. Thus, we use _map directly.
return simsym.symor([
## XXX Directories impl:
# simsym.exists(dir,
# simsym.symand([
# self.i_map[dir].isdir,
# simsym.exists(fn,
# simsym.symand([self.i_map[dir].dirmap.contains(fn),
# self.i_map[dir].dirmap._map[fn] == inum]))])),
## XXX Non-directories impl:
simsym.exists(
fn,
simsym.symand([
self.root_dir.contains(fn), self.root_dir._map[fn] == inum
])),
simsym.exists(
fd,
simsym.symand([
self.proc0.fd_map.contains(fd),
simsym.symnot(self.proc0.fd_map._map[fd].ispipe),
self.proc0.fd_map._map[fd].inum == inum
])),
simsym.exists(
fd,
simsym.symand([
self.proc1.fd_map.contains(fd),
simsym.symnot(self.proc1.fd_map._map[fd].ispipe),
self.proc1.fd_map._map[fd].inum == inum
])),
])
def read(self, fd, pid):
self.add_selfpid(pid)
if not self.getproc(pid).fd_map.contains(fd):
return {'r': -1, 'errno': errno.EBADF}
if self.getproc(pid).fd_map[fd].ispipe:
if self.getproc(pid).fd_map[fd].pipewriter:
return {'r': -1, 'errno': errno.EBADF}
pipeid = self.getproc(pid).fd_map[fd].pipeid
pipe = self.pipes[pipeid]
if pipe.data.len() == 0:
otherfd = SFdNum.var('otherfd')
if simsym.symor([
simsym.exists(otherfd,
simsym.symand([self.proc0.fd_map.contains(otherfd),
self.proc0.fd_map._map[otherfd].ispipe,
self.proc0.fd_map._map[otherfd].pipewriter,
self.proc0.fd_map._map[otherfd].pipeid == pipeid])),
simsym.exists(otherfd,
simsym.symand([self.proc1.fd_map.contains(otherfd),
self.proc1.fd_map._map[otherfd].ispipe,
self.proc1.fd_map._map[otherfd].pipewriter,
self.proc1.fd_map._map[otherfd].pipeid == pipeid]))]):
return {'r': -1, 'errno': errno.EAGAIN}
else:
# XXX The above condition can always be satisfied
# by making up some other FD, but testgen may
# never see that FD, so the real test may not
# reflect its presence.
return {'r': 0}
d = pipe.data[0]
pipe.data.shift()
return {'r': DATAVAL_BYTES, 'data': d}
off = self.getproc(pid).fd_map[fd].off
r = self.iread(self.getproc(pid).fd_map[fd].inum, off)
if 'data' in r:
self.getproc(pid).fd_map[fd].off = off + 1
return r
def do_callset(base, callset, test_writer):
print ' '.join([c.__name__ for c in callset])
test_writer.begin_call_set(callset)
reporter = progress.ProgressReporter(
' {0.npath} paths ({0.ncompath} commutative), {0.nmodel} testcases,' +
' {0.nerror} errors', test_writer)
condlists = collections.defaultdict(list)
terminated = False
diverged = set()
all_internals = []
for sar in simsym.symbolic_apply(test, base, *callset):
if sar.type == 'value':
is_commutative = (len(sar.value.diverge) == 0)
diverged.update(sar.value.diverge)
condlists[is_commutative].append(sar.path_condition)
all_internals.extend(sar.internals)
test_writer.on_result(sar)
if not test_writer.keep_going():
terminated = True
break
test_writer.end_call_set()
reporter.end()
if terminated:
print ' enumeration incomplete; skipping conditions'
return
conds = collections.defaultdict(lambda: [simsym.wrap(z3.BoolVal(False))])
for result, condlist in condlists.items():
conds[result] = condlist
if True in condlists:
commute = simsym.symor(condlists[True])
# Internal variables help deal with situations where, for the
# same assignment of initial state + external inputs, two
# operations both can commute and can diverge (depending on
# internal choice, like the inode number for file creation).
cannot_commute = simsym.symnot(simsym.exists(all_internals, commute))
print_cond('can commute', commute)
else:
cannot_commute = True
if False in condlists:
diverge = simsym.symor(condlists[False])
print_cond('can not commute; %s' % str_diverge(diverged),
simsym.symand([diverge, cannot_commute]))
def socket(self, domain, type, prot, anyfd, pid):
self.add_selfpid(pid)
if not ((domain == AF_INET or domain == AF_INET6)
and type == SOCK_DGRAM and prot == 0):
return {'r': -1, 'errno': errno.EAFNOSUPPORT}
internal_ret_fd = SFdNum.var('internal_ret_fd*')
simsym.assume(internal_ret_fd >= 0)
simsym.assume(
simsym.symnot(self.getproc(pid).fd_map.contains(internal_ret_fd)))
## Lowest FD
otherfd = SFdNum.var('fd')
simsym.assume(
simsym.symor([
anyfd,
simsym.symnot(
simsym.exists(
otherfd,
simsym.symand([
otherfd >= 0, otherfd < internal_ret_fd,
self.getproc(pid).fd_map.contains(otherfd)
])))
]))
sock = self.getproc(pid).fd_map.create(internal_ret_fd)
sock.domain = domain
sock.type = type
sock.prot = prot
sock.can_read = True
sock.can_write = True
sock.is_bound = False
sock.is_connected = False
sock.local_addr = 0
sock.local_port = 0
sock.remote_addr = 0
sock.remote_port = 0
return {'r': internal_ret_fd}
def open(self, pn, creat, excl, trunc, anyfd, pid):
# XXX O_RDONLY, O_WRONLY, O_RDWR
self.add_selfpid(pid)
internal_time = STime.var('internal_time*')
created = False
anyfd = False
_, pndirmap, pnlast = self.nameiparent(pn)
if creat:
if not pndirmap.contains(pnlast):
internal_alloc_inum = SInum.var('internal_alloc_inum*')
simsym.assume(simsym.symnot(self.iused(internal_alloc_inum)))
simsym.assume(
internal_time >= self.i_map[internal_alloc_inum].atime)
simsym.assume(
internal_time >= self.i_map[internal_alloc_inum].mtime)
simsym.assume(
internal_time >= self.i_map[internal_alloc_inum].ctime)
inode = self.i_map[internal_alloc_inum]
inode.data._len = 0
inode.nlink = 1
inode.atime = inode.mtime = inode.ctime = internal_time
pndirmap[pnlast] = internal_alloc_inum
created = True
else:
if excl: return {'r': -1, 'errno': errno.EEXIST}
if not pndirmap.contains(pnlast):
return {'r': -1, 'errno': errno.ENOENT}
inum = pndirmap[pnlast]
if trunc:
if not created:
simsym.assume(internal_time >= self.i_map[inum].mtime)
simsym.assume(internal_time >= self.i_map[inum].ctime)
self.i_map[inum].mtime = internal_time
self.i_map[inum].ctime = internal_time
self.i_map[inum].data._len = 0
internal_ret_fd = SFdNum.var('internal_ret_fd*')
simsym.assume(internal_ret_fd >= 0)
simsym.assume(
simsym.symnot(self.getproc(pid).fd_map.contains(internal_ret_fd)))
## Lowest FD
otherfd = SFdNum.var('fd')
simsym.assume(
simsym.symor([
anyfd,
simsym.symnot(
simsym.exists(
otherfd,
simsym.symand([
otherfd >= 0, otherfd < internal_ret_fd,
self.getproc(pid).fd_map.contains(otherfd)
])))
]))
fd_data = self.getproc(pid).fd_map.create(internal_ret_fd)
fd_data.inum = inum
fd_data.off = 0
fd_data.ispipe = False
return {'r': internal_ret_fd}
def test_callset(base, callset, monitors, check_conds=False, print_conds=False):
"""Test the SIM-commutativity of a call set.
base must be a class type for the system state. calls must be the
unbound methods of base to test for SIM commutativity. As the
test proceeds, this will invoke the appropriate methods of the
ExecutionMonitorBase instances in monitors. The caller is
responsible for calling the 'finish' method of the monitors after
all callsets are done.
If check_conds is true, check commutativity conditions for
sat/unsat and report this. If print_conds is true, print
commutativity conditions. If print_conds is "simplify", use
ctx-solver-simplify to further simplify conditions.
"""
monitor = MetaMonitor([StatMonitor()] + monitors)
print " ".join([c.__name__ for c in callset])
monitor.begin_call_set(callset)
reporter = progress.ProgressReporter(" " + monitor.get_progress_format(), monitor)
condlists = collections.defaultdict(list)
terminated = False
diverged = set()
all_internals = []
for sar in simsym.symbolic_apply(test, base, *callset):
if sar.type == "value":
is_commutative = len(sar.value.diverge) == 0
diverged.update(sar.value.diverge)
condlists[is_commutative].append(sar.path_condition)
all_internals.extend(sar.internals)
monitor.on_path(sar)
if monitor.stop_call_set():
terminated = True
break
monitor.end_call_set()
reporter.end()
if terminated:
print " enumeration incomplete; skipping conditions"
return
conds = collections.defaultdict(lambda: [simsym.wrap(z3.BoolVal(False))])
for result, condlist in condlists.items():
conds[result] = condlist
if True in condlists:
commute = simsym.symor(condlists[True])
# Internal variables help deal with situations where, for the
# same assignment of initial state + external inputs, two
# operations both can commute and can diverge (depending on
# internal choice, like the inode number for file creation).
cannot_commute = simsym.symnot(simsym.exists(all_internals, commute))
print_cond("can commute", commute, check_conds, print_conds)
else:
cannot_commute = True
if False in condlists:
diverge = simsym.symor(condlists[False])
print_cond(
"can not commute; %s" % ", ".join(map(str, diverged)),
simsym.symand([diverge, cannot_commute]),
check_conds,
print_conds,
)
projected_calls = list(calls)
for p in projections:
for c in calls:
projected_calls.append(projected_call(p, projections[p], c))
for callset in itertools.combinations_with_replacement(projected_calls, ncomb):
print ' '.join([c.__name__ for c in callset])
rvs = simsym.symbolic_apply(test, base, *callset)
conds = collections.defaultdict(lambda: simsym.wrap(z3.BoolVal(False)))
for cond, res in simsym.combine(rvs):
conds[res] = cond
pc = simsym.simplify(conds[''])
pr = simsym.simplify(simsym.symor([conds['r'], conds['rs']]))
ps = simsym.simplify(conds['s'])
ex_pc = simsym.exists(simsym.internals(), pc)
nex_pc = simsym.symnot(ex_pc)
print "nex_pc", nex_pc
ex_pr = simsym.exists(simsym.internals(), pr)
nex_pr = simsym.symnot(ex_pr)
ps2 = simsym.symand([ps, nex_pc, nex_pr])
ps_ex_pr = simsym.symand([ps, ex_pr])
pr2 = simsym.symand([simsym.symor([pr, ps_ex_pr]), nex_pc])
ps_ex_pc = simsym.symand([ps, ex_pc])
pr_ex_pc = simsym.symand([pr, ex_pc])
pc2 = simsym.symor([pc, ps_ex_pc, pr_ex_pc])
for msg, cond in (('commute', pc2),
('results diverge', pr2),
def _declare_assumptions(self, assume):
super(ProcessQueue, self)._declare_assumptions(assume)
# 'iseq' restriction
i = simsym.SInt.var()
j = simsym.SInt.var()
assume(simsym.symnot(simsym.exists(i, simsym.exists(j, simsym.symand(i != j, i >= 0, j >= 0, i < self.elts.len(), j < self.elts.len(), self.elts[i] == self.elts[j])))))
def pipe(self, pid):
self.add_selfpid(pid)
internal_pipeid = SPipeId.var('internal_pipeid*')
xfd = SFdNum.var('xfd')
simsym.assume(
simsym.symnot(
simsym.symor([
simsym.exists(
xfd,
simsym.symand([
self.proc0.fd_map.contains(xfd),
self.proc0.fd_map._map[xfd].ispipe,
self.proc0.fd_map._map[xfd].pipeid ==
internal_pipeid
])),
simsym.exists(
xfd,
simsym.symand([
self.proc1.fd_map.contains(xfd),
self.proc1.fd_map._map[xfd].ispipe,
self.proc1.fd_map._map[xfd].pipeid ==
internal_pipeid
]))
])))
empty_pipe = self.pipes[internal_pipeid]
empty_pipe.data._len = 0
## lowest FD for read end
internal_fd_r = SFdNum.var('internal_fd_r*')
simsym.assume(internal_fd_r >= 0)
simsym.assume(
simsym.symnot(self.getproc(pid).fd_map.contains(internal_fd_r)))
simsym.assume(
simsym.symnot(
simsym.exists(
xfd,
simsym.symand([
xfd >= 0, xfd < internal_fd_r,
self.getproc(pid).fd_map.contains(xfd)
]))))
fd_r_data = self.getproc(pid).fd_map.create(internal_fd_r)
fd_r_data.ispipe = True
fd_r_data.pipeid = internal_pipeid
fd_r_data.pipewriter = False
## lowest FD for write end
internal_fd_w = SFdNum.var('internal_fd_w*')
simsym.assume(internal_fd_w >= 0)
simsym.assume(
simsym.symnot(self.getproc(pid).fd_map.contains(internal_fd_w)))
simsym.assume(
simsym.symnot(
simsym.exists(
xfd,
simsym.symand([
xfd >= 0, xfd < internal_fd_w,
self.getproc(pid).fd_map.contains(xfd)
]))))
fd_w_data = self.getproc(pid).fd_map.create(internal_fd_w)
fd_w_data.ispipe = True
fd_w_data.pipeid = internal_pipeid
fd_w_data.pipewriter = True
return {'r': 0, 'fds[0]': internal_fd_r, 'fds[1]': internal_fd_w}
