shell可能会生成“Segmentation fault”消息.要找出该过程是否被SIGSEGV杀死,请检查proc.returncode == -signal.SIGSEGV.
如果要查看消息,可以在shell中运行该命令：
#!/usr/bin/env python
from subprocess import Popen, PIPE
proc = Popen(shell_command, shell=True, stdout=PIPE, stderr=PIPE)
out, err = proc.communicate()
print out, err, proc.returncode
我已经用ctypes import *; memset(0,1,1)’中的shell_command =“python -c”测试了它,导致了段错误并且错误捕获了消息.
如果消息直接打印到终端,那么您可以使用pexpect模块捕获它：
#!/usr/bin/env python
from pipes import quote
from pexpect import run # $pip install pexpect
out, returncode = run("sh -c " + quote(shell_command), withexitstatus=1)
signal = returncode - 128 # 128+n
print out, signal
或直接使用pty stdlib模块：
#!/usr/bin/env python
import os
import pty
from select import select
from subprocess import Popen, STDOUT
# use pseudo-tty to capture output printed directly to the terminal
master_fd, slave_fd = pty.openpty()
p = Popen(shell_command, shell=True, stdin=slave_fd, stdout=slave_fd,
stderr=STDOUT, close_fds=True)
buf = []
while True:
if select([master_fd], [], [], 0.04)[0]: # has something to read
data = os.read(master_fd, 1 << 20)
if data:
buf.append(data)
else: # EOF
break
elif p.poll() is not None: # process is done
assert not select([master_fd], [], [], 0)[0] # nothing to read
break
os.close(slave_fd)
os.close(master_fd)
print "".join(buf), p.returncode-128
