Created
August 21, 2013 18:52
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| import subprocess | |
| import signal | |
| def pipeline(cmds, first_stdin=None, last_stdout=None): | |
| """Pipe together programs using subprocess""" | |
| pcount = len(cmds) | |
| plist = [] | |
| for i, cmd in enumerate(cmds): | |
| stdin = None | |
| stdout = None | |
| stderr = None | |
| if i == 0: | |
| #First process | |
| stdin = first_stdin | |
| else: | |
| stdin = plist[i-1].stdout | |
| if i == len(cmds) - 1: | |
| #Last process | |
| stdout = last_stdout | |
| else: | |
| stdout = subprocess.PIPE | |
| #print cmd, stdin, stdout | |
| plist.append(subprocess.Popen(cmd, close_fds=True, stdin=stdin, stdout=stdout, preexec_fn=lambda: signal.signal(signal.SIGPIPE, signal.SIG_DFL))) | |
| ret = plist | |
| #for proc in ret: | |
| # print proc, proc.stdin, proc.stdout | |
| return ret | |
| #------------------- | |
| import os | |
| import sys | |
| def test(argv): | |
| procs = pipeline([['/bin/echo', 'hello\nthere'], ['/bin/grep', 'hel']])[-1].wait() | |
| procs = pipeline([['/bin/echo', 'end\nof\nworld'], ['/bin/grep', 'wor']])[-1].wait() | |
| return 0 | |
| if __name__ == '__main__': | |
| sys.exit(test(sys.argv)) |
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