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da286666b2
os.fdopen() calls unbuffered. I presume that it's enough if we can make all three of them (for stdin, stdout, and stderr) unbuffered and don't need to specify different buffer sizes per file -- that would complicate the interface more than I care for.
99 lines
2.2 KiB
Python
99 lines
2.2 KiB
Python
import os
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import sys
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import string
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MAXFD = 256 # Max number of file descriptors (os.getdtablesize()???)
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_active = []
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def _cleanup():
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for inst in _active[:]:
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inst.poll()
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class Popen3:
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def __init__(self, cmd, capturestderr=0, bufsize=-1):
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if type(cmd) == type(''):
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cmd = ['/bin/sh', '-c', cmd]
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p2cread, p2cwrite = os.pipe()
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c2pread, c2pwrite = os.pipe()
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if capturestderr:
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errout, errin = os.pipe()
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self.pid = os.fork()
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if self.pid == 0:
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# Child
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os.close(0)
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os.close(1)
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if os.dup(p2cread) <> 0:
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sys.stderr.write('popen2: bad read dup\n')
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if os.dup(c2pwrite) <> 1:
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sys.stderr.write('popen2: bad write dup\n')
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if capturestderr:
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os.close(2)
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if os.dup(errin) <> 2: pass
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for i in range(3, MAXFD):
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try:
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os.close(i)
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except: pass
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try:
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os.execvp(cmd[0], cmd)
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finally:
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os._exit(1)
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# Shouldn't come here, I guess
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os._exit(1)
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os.close(p2cread)
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self.tochild = os.fdopen(p2cwrite, 'w', bufsize)
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os.close(c2pwrite)
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self.fromchild = os.fdopen(c2pread, 'r', bufsize)
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if capturestderr:
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os.close(errin)
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self.childerr = os.fdopen(errout, 'r', bufsize)
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else:
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self.childerr = None
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self.sts = -1 # Child not completed yet
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_active.append(self)
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def poll(self):
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if self.sts < 0:
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try:
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pid, sts = os.waitpid(self.pid, os.WNOHANG)
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if pid == self.pid:
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self.sts = sts
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_active.remove(self)
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except os.error:
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pass
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return self.sts
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def wait(self):
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pid, sts = os.waitpid(self.pid, 0)
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if pid == self.pid:
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self.sts = sts
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_active.remove(self)
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return self.sts
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def popen2(cmd, bufsize=-1):
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_cleanup()
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inst = Popen3(cmd, 0, bufsize)
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return inst.fromchild, inst.tochild
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def popen3(cmd, bufsize=-1):
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_cleanup()
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inst = Popen3(cmd, 1, bufsize)
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return inst.fromchild, inst.tochild, inst.childerr
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def _test():
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teststr = "abc\n"
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print "testing popen2..."
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r, w = popen2('cat')
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w.write(teststr)
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w.close()
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assert r.read() == teststr
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print "testing popen3..."
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r, w, e = popen3(['cat'])
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w.write(teststr)
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w.close()
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assert r.read() == teststr
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assert e.read() == ""
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_cleanup()
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assert not _active
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print "All OK"
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if __name__ == '__main__':
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_test()
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