author | jjkang |
Fri, 11 Jun 2010 15:22:40 +0800 | |
changeset 2 | 9da1e5517a66 |
parent 0 | ae805ac0140d |
permissions | -rw-r--r-- |
0
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1 |
"""Spawn a command with pipes to its stdin, stdout, and optionally stderr. |
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The normal os.popen(cmd, mode) call spawns a shell command and provides a |
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file interface to just the input or output of the process depending on |
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whether mode is 'r' or 'w'. This module provides the functions popen2(cmd) |
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and popen3(cmd) which return two or three pipes to the spawned command. |
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""" |
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import os |
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import sys |
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|
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__all__ = ["popen2", "popen3", "popen4"] |
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|
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try: |
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MAXFD = os.sysconf('SC_OPEN_MAX') |
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except (AttributeError, ValueError): |
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MAXFD = 256 |
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_active = [] |
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def _cleanup(): |
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for inst in _active[:]: |
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if inst.poll(_deadstate=sys.maxint) >= 0: |
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try: |
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_active.remove(inst) |
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except ValueError: |
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# This can happen if two threads create a new Popen instance. |
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# It's harmless that it was already removed, so ignore. |
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pass |
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class Popen3: |
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"""Class representing a child process. Normally instances are created |
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by the factory functions popen2() and popen3().""" |
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|
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sts = -1 # Child not completed yet |
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def __init__(self, cmd, capturestderr=False, bufsize=-1): |
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"""The parameter 'cmd' is the shell command to execute in a |
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sub-process. On UNIX, 'cmd' may be a sequence, in which case arguments |
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will be passed directly to the program without shell intervention (as |
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with os.spawnv()). If 'cmd' is a string it will be passed to the shell |
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(as with os.system()). The 'capturestderr' flag, if true, specifies |
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that the object should capture standard error output of the child |
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process. The default is false. If the 'bufsize' parameter is |
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specified, it specifies the size of the I/O buffers to/from the child |
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process.""" |
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_cleanup() |
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self.cmd = 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.dup2(p2cread, 0) |
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os.dup2(c2pwrite, 1) |
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if capturestderr: |
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os.dup2(errin, 2) |
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self._run_child(cmd) |
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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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|
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def __del__(self): |
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# In case the child hasn't been waited on, check if it's done. |
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self.poll(_deadstate=sys.maxint) |
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if self.sts < 0: |
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if _active is not None: |
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# Child is still running, keep us alive until we can wait on it. |
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_active.append(self) |
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|
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def _run_child(self, cmd): |
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if isinstance(cmd, basestring): |
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cmd = ['/bin/sh', '-c', cmd] |
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for i in xrange(3, MAXFD): |
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try: |
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os.close(i) |
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85 |
except OSError: |
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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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|
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def poll(self, _deadstate=None): |
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"""Return the exit status of the child process if it has finished, |
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or -1 if it hasn't finished yet.""" |
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95 |
if self.sts < 0: |
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96 |
try: |
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pid, sts = os.waitpid(self.pid, os.WNOHANG) |
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# pid will be 0 if self.pid hasn't terminated |
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99 |
if pid == self.pid: |
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100 |
self.sts = sts |
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101 |
except os.error: |
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102 |
if _deadstate is not None: |
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103 |
self.sts = _deadstate |
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104 |
return self.sts |
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105 |
|
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106 |
def wait(self): |
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107 |
"""Wait for and return the exit status of the child process.""" |
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108 |
if self.sts < 0: |
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109 |
pid, sts = os.waitpid(self.pid, 0) |
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110 |
# This used to be a test, but it is believed to be |
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111 |
# always true, so I changed it to an assertion - mvl |
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112 |
assert pid == self.pid |
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113 |
self.sts = sts |
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114 |
return self.sts |
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115 |
|
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116 |
|
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117 |
class Popen4(Popen3): |
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118 |
childerr = None |
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119 |
|
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120 |
def __init__(self, cmd, bufsize=-1): |
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121 |
_cleanup() |
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122 |
self.cmd = cmd |
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|
123 |
p2cread, p2cwrite = os.pipe() |
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124 |
c2pread, c2pwrite = os.pipe() |
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|
125 |
self.pid = os.fork() |
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126 |
if self.pid == 0: |
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|
127 |
# Child |
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128 |
os.dup2(p2cread, 0) |
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129 |
os.dup2(c2pwrite, 1) |
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130 |
os.dup2(c2pwrite, 2) |
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131 |
self._run_child(cmd) |
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132 |
os.close(p2cread) |
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|
133 |
self.tochild = os.fdopen(p2cwrite, 'w', bufsize) |
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134 |
os.close(c2pwrite) |
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|
135 |
self.fromchild = os.fdopen(c2pread, 'r', bufsize) |
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|
136 |
|
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|
137 |
|
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|
138 |
if sys.platform[:3] == "win" or sys.platform == "os2emx": |
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|
139 |
# Some things don't make sense on non-Unix platforms. |
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|
140 |
del Popen3, Popen4 |
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|
141 |
|
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|
142 |
def popen2(cmd, bufsize=-1, mode='t'): |
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|
143 |
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' may |
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|
144 |
be a sequence, in which case arguments will be passed directly to the |
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|
145 |
program without shell intervention (as with os.spawnv()). If 'cmd' is a |
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|
146 |
string it will be passed to the shell (as with os.system()). If |
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|
147 |
'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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|
148 |
file objects (child_stdout, child_stdin) are returned.""" |
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|
149 |
w, r = os.popen2(cmd, mode, bufsize) |
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|
150 |
return r, w |
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|
151 |
|
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152 |
def popen3(cmd, bufsize=-1, mode='t'): |
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|
153 |
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' may |
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|
154 |
be a sequence, in which case arguments will be passed directly to the |
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|
155 |
program without shell intervention (as with os.spawnv()). If 'cmd' is a |
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|
156 |
string it will be passed to the shell (as with os.system()). If |
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|
157 |
'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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|
158 |
file objects (child_stdout, child_stdin, child_stderr) are returned.""" |
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|
159 |
w, r, e = os.popen3(cmd, mode, bufsize) |
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|
160 |
return r, w, e |
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|
161 |
|
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|
162 |
def popen4(cmd, bufsize=-1, mode='t'): |
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|
163 |
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' may |
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|
164 |
be a sequence, in which case arguments will be passed directly to the |
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|
165 |
program without shell intervention (as with os.spawnv()). If 'cmd' is a |
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|
166 |
string it will be passed to the shell (as with os.system()). If |
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|
167 |
'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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|
168 |
file objects (child_stdout_stderr, child_stdin) are returned.""" |
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|
169 |
w, r = os.popen4(cmd, mode, bufsize) |
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|
170 |
return r, w |
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|
171 |
else: |
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|
172 |
def popen2(cmd, bufsize=-1, mode='t'): |
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|
173 |
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' may |
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|
174 |
be a sequence, in which case arguments will be passed directly to the |
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|
175 |
program without shell intervention (as with os.spawnv()). If 'cmd' is a |
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|
176 |
string it will be passed to the shell (as with os.system()). If |
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|
177 |
'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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|
178 |
file objects (child_stdout, child_stdin) are returned.""" |
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|
179 |
inst = Popen3(cmd, False, bufsize) |
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|
180 |
return inst.fromchild, inst.tochild |
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|
181 |
|
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|
182 |
def popen3(cmd, bufsize=-1, mode='t'): |
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|
183 |
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' may |
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|
184 |
be a sequence, in which case arguments will be passed directly to the |
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|
185 |
program without shell intervention (as with os.spawnv()). If 'cmd' is a |
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|
186 |
string it will be passed to the shell (as with os.system()). If |
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|
187 |
'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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|
188 |
file objects (child_stdout, child_stdin, child_stderr) are returned.""" |
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|
189 |
inst = Popen3(cmd, True, bufsize) |
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|
190 |
return inst.fromchild, inst.tochild, inst.childerr |
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|
191 |
|
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|
192 |
def popen4(cmd, bufsize=-1, mode='t'): |
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|
193 |
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' may |
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|
194 |
be a sequence, in which case arguments will be passed directly to the |
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|
195 |
program without shell intervention (as with os.spawnv()). If 'cmd' is a |
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|
196 |
string it will be passed to the shell (as with os.system()). If |
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|
197 |
'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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|
198 |
file objects (child_stdout_stderr, child_stdin) are returned.""" |
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|
199 |
inst = Popen4(cmd, bufsize) |
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|
200 |
return inst.fromchild, inst.tochild |
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|
201 |
|
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|
202 |
__all__.extend(["Popen3", "Popen4"]) |
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|
203 |
|
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|
204 |
def _test(): |
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|
205 |
# When the test runs, there shouldn't be any open pipes |
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|
206 |
_cleanup() |
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|
207 |
assert not _active, "Active pipes when test starts " + repr([c.cmd for c in _active]) |
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|
208 |
cmd = "cat" |
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|
209 |
teststr = "ab cd\n" |
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|
210 |
if os.name == "nt": |
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|
211 |
cmd = "more" |
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|
212 |
# "more" doesn't act the same way across Windows flavors, |
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|
213 |
# sometimes adding an extra newline at the start or the |
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|
214 |
# end. So we strip whitespace off both ends for comparison. |
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|
215 |
expected = teststr.strip() |
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|
216 |
print "testing popen2..." |
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|
217 |
r, w = popen2(cmd) |
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|
218 |
w.write(teststr) |
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|
219 |
w.close() |
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|
220 |
got = r.read() |
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|
221 |
if got.strip() != expected: |
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|
222 |
raise ValueError("wrote %r read %r" % (teststr, got)) |
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|
223 |
print "testing popen3..." |
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|
224 |
try: |
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|
225 |
r, w, e = popen3([cmd]) |
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|
226 |
except: |
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|
227 |
r, w, e = popen3(cmd) |
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|
228 |
w.write(teststr) |
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|
229 |
w.close() |
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|
230 |
got = r.read() |
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|
231 |
if got.strip() != expected: |
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|
232 |
raise ValueError("wrote %r read %r" % (teststr, got)) |
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|
233 |
got = e.read() |
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|
234 |
if got: |
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|
235 |
raise ValueError("unexpected %r on stderr" % (got,)) |
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|
236 |
for inst in _active[:]: |
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|
237 |
inst.wait() |
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|
238 |
_cleanup() |
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|
239 |
if _active: |
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diff
changeset
|
240 |
raise ValueError("_active not empty") |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
241 |
print "All OK" |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
242 |
|
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
243 |
if __name__ == '__main__': |
ae805ac0140d
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
244 |
_test() |