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1 #!/usr/bin/env python | 1 #!/usr/bin/env python |
2 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | 2 # Copyright (c) 2012 The Chromium Authors. All rights reserved. |
3 # Use of this source code is governed by a BSD-style license that can be | 3 # Use of this source code is governed by a BSD-style license that can be |
4 # found in the LICENSE file. | 4 # found in the LICENSE file. |
5 | 5 |
6 """Waits for the go signal and replaces itself with the command to be run. | 6 """Waits for the go signal and replaces itself with the command to be run. |
cmp
2012/06/04 22:15:34
This should be updated now that on windows it does
M-A Ruel
2012/06/04 23:18:06
Thanks, also added comment about 'why' it is used.
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7 | 7 |
8 Not meant to be used directly, only meant to be used by trace_inputs.py. | 8 Not meant to be used directly, only meant to be used by trace_inputs.py. |
9 """ | 9 """ |
10 | 10 |
11 import os | |
12 import subprocess | 11 import subprocess |
13 import sys | 12 import sys |
14 | 13 |
15 | 14 |
16 def main(): | 15 def main(): |
17 signal = 'Go!' | |
18 value = sys.stdin.read(len(signal)) | |
19 assert value == signal | |
20 sys.stdin.close() | |
21 # Replace the executable with an absolute path to make it easier to grok. | |
22 cmd = sys.argv[1:] | 16 cmd = sys.argv[1:] |
23 cmd[0] = os.path.abspath(cmd[0]) | 17 if sys.argv[1] == '--wait': |
24 if cmd[0].endswith('.py'): | 18 cmd = cmd[1:] |
25 cmd.insert(0, sys.executable) | 19 signal = 'Go!' |
26 p = subprocess.Popen(cmd) | 20 value = sys.stdin.read(len(signal)) |
27 #print 'Child pid: %d' % p.pid | 21 assert value == signal |
28 p.wait() | 22 sys.stdin.close() |
29 return p.returncode | 23 |
24 # The reason os.execve() is not used is that we don't want the modules | |
25 # imported here to influence the executable being traced, so we need a fresh | |
26 # pid and need to fork. | |
27 return subprocess.call(cmd) | |
30 | 28 |
31 | 29 |
32 if __name__ == '__main__': | 30 if __name__ == '__main__': |
33 sys.exit(main()) | 31 sys.exit(main()) |
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