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23 lines
733 B
23 lines
733 B
#!/usr/bin/env python
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# -*- encoding: utf8 -*-
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import os, sys
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print "I'm going to fork now - the child will write something to a pipe, and the parent will read it back"
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r, w = os.pipe() # r,w是文件描述符, 不是文件对象
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pid = os.fork()
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if pid:
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# 父进程
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os.close(w) # 关闭一个文件描述符
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r = os.fdopen(r) # 将r转化为文件对象
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print "parent: reading"
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txt = r.read()
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os.waitpid(pid, 0) # 确保子进程被撤销
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else:
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# 子进程
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os.close(r)
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w = os.fdopen(w, 'w')
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print "child: writing"
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w.write("here's some text from the child")
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w.close()
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print "child: closing"
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sys.exit(0)
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print "parent: got it; text =", txt
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