Linux 上的 Python 从管道读取行

发布于 2024-11-11 04:01:17 字数 364 浏览 4 评论 0原文

当使用 os.pipe() 创建管道时，它返回 2 个文件号；一个读端和一个写端，可以通过os.write()/os.read()进行写入和读取；没有 os.readline()。可以使用readline吗？

import os
readEnd, writeEnd = os.pipe()
# something somewhere writes to the pipe
firstLine = readEnd.readline() #doesn't work; os.pipe returns just fd numbers

简而言之，当您只有文件句柄号时，是否可以使用 readline ？

原文

When creating a pipe with os.pipe() it returns 2 file numbers; a read end and a write end which can be written to and read form with os.write()/os.read(); there is no os.readline(). Is it possible to use readline?

import os
readEnd, writeEnd = os.pipe()
# something somewhere writes to the pipe
firstLine = readEnd.readline() #doesn't work; os.pipe returns just fd numbers

In short, is it possible to use readline when all you have is the file handle number?

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℡Ms空城旧梦 2024-11-18 04:01:17

您可以使用 os.fdopen() 从文件描述符中获取类文件对象。

import os
readEnd, writeEnd = os.pipe()
readFile = os.fdopen(readEnd)
firstLine = readFile.readline()

You can use os.fdopen() to get a file-like object from a file descriptor.

import os
readEnd, writeEnd = os.pipe()
readFile = os.fdopen(readEnd)
firstLine = readFile.readline()

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十级心震 2024-11-18 04:01:17

将管道从 os.pipe() 传递到 os.fdopen()，它应该从文件描述符构建一个文件对象。

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裸钻 2024-11-18 04:01:17

听起来您想获取一个文件描述符（数字）并将其转换为文件对象。 fdopen 函数应该做到这一点：

import os
readEnd, writeEnd = os.pipe()
readFile = os.fdopen(readEnd)
# something somewhere writes to the pipe
firstLine = readFile.readline()

现在无法测试，如果不起作用请告诉我。

It sounds like you want to take a file descriptor (number) and turn it into a file object. The fdopen function should do that:

import os
readEnd, writeEnd = os.pipe()
readFile = os.fdopen(readEnd)
# something somewhere writes to the pipe
firstLine = readFile.readline()

Can't test this right now so let me know if it doesn't work.

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夕嗳→ 2024-11-18 04:01:17

os.pipe() 返回文件描述符，因此您必须像这样包装它们：

readF = os.fdopen(readEnd)
line = readF.readline()

有关更多详细信息，请参阅 http://docs.python.org/library/os.html#os.fdopen

os.pipe() returns file descriptors, so you have to wrap them like this:

readF = os.fdopen(readEnd)
line = readF.readline()

For more details see http://docs.python.org/library/os.html#os.fdopen

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萌面超妹 2024-11-18 04:01:17

我知道这是一个老问题，但这是一个不会陷入僵局的版本。

import os, threading

def Writer(pipe, data):
    pipe.write(data)
    pipe.flush()


readEnd, writeEnd = os.pipe()
readFile = os.fdopen(readEnd)
writeFile = os.fdopen(writeEnd, "w")

thread = threading.Thread(target=Writer, args=(writeFile,"one line\n"))
thread.start()
firstLine = readFile.readline()
print firstLine
thread.join()

I know this is an old question, but here is a version that doesn't deadlock.

import os, threading

def Writer(pipe, data):
    pipe.write(data)
    pipe.flush()


readEnd, writeEnd = os.pipe()
readFile = os.fdopen(readEnd)
writeFile = os.fdopen(writeEnd, "w")

thread = threading.Thread(target=Writer, args=(writeFile,"one line\n"))
thread.start()
firstLine = readFile.readline()
print firstLine
thread.join()

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~没有更多了~