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changed commit 22b272f3af
a bit
- only "fix" sys.stdout if it is no tty - make sys.stdout line buffered (to avoid too "many" write calls) - added more detailed explanation why this is needed
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22b272f3af
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@ -23,8 +23,18 @@ except NameError:
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pass
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# avoid buffering output on pipes (bnc#930137)
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if sys.stdout.name == '<stdout>':
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sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
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# Basically, a "print('foo')" call is translated to a corresponding
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# fwrite call that writes to the stdout stream (cf. string_print
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# (Objects/stringobject.c) and builtin_print (Python/bltinmodule.c));
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# If no pipe is used, stdout is a tty/refers to a terminal =>
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# the stream is line buffered (see _IO_file_doallocate (libio/filedoalloc.c)).
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# If a pipe is used, stdout does not refer to a terminal anymore =>
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# the stream is fully buffered by default (see _IO_file_doallocate).
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# The following fdopen call makes stdout line buffered again (at least on
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# systems that support setvbuf - if setvbuf is not supported, the stream
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# remains fully buffered (see PyFile_SetBufSize (Objects/fileobject.c))).
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if not os.isatty(sys.stdout.fileno()):
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sys.stdout = os.fdopen(sys.stdout.fileno(), sys.stdout.mode, 1)
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osccli = commandline.Osc()
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