I am modifying a commandline tool that is interactive (like ftp ) How Can I write a thread that logs all stdin and stdout so the thread doesnt block the process (async) ?
thx.
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you can redirect stdout to a file, via dup2(2) and open(2), stdin, not sure what you mean, you can just log that to a file too – Ryan Nov 17 '16 at 04:23
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what about stdin ? – Victor Nov 17 '16 at 04:24
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u can also dup2 stdin, but what would be the point? – Ryan Nov 17 '16 at 04:25
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just security/logging activity of like ftp – Victor Nov 17 '16 at 04:25
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there are questions for c++ but not for C/dup – Victor Nov 17 '16 at 04:27
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Why not just use `tee input.txt | ./myprogram | tee output.txt` – paddy Nov 17 '16 at 04:27
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cant use tee. It needs to be a C code – Victor Nov 17 '16 at 04:29
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http://stackoverflow.com/questions/1761950/how-can-i-implement-tee-programmatically-in-c is a process not a thread – Victor Nov 17 '16 at 04:31
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Why not use the `script` command to make a transcript of your session? – Barmar Nov 17 '16 at 04:38
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You probably need to look at pseudo-ttys (ptys). These are what `expect` uses, for example, to fool the program into thinking it is connected to a terminal, so that output is not unreasonably buffered, etc. – Jonathan Leffler Nov 17 '16 at 04:39
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@JonathanLeffler is there any examples of running ptys in a thread to log stdin and stdout ? – Victor Nov 17 '16 at 05:18
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Have you tried searching among the 200+ questions tagged [tag:pty] on SO? – Jonathan Leffler Nov 17 '16 at 05:20