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ioctl(FIONREAD) doesn't return bytes in pipe
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 ioctl(FIONREAD) doesn't return bytes in pipe - Jul. 12, '06, 3:16:34 PM
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gregmb
Posts: 27
Status: offline
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When I use ioctl(pipefd, FIONREAD, &bytes)
it always returns Zero even though I just wrote x bytes into the write side of the pipe.
Is this a know bug?
Greg
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RE: ioctl(FIONREAD) doesn't return bytes in pipe - Jul. 12, '06, 3:36:04 PM
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gregmb
Posts: 27
Status: offline
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further investigate show that the ioctl() returns an error reporting 'Invalid Argument'
which I seems to be the pipe fd.
Is there some other way to get the number of bytes in a pipe?
Greg
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RE: ioctl(FIONREAD) doesn't return bytes in pipe - Jul. 12, '06, 3:48:45 PM
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Rodney
Posts: 3714
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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The only ioctl() supported for pipes is FIONBIO on 3.5
I don't know if this has changed for later versions.
You can use select() to indicate whether something is available to be read.
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RE: ioctl(FIONREAD) doesn't return bytes in pipe - Jul. 12, '06, 10:54:21 PM
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markfunk
Posts: 670
Joined: Mar. 31, '03,
Status: offline
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As far as I remember, there is no way to determine the number of bytes
currently in the pipe.
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