В Sun, 18 Sep 2011 22:02:51 +0200 Gert Doering <g...@greenie.muc.de> пишет:
> Hi, > > On Sun, Sep 18, 2011 at 10:58:23PM +0400, Alexander Gordeev wrote: > > BTW you shouldn't even expect to read() 6 bytes from file at once. > > For normal files, read() will never read less than requested, unless you > hit an error or eof. Right. But then user decides to make a named pipe instead of a normal file, then the program fails. I meant something like this. > > $ strace -f -e trace=read,write sh -c 'dd if=/dev/urandom bs=1 count=6 > > | cat > /dev/null' > > /dev/urandom is not a *file*... > > > cat tries to read 32768 but gets 1 byte on every read. > > ... and cat does not read from /dev/urandom in the first place here, but > from the pipe from dd. It was primarily an example of read() from pipe behaviour. /dev/urandom was chosen randomly. :) -- Alexander
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