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Re: builtin echo command redirection misbehaves in detached scripts when


From: Stephane Chazelas
Subject: Re: builtin echo command redirection misbehaves in detached scripts when terminal is closed
Date: Mon, 10 Sep 2007 18:36:51 +0100
User-agent: Mutt/1.5.16 (2007-06-11)

On Mon, Sep 10, 2007 at 09:25:26PM +0400, Dmitry Potapov wrote:
[...]
> > With dietlibc:
> > 
> > $ ./t
> > signal handler called, sig=2
> > writer: num_bytes=80008 num_lines=10001
> > writer: expected num_bytes=80000 but was 80008
> > reader: num_bytes=80007 num_lines=10000
> > reader: number of missing bytes: -7
> > 
> > And dietlibc behaves the same as glibc patched with your
> > (Dmitry's) change upon the fflush.
> 
> No, glibc with my patch gives:
[...]

Sorry for the misunderstanding, I meant "upon the fflush", as in
wrt the issue at stake, that is the fact that dietlibc doesn't
seem to empty the output buffer upon an unsuccessful fflush
either, which confirms what you suspected earlier through
reading the dietlibc code. I did not mean that "t" was behaving
the same in glibc and dietlibc. With the glibc, I obtain:

$ ~/t
signal handler called, sig=2
error at num_bytes=66560
fputs: Interrupted system call
reader: num_bytes=80000 num_lines=10000
writer: num_bytes=80000 num_lines=10000

And with your fix reverted:

.../glibc-2.6.1/build-tree/i386-libc$ LD_LIBRARY_PATH=$PWD ~/t
signal handler called, sig=2
error at num_bytes=66560
fputs: Interrupted system call
writer: num_bytes=80000 num_lines=10000
reader: num_bytes=78976 num_lines=9872
reader: number of missing bytes: 1024

as expected.

Best regards,
St├ęphane




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