libbio brdline function error

[8080paco]

How to handle error result of read function? This is example of them.
I wonder why there is no code to handle the error.  

[sqweek]

The bio(3) man page includes the following:

> Brdline returns a pointer to the start of the line or 0 on end-of-file or read error

And later in the DIAGNOSTICS section:

> All routines set errstr on error.

In plan9 proper I presume errstr is set via `read`/`pread`. In the case of plan9port the unix syscall obviously is not going to set errstr, but it will set errno so I think this is your answer -- if Brdline returns 0 then:

(a) go and check errno to see what went wrong, or

(b) go and call errstr() to see what went wrong

The latter is still possible in plan9port because its errstr() function also considers the unix errno state.

HTH,

-sqweek

On Fri, 10 Nov 2023 at 16:20, 8080paco <ghwn...@gmail.com> wrote:

How to handle error result of read function? This is example of them.
I wonder why there is no code to handle the error.  

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[8080paco]

Thanks for your reply.

Then why not set "inactive" state of buffer?
bread function is handled that case.