topic Re: device or address that does exit error with name pipe in Operating System - HP-UX

device or address that does exit error with name pipe

Sup — Wed, 04 Jun 2003 14:51:35 GMT

I have two process which use named pipe for their communication. Sometimes I get following message
/tmp/named_pipe: There is a request to a device or address that does not exist.
both process are running ( not crashed ), The process which writes data to named pipe fails.

The open() system call failing with errono=6

Any ideas?

Re: device or address that does exit error with name pipe

Massimo Bianchi — Wed, 04 Jun 2003 15:37:37 GMT

HI,
is the named pipe unique for the program ?

May be the two program cannot run concurrently.

Massimo

Re: device or address that does exit error with name pipe

Umapathy S — Wed, 04 Jun 2003 16:20:28 GMT

man page for errno says this.

[ENXIO] No such device or address. I/O on a special file refers
to a subdevice that does not exist, or is beyond the
limits of the device. It can also occur when, for
example, a tape drive is not on line or no disk pack is
loaded on a drive.

Can you post the snippet of the code?

-Umapathy

Re: device or address that does exit error with name pipe

Adam J Markiewicz — Wed, 04 Jun 2003 16:57:34 GMT

Hi

Would it be a hint for you?

man 2 open
[...]
If O_NDELAY is set:
A read-only open() returns without delay.
A write-only open() returns an error if no process currently has the file open for reading.
[...]

Good luck
Adam