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-> (SCO Unix) Why do I get can't open /dev/tty errors?


Unix, Xenix and ODT General FAQ



This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open Desktop or Openserver.

This is an old article about SCO Unix and is only left here for historical purposes.

There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

Why do I get "can't open /dev/tty" errors (Old Sco Unix)?

If you are getting this from some program you are running in background or from cron, it's because it can't write to your terminal- either because it doesn't have a tty to write to (cron) or because it's detached or otherwise blocked.

(/dev/tty is a special file that always is the controlling terminal- even when standard input and standard output have been redirected).

A common program that writes to /dev/tty is cpio: if it needs another volume (tape or floppy is full), it writes to /dev/tty asking you to give it the name of another device it can write on. Therefore, cpio scripts put into background can generate this kind of message.

If you are getting this at the command line, the permissions on /dev or /dev/tty itself may be wrong.

Stuart J. Browne noted:

If you want to see the actual message (and you are using OSR5+) try adding the "-P0,1" flag to CPIO, ie:

    find . -print | tee /etc/backup.list | cpio -oBc -P0,1 $TAPEDEV
 



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Since I manage dozens of SCO OpenServer boxes I thought this would be great - I have a mix of 5.0.5 and 5.0.6 boxes.

Unfortunately in the circumstance where you are using 5.0.5 (including fully patched boxes) and the tape cannot fit the full archive, it will begin redirecting all of the rest of the backup from the point it fails into the last file it read before it filled up. So use some caution.



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