An example of creeping featurism

Doug Gwyn <gwyn> gwyn at brl-tgr.ARPA
Sun Nov 18 12:56:23 AEST 1984

> ... a friend of mine needed a program to wait
> for a specified process, berkeley kernels let you do this
> by using kill, just kill a process with sig 0, it returns the
> error status without actually doing anything.  ...

All UNIXes I have ever used (from 6th Ed. on) support this.
It is even documented in the manual these days.

More information about the Comp.lang.c mailing list