usr/src/share/doc/ps1/06.sysman/2.5.t

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.\"     @(#)2.5.t       6.2 (Berkeley) 5/12/86
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.sh "Process and kernel descriptors
.PP
The status of the facilities in this section is still under discussion.
The \fIptrace\fP facility of earlier UNIX systems
remains in 4.3BSD.
Planned enhancements would allow a descriptor-based process control facility.