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Unix Version 7 - man page for pkopen (v7 section 3)

PKOPEN(3)				       Library Functions Manual 				    PKOPEN(3)

NAME
pkopen, pkclose, pkread, pkwrite, pkfail - packet driver simulator
SYNOPSIS
char *pkopen(fd) pkclose(ptr) char *ptr; pkread(ptr, buffer, count) char *ptr, *buffer; pkwrite(ptr, buffer, count) char *ptr, *buffer; pkfail()
DESCRIPTION
These routines are a user-level implementation of the full-duplex end-to-end communication protocol described in pk(4). If fd is a file descriptor open for reading and writing, pkopen carries out the initial synchro- nization and returns an identifying pointer. The pointer is used as the first parameter to pkread, pkwrite, and pkclose. Pkread, pkwrite and pkclose behave analogously to read, write and close(2). However, a write of zero bytes is meaningful and will produce a corresponding read of zero bytes.
SEE ALSO
pk(4), pkon(2)
DIAGNOSTICS
Pkfail is called upon persistent breakdown of communication. Pkfail must be supplied by the user. Pkopen returns a null (0) pointer if packet protocol can not be established. Pkread returns -1 on end of file, 0 in correspondence with a 0-length write.
BUGS
This simulation of pk(4) leaves something to be desired in needing special read and write routines, and in not being inheritable across calls of exec(2). Its prime use is on systems that lack pk. These functions use alarm(2); simultaneous use of alarm for other puposes may cause trouble. deprecated PKOPEN(3)


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