1 .\" Copyright (c) 2008 David Xu <davidxu@freebsd.org>
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25 .\" $FreeBSD: src/lib/libc/gen/tcgetsid.3,v 1.1 2008/04/15 08:33:32 davidxu Exp $
32 .Nd get session ID associated with a controlling terminal
43 function returns the process group ID of the session leader for a
44 controlling terminal specified by
49 returns -1 and the global variable
51 is set to indicate the error, as follows:
56 argument is not a valid file descriptor.
58 The calling process does not have a controlling terminal or the
59 underlying terminal device represented by
61 is not the controlling terminal.