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30 .\" @(#)tcgetpgrp.3 8.1 (Berkeley) 6/4/93
37 .Nd get session ID associated with a controlling terminal
48 function returns the value of the session ID associated with the specified
49 controlling terminal device.
50 The session ID is defined as the process group ID of the session leader.
54 returns -1 and the global variable
56 is set to indicate the error, as follows:
61 argument is not a valid file descriptor.
63 The calling process does not have a controlling terminal or the
64 underlying terminal device represented by
66 is not the controlling terminal.