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28 .\" @(#)tcgetpgrp.3 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/gen/tcgetpgrp.3,v 1.6.2.2 2001/12/14 18:33:51 ru Exp $
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37 .Nd get foreground process group ID
44 .Fn tcgetpgrp "int fd"
48 function returns the value of the process group ID of the foreground
49 process group associated with the terminal device.
50 If there is no foreground process group,
52 returns an invalid process ID.
56 returns -1 and the global variable
58 is set to indicate the error, as follows:
63 argument is not a valid file descriptor.
65 The calling process does not have a controlling terminal or the
66 underlying terminal device represented by
68 is not the controlling terminal.
77 function is expected to be compliant with the