gen/tcgetpgrp.3

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  32 .\"     @(#)tcgetpgrp.3 8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/lib/libc/gen/tcgetpgrp.3,v 1.8 2001/10/01 16:08:51 ru Exp $
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  35 .Dd June 4, 1993
  36 .Dt TCGETPGRP 3
  37 .Os
  38 .Sh NAME
  39 .Nm tcgetpgrp
  40 .Nd get foreground process group ID
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In sys/types.h
  45 .In unistd.h
  46 .Ft pid_t
  47 .Fn tcgetpgrp "int fd"
  48 .Sh DESCRIPTION
  49 The
  50 .Fn tcgetpgrp
  51 function returns the value of the process group ID of the foreground
  52 process group associated with the terminal device.
  53 If there is no foreground process group,
  54 .Fn tcgetpgrp
  55 returns an invalid process ID.
  56 .Sh ERRORS
  57 If an error occurs,
  58 .Fn tcgetpgrp
  59 returns -1 and the global variable
  60 .Va errno
  61 is set to indicate the error, as follows:
  62 .Bl -tag -width Er
  63 .It Bq Er EBADF
  64 The
  65 .Fa fd
  66 argument is not a valid file descriptor.
  67 .It Bq Er ENOTTY
  68 The calling process does not have a controlling terminal or the
  69 underlying terminal device represented by
  70 .Fa fd
  71 is not the controlling terminal.
  72 .El
  73 .Sh SEE ALSO
  74 .Xr setpgid 2 ,
  75 .Xr setsid 2 ,
  76 .Xr tcsetpgrp 3
  77 .Sh STANDARDS
  78 The
  79 .Fn tcgetpgrp
  80 function is expected to be compliant with the
  81 .St -p1003.1-88
  82 specification.