78 lines
2.7 KiB
Groff
78 lines
2.7 KiB
Groff
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.\" Copyright (c) 1983, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getpgrp.2 6.4 (Berkeley) 3/10/91
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.\"
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.Dd March 10, 1991
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.Dt GETPGRP 2
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.Os BSD 4.2
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.Sh NAME
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.Nm getpgrp
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.Nd get process group
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.Sh SYNOPSIS
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.Ft pid_t
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.Fn getpgrp "int pid"
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.Sh DESCRIPTION
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The process group of the specified process is returned by
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.Fn getpgrp .
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If
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.Fa pid
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is zero, the call applies to the current process.
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.Pp
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Process groups are used for distribution of signals, and
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by terminals to arbitrate requests for their input: processes
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that have the same process group as the terminal are foreground
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and may read, while others will block with a signal if they attempt
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to read.
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.Pp
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This call is thus used by programs such as
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.Xr csh 1
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to create
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process groups
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in implementing job control.
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The
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.Dv TIOCGPGRP
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and
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.Dv TIOCSPGRP
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calls
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described in
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.Xr termios 4
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are used to get/set the process group of the control terminal.
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.Sh SEE ALSO
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.Xr setpgrp 2 ,
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.Xr getuid 2 ,
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.Xr termios 4
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.Sh HISTORY
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The
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.Nm
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function call appeared in
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.Bx 4.0 .
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