2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
129 lines
3.6 KiB
Groff
129 lines
3.6 KiB
Groff
.\" $NetBSD: getpgrp.2,v 1.23 2009/03/23 14:11:27 joerg Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. 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. 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 8.1 (Berkeley) 6/4/93
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.\"
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.Dd August 11, 2002
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.Dt GETPGRP 2
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.Os
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.Sh NAME
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.Nm getpgrp ,
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.Nm getpgid
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.Nd get process group
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft pid_t
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.Fn getpgrp "void"
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.Ft pid_t
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.Fn getpgid "pid_t pid"
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.Sh DESCRIPTION
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The process group of the current process is returned by
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.Fn getpgrp .
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The process group of the
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.Fa pid
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process is returned by
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.Fn getpgid .
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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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.Fn tcgetpgrp
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and
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.Fn tcsetpgrp
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calls
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are used to get/set the process group of the control terminal.
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.Sh ERRORS
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.Fn getpgrp
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always succeeds, however
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.Fn getpgid
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will succeed unless:
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.Bl -tag -width Er
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.It Bq Er ESRCH
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if there is no process with a process ID equal to
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.Fa pid .
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.El
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.Sh SEE ALSO
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.Xr setpgid 2 ,
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.Xr termios 4
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.Sh STANDARDS
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The
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.Fn getpgrp
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function conforms to
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.St -p1003.1-88 .
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.Sh HISTORY
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The
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.Fn getpgrp
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function call appeared in
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.Bx 4.0 .
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The
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.Fn getpgid
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function call is derived from its usage in
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.At V.4 ,
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and first appeared in
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.Nx 1.3 .
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.Sh COMPATIBILITY
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This version of
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.Fn getpgrp
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differs from past Berkeley versions by not taking a
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.Fa "pid_t pid"
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argument.
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This incompatibility is required by
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.St -p1003.1-90 .
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.Pp
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From the
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.St -p1003.1-90
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Rationale:
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.Lp
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.Bx 4.3
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provides a
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.Fn getpgrp
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function that returns the process group ID for a specified process.
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Although this function is used to support job control, all known
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job-control shells always specify the calling process with this
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function.
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Thus, the simpler System V
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.Fn getpgrp
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suffices, and the added complexity of the
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.Bx 4.3
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.Fn getpgrp
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has been omitted from POSIX.1.
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The old functionality is available from the
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.Fn getpgid
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function.
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