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108 lines
3.2 KiB
Groff
108 lines
3.2 KiB
Groff
.\" Copyright (c) 2011 Sergey Kandaurov
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd May 3, 2014
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.Dt PGET 9
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.Os
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.Sh NAME
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.Nm pget
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.Nd locate a process by number
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/proc.h
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.Ft int
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.Fn pget "pid_t pid" "int flags" "struct proc **pp"
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.Sh DESCRIPTION
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This function
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takes a
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.Fa pid
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as its argument,
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which can be either a process or thread id,
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and fills a pointer to the
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.Vt proc
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structure in
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.Fa *pp .
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In the latter case, a process owning the specified thread is looked for.
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The operation is performed by invoking the
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.Xr pfind 9
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function.
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The found process is returned locked.
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For the
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.Dv PGET_HOLD
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case, it is returned unlocked (but held).
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The
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.Fn pget
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function can
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perform additional manipulations, depending on a
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.Fa flags
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argument.
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.Pp
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The
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.Fa flags
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argument is the logical OR of some subset of:
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.Bl -tag -width ".Dv PGET_NOTINEXEC"
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.It Dv PGET_HOLD
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If set, the found process will be held and unlocked.
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.It Dv PGET_CANSEE
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If set, the found process will be checked for its visibility.
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See
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.Xr p_cansee 9 .
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.It Dv PGET_CANDEBUG
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If set, the found process will be checked for its debuggability.
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See
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.Xr p_candebug 9 .
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.It Dv PGET_ISCURRENT
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If set, the found process will be checked that it matches the current
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process context.
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.It Dv PGET_NOTWEXIT
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If set, the found process will be checked that it does not have the process
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flag
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.Dv P_WEXIT
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set.
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.It Dv PGET_NOTINEXEC
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If set, the found process will be checked that it does not have the process
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flag
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.Dv P_INEXEC
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set.
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.It Dv PGET_NOTID
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If set,
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.Fa pid
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is not assumed as a thread id for values larger than
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.Dv PID_MAX .
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.It Dv PGET_WANTREAD
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If set, the found process will be checked that the caller may get
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a read access to its structure.
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A shorthand for
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.Pq Dv PGET_HOLD | PGET_CANDEBUG | PGET_NOTWEXIT .
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.El
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.Sh RETURN VALUES
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If the process is found in the specified way, then zero is returned,
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otherwise an appropriate error code is returned.
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.Sh SEE ALSO
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.Xr p_candebug 9 ,
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.Xr p_cansee 9 ,
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.Xr pfind 9
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