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getrlimitusage.2: add the man page

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Reviewed by:	olce
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D46823
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Konstantin Belousov 2024-09-27 22:12:21 +03:00
parent cdd9629921
commit 3670421e21
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1
lib/libsys/Makefile.sys
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@ -218,6 +218,7 @@ MAN+= abort2.2 \
getpriority.2 \
getrandom.2 \
getrlimit.2 \
getrlimitusage.2 \
getrusage.2 \
getsid.2 \
getsockname.2 \

100
lib/libsys/getrlimitusage.2 Normal file
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@ -0,0 +1,100 @@
.\" Copyright (c) 2024 The FreeBSD Foundation, Inc.
.\"
.\" This documentation was written by
.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
.\" from the FreeBSD Foundation.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd September 27, 2024
.Dt GETRLIMITUSAGE 2
.Os
.Sh NAME
.Nm getrlimitusage
.Nd Query usage of the current process' limited resources
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/resource.h
.Ft int
.Fn getrlimitusage "unsigned which" "int flags" "rlim_t *res"
.Sh DESCRIPTION
The
.Nm
system call allows the process to query current consumption of the resources
limited by the
.Xr setrlimit 2
call.
.Pp
The
.Fa which
argument specifies the resource, same as for
.Xr getrlimit 2
and
.Xr setrlimit 2
calls, see their man page for the list of enforced resource types.
.Pp
The
.Fa flags
argument modifies the behavior of the call in the following ways:
.Bl -tag -width GETRLIMITUSAGE_XXXXXX
.It Va GETRLIMITUSAGE_EUID
Query the resource usage for user identified by effective UID of the process,
instead of the real UID (which is default for accounting).
.El
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
The
.Fn getrlimitusage
system call will fail if:
.Bl -tag -width Er
.It Bq Er EFAULT
The address specified for
.Fa res
is invalid.
.It Bq Er EINVAL
The resource specified to
.Fn getrlimitusage
in the
.Fa which
argument is unknown.
.It Bq Er ENXIO
The resource specified to
.Fn getrlimitusage
in the
.Fa which
argument is not accounted, but only enforced in specific situations.
Examples of such resources are
.Va RLIMIT_FSIZE
and
.Va RLIMIT_CORE .
.El
.Sh SEE ALSO
.Xr procstat 1 ,
.Xr getrlimit 2 ,
.Xr setrlimit 2 .
.Sh HISTORY
The
.Fn getrlimitusage
system call appeared in
.Bx 15.0 .