120 lines
3.5 KiB
Groff
120 lines
3.5 KiB
Groff
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.\" $NetBSD: ulimit.3,v 1.9 2010/04/30 05:09:23 jruoho Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Klaus Klein.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd April 30, 2010
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.Dt ULIMIT 3
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.Os
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.Sh NAME
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.Nm ulimit
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.Nd get and set process limits
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In ulimit.h
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.Ft long int
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.Fn ulimit "int cmd" ...
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.Sh DESCRIPTION
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The
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.Fn ulimit
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function provides a method to query or alter resource limits of the calling
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process.
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The method to be performed is specified by the
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.Fa cmd
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argument; possible values are:
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.Bl -tag -width UL_GETFSIZEXX
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.It Li UL_GETFSIZE
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Return the soft file size limit of the process.
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The value returned is in units of 512-byte blocks.
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If the result cannot be represented in an object of type
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.Fa long int ,
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the result is unspecified.
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.It Li UL_SETFSIZE
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Set the hard and soft file size limits of the process to the value of the
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second argument passed, which is in units of 512-byte blocks, and which is
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expected to be of type
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.Fa long int .
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The new file size limit of the process is returned.
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Any process may decrease the limit, but raising it is only permitted if
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the caller is the super-user.
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.El
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.Pp
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If successful, the
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.Fn ulimit
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function will not change the setting of
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.Va errno .
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.Sh RETURN VALUES
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If successful, the
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.Fn ulimit
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function returns the value of the requested limit.
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Otherwise, it returns \-1, sets
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.Va errno
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to indicate an error, and the limit is not changed.
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Therefore, to detect an error condition applications should set
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.Va errno
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to 0, call
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.Fn ulimit ,
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and check if \-1 is returned and
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.Va errno
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is non-zero.
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.Sh ERRORS
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The
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.Fn ulimit
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa cmd
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argument is not valid.
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.It Bq Er EPERM
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It was attempted to increase a limit, and the caller is not the super-user.
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.El
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.Sh SEE ALSO
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.Xr getrlimit 2 ,
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.Xr setrlimit 2
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.Sh STANDARDS
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The
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.Fn ulimit
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function conforms to
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.St -xsh5
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and
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.St -p1003.1-2001 .
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It was marked as obsolete in the
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.St -p1003.1-2008
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revision, which recommended the use of
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.Xr getrlimit 2
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and
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.Xr setrlimit 2
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instead, noting that because
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.Fn ulimit
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uses the type
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.Vt long
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rather than
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.Vt rlim_t ,
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it may not be sufficient for file sizes on many current systems.
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