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Revision 1.9, Fri Apr 30 05:09:23 2010 UTC (6 years, 8 months ago) by jruoho
Deprecated in POSIX (rev. 2008).
.\" $NetBSD: ulimit.3,v 1.9 2010/04/30 05:09:23 jruoho Exp $ .\" .\" Copyright (c) 1999 The NetBSD Foundation, Inc. .\" All rights reserved. .\" .\" This code is derived from software contributed to The NetBSD Foundation .\" by Klaus Klein. .\" .\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 April 30, 2010 .Dt ULIMIT 3 .Os .Sh NAME .Nm ulimit .Nd get and set process limits .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In ulimit.h .Ft long int .Fn ulimit "int cmd" ... .Sh DESCRIPTION The .Fn ulimit function provides a method to query or alter resource limits of the calling process. The method to be performed is specified by the .Fa cmd argument; possible values are: .Bl -tag -width UL_GETFSIZEXX .It Li UL_GETFSIZE Return the soft file size limit of the process. The value returned is in units of 512-byte blocks. If the result cannot be represented in an object of type .Fa long int , the result is unspecified. .It Li UL_SETFSIZE Set the hard and soft file size limits of the process to the value of the second argument passed, which is in units of 512-byte blocks, and which is expected to be of type .Fa long int . The new file size limit of the process is returned. Any process may decrease the limit, but raising it is only permitted if the caller is the super-user. .El .Pp If successful, the .Fn ulimit function will not change the setting of .Va errno . .Sh RETURN VALUES If successful, the .Fn ulimit function returns the value of the requested limit. Otherwise, it returns \-1, sets .Va errno to indicate an error, and the limit is not changed. Therefore, to detect an error condition applications should set .Va errno to 0, call .Fn ulimit , and check if \-1 is returned and .Va errno is non-zero. .Sh ERRORS The .Fn ulimit function will fail if: .Bl -tag -width Er .It Bq Er EINVAL The .Fa cmd argument is not valid. .It Bq Er EPERM It was attempted to increase a limit, and the caller is not the super-user. .El .Sh SEE ALSO .Xr getrlimit 2 , .Xr setrlimit 2 .Sh STANDARDS The .Fn ulimit function conforms to .St -xsh5 and .St -p1003.1-2001 . It was marked as obsolete in the .St -p1003.1-2008 revision, which recommended the use of .Xr getrlimit 2 and .Xr setrlimit 2 instead, noting that because .Fn ulimit uses the type .Vt long rather than .Vt rlim_t , it may not be sufficient for file sizes on many current systems.