|File: [cvs.NetBSD.org] / src / lib / libc / gen / ulimit.3 (download)
Revision 1.9, Fri Apr 30 05:09:23 2010 UTC (3 years ago) by jruoho
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Changes since 1.8: +18 -11
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.
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.\" by Klaus Klein.
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.Dd April 30, 2010
.Dt ULIMIT 3
.Nd get and set process limits
.Ft long int
.Fn ulimit "int cmd" ...
function provides a method to query or alter resource limits of the calling
The method to be performed is specified by the
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.
If successful, the
function will not change the setting of
.Va errno .
.Sh RETURN VALUES
If successful, the
function returns the value of the requested limit.
Otherwise, it returns \-1, sets
to indicate an error, and the limit is not changed.
Therefore, to detect an error condition applications should set
to 0, call
.Fn ulimit ,
and check if \-1 is returned and
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
argument is not valid.
.It Bq Er EPERM
It was attempted to increase a limit, and the caller is not the super-user.
.Sh SEE ALSO
.Xr getrlimit 2 ,
.Xr setrlimit 2
function conforms to
.St -p1003.1-2001 .
It was marked as obsolete in the
revision, which recommended the use of
.Xr getrlimit 2
.Xr setrlimit 2
instead, noting that because
uses the type
.Vt rlim_t ,
it may not be sufficient for file sizes on many current systems.