1994-05-27 05:00:24 +00:00
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" @(#)vlimit.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt VLIMIT 3
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.Os BSD 4
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.Sh NAME
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.Nm vlimit
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.Nd control maximum system resource consumption
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.Sh SYNOPSIS
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.Fd #include <sys/vlimit.h>
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.Fn vlimit resource value
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is obsoleted by getrlimit(2).
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It is available from the compatibility library, libcompat.
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.Ef
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.Pp
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Limits the consumption by the current process and each process
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it creates to not individually exceed
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.Fa value
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on the specified
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.Fa resource .
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If
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.Fa value
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is specified as \-1, then the current limit is returned and the
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limit is unchanged.
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The resources which are currently controllable are:
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.Bl -tag -width LIM_NORAISE
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.It Dv LIM_NORAISE
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A pseudo-limit; if set non-zero then the limits may not be raised.
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Only the super-user may remove the
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.Em noraise
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restriction.
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.It Dv LIM_CPU
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the maximum
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number of cpu-seconds to be used by each process
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.It Dv LIM_FSIZE
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the largest single file which can be created
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.It Dv LIM_DATA
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the maximum growth of the data+stack region via
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.Xr sbrk 2
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beyond the end of the program text
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.It Dv LIM_STACK
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the maximum
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size of the automatically-extended stack region
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.It Dv LIM_CORE
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the size of the largest core dump that will be created.
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.It Dv LIM_MAXRSS
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a soft limit for the amount of physical memory (in bytes) to be given
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to the program. If memory is tight, the system will prefer to take memory
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from processes which are exceeding their declared
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.Dv LIM_MAXRSS.
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.El
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.Pp
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Because this information is stored in the per-process information
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this system call must be executed directly by the shell if it
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is to affect all future processes created by the shell;
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.Xr limit
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is thus a built-in command to
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.Xr csh 1 .
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.Pp
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The system refuses to extend the data or stack space when the limits
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would be exceeded in the normal way; a
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1996-04-07 00:06:21 +00:00
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.Xr brk 2
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1994-05-27 05:00:24 +00:00
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call fails if the data space limit is reached, or the process is
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killed when the stack limit is reached (since the stack cannot be
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extended, there is no way to send a signal!).
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.Pp
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A file
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.Tn I/O
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operation which would create a file which is too large
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will cause a signal
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.Dv SIGXFSZ
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to be generated, this normally terminates
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the process, but may be caught.
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When the cpu time limit is exceeded, a signal
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.Dv SIGXCPU
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is sent to the
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offending process; to allow it time to process the signal it is
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given 5 seconds grace by raising the
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.Tn CPU
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time limit.
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.Sh SEE ALSO
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.Xr csh 1
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.Sh HISTORY
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The
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.Fn vlimit
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function appeared in
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.Bx 4.2 .
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.Sh BUGS
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.Dv LIM_NORAISE
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no longer exists.
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1995-04-10 18:48:06 +00:00
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This function has not yet been reimplemented.
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