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Annotation of 43BSDTahoe/man/man3/vlimit.3, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)vlimit.3c   6.2 (Berkeley) 5/12/86
        !             6: .\"
        !             7: .TH VLIMIT 3C "May 12, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: vlimit \- control maximum system resource consumption
        !            11: .SH SYNOPSIS
        !            12: .B "#include <sys/vlimit.h>"
        !            13: .PP
        !            14: .B vlimit(resource, value)
        !            15: .SH DESCRIPTION
        !            16: .ft B
        !            17: This facility is superseded by getrlimit(2).
        !            18: .ft R
        !            19: .PP
        !            20: Limits the consumption by the current process and each process
        !            21: it creates to not individually exceed 
        !            22: .I value
        !            23: on the specified
        !            24: .I resource.
        !            25: If
        !            26: .I value
        !            27: is specified as \-1, then the current limit is returned and the
        !            28: limit is unchanged.
        !            29: The resources which are currently controllable are:
        !            30: .TP 15
        !            31: LIM_NORAISE
        !            32: A pseudo-limit; if set non-zero then the limits may not be raised.
        !            33: Only the super-user may remove the \fInoraise\fR restriction.
        !            34: .TP 15
        !            35: LIM_CPU
        !            36: the maximum
        !            37: number of cpu-seconds to be used by each process
        !            38: .TP 15
        !            39: LIM_FSIZE
        !            40: the largest single file which can be created
        !            41: .TP 15
        !            42: LIM_DATA
        !            43: the maximum growth of the data+stack region via
        !            44: .IR sbrk (2)
        !            45: beyond the end of the program text
        !            46: .TP 15
        !            47: LIM_STACK
        !            48: the maximum
        !            49: size of the automatically-extended stack region
        !            50: .TP 15
        !            51: LIM_CORE
        !            52: the size of the largest core dump that will be created.
        !            53: .TP 15
        !            54: LIM_MAXRSS
        !            55: a soft limit for the amount of physical memory (in bytes) to be given
        !            56: to the program.  If memory is tight, the system will prefer to take memory
        !            57: from processes which are exceeding their declared LIM_MAXRSS.
        !            58: .PP
        !            59: Because this information is stored in the per-process information
        !            60: this system call must be executed directly by the shell if it
        !            61: is to affect all future processes created by the shell;
        !            62: .I limit
        !            63: is thus a built-in command to
        !            64: .IR csh (1).
        !            65: .PP
        !            66: The system refuses to extend the data or stack space when the limits
        !            67: would be exceeded in the normal way; a
        !            68: .I break
        !            69: call fails if the data space limit is reached, or the process is
        !            70: killed when the stack limit is reached (since the stack cannot be
        !            71: extended, there is no way to send a signal!).
        !            72: .PP
        !            73: A file i/o operation which would create a file which is too large
        !            74: will cause a signal SIGXFSZ to be generated, this normally terminates
        !            75: the process, but may be caught.
        !            76: When the cpu time limit is exceeded, a signal SIGXCPU is sent to the
        !            77: offending process; to allow it time to process the signal it is
        !            78: given 5 seconds grace by raising the cpu time limit.
        !            79: .SH SEE ALSO
        !            80: csh(1)
        !            81: .SH BUGS
        !            82: LIM_NORAISE no longer exists.

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