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Annotation of researchv10dc/man/manb/vlimit.2v, revision 1.1

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

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