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Annotation of cci/usr/src/man/man2/getrusage.2, revision 1.1

1.1     ! root        1: .TH GETRUSAGE 2 "18 July 1983"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: getrusage \- get information about resource utilization
        !             5: .SH SYNOPSIS
        !             6: .nf
        !             7: .ft B
        !             8: #include <sys/time.h>
        !             9: #include <sys/resource.h>
        !            10: .PP
        !            11: .ft B
        !            12: .ta \w'#define 'u +\w'RUSAGE_CHILDREN  'u +\w'-1        'u
        !            13: #define        RUSAGE_SELF     0       /* calling process */
        !            14: #define        RUSAGE_CHILDREN -1      /* terminated child processes */
        !            15: .DT
        !            16: .PP
        !            17: .ft B
        !            18: getrusage(who, rusage)
        !            19: int who;
        !            20: struct rusage *rusage;
        !            21: .fi
        !            22: .SH DESCRIPTION
        !            23: .I Getrusage
        !            24: returns information describing the resources utilized by the current
        !            25: process, or all its terminated child processes.
        !            26: The
        !            27: .I who
        !            28: parameter is one of RUSAGE_SELF and RUSAGE_CHILDREN.
        !            29: If
        !            30: .I rusage
        !            31: is non-zero, the buffer it points to will be filled in with
        !            32: the following structure:
        !            33: .PP
        !            34: .nf
        !            35: .RS
        !            36: .ta \w'struct  'u +\w'struct  'u +3u*\w'struct  'u
        !            37: struct rusage {
        !            38:        struct timeval ru_utime;        /* user time used */
        !            39:        struct timeval ru_stime;        /* system time used */
        !            40:        int     ru_maxrss;
        !            41:        int     ru_ixrss;       /* integral shared memory size */
        !            42:        int     ru_idrss;       /* integral unshared data size */
        !            43:        int     ru_isrss;       /* integral unshared stack size */
        !            44:        int     ru_minflt;      /* page reclaims */
        !            45:        int     ru_majflt;      /* page faults */
        !            46:        int     ru_nswap;       /* swaps */
        !            47:        int     ru_inblock;     /* block input operations */
        !            48:        int     ru_oublock;     /* block output operations */
        !            49:        int     ru_msgsnd;      /* messages sent */
        !            50:        int     ru_msgrcv;      /* messages received */
        !            51:        int     ru_nsignals;    /* signals received */
        !            52:        int     ru_nvcsw;       /* voluntary context switches */
        !            53:        int     ru_nivcsw;      /* involuntary context switches */
        !            54: };
        !            55: .RE
        !            56: .DT
        !            57: .fi
        !            58: .PP
        !            59: The fields are interpreted as follows:
        !            60: .TP 15
        !            61: ru_utime
        !            62: the total amount of time spent executing in user mode.
        !            63: .TP 15
        !            64: ru_stime
        !            65: the total amount of time spent in the system executing on behalf
        !            66: of the process(es).
        !            67: .TP 15
        !            68: ru_maxrss
        !            69: the maximum resident set size utilized (in kilobytes).
        !            70: .TP 15
        !            71: ru_ixrss
        !            72: an \*(lqintegral\*(rq value indicating the amount of memory used
        !            73: which was also shared among other processes.  This value is expressed
        !            74: in units of kilobytes * seconds-of-execution and is calculated by
        !            75: summing the number of shared memory pages in use each time the internal
        !            76: system clock ticks and then averaging over 1 second intervals.
        !            77: .TP 15
        !            78: ru_idrss
        !            79: an integral value of the amount of unshared memory residing in the
        !            80: data segment of a process (expressed in units of
        !            81: kilobytes * seconds-of-execution).
        !            82: .TP 15
        !            83: ru_isrss
        !            84: an integral value of the amount of unshared memory residing in the
        !            85: stack segment of a process (expressed in units of
        !            86: kilobytes * seconds-of-execution).
        !            87: .TP 15
        !            88: ru_minflt
        !            89: the number of page faults serviced without any i/o activity; here
        !            90: i/o activity is avoided by \*(lqreclaiming\*(rq a page frame from
        !            91: the list of pages awaiting reallocation.
        !            92: .TP 15
        !            93: ru_majflt
        !            94: the number of page faults serviced which required i/o activity.
        !            95: .TP 15
        !            96: ru_nswap
        !            97: the number of times a process was \*(lqswapped\*(rq out of main
        !            98: memory.
        !            99: .TP 15
        !           100: ru_inblock
        !           101: the number of times the file system had to perform input.
        !           102: .TP 15
        !           103: ru_outblock
        !           104: the number of times the file system had to perform output.
        !           105: .TP 15
        !           106: ru_msgsnd
        !           107: the number of ipc messages sent.
        !           108: .TP 15
        !           109: ru_msgrcv
        !           110: the number of ipc messages received.
        !           111: .TP 15
        !           112: ru_nsignals
        !           113: the number of signals delivered.
        !           114: .TP 15
        !           115: ru_nvcsw
        !           116: the number of times a context switch resulted due to a process
        !           117: voluntarily giving up the processor before its time slice was
        !           118: completed (usually to await availability of a resource).
        !           119: .TP 15
        !           120: ru_nivcsw
        !           121: the number of times a context switch resulted due to a higher
        !           122: priority process becoming runnable or because the current process
        !           123: exceeded its time slice.
        !           124: .SH NOTES
        !           125: The numbers 
        !           126: .I ru_inblock
        !           127: and 
        !           128: .I ru_outblock
        !           129: account only for real
        !           130: i/o; data supplied by the cacheing mechanism is charged only
        !           131: to the first process to read or write the data.
        !           132: .SH SEE ALSO
        !           133: gettimeofday(2), wait(2)
        !           134: .SH BUGS
        !           135: There is no way to obtain information about a child process
        !           136: which has not yet terminated.

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