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Readme.md

Proc

Expose system state via the /proc file system.

Known limitations

This was written for us to use at Voxer on Joyent. It has not been tested outside of SmartOS and I have no expectations that this should run on anything but some flavor of Solaris.

usage

Expose /proc/self/usage

Usage usage (Oh, so meta.)

var proc = require('proc');

proc.usage(function (err, usage_obj) {
    console.dir(usage_obj);
});

Underlying data structure

/*
 * Resource usage.
 */
typedef struct prusage {
    id_t        pr_lwpid;   /* lwp id.  0: process or defunct */
    int         pr_count;   /* number of contributing lwps */
    timestruc_t pr_tstamp;  /* current time stamp */
    timestruc_t pr_create;  /* process/lwp creation time stamp */
    timestruc_t pr_term;    /* process/lwp termination time stamp */
    timestruc_t pr_rtime;   /* total lwp real (elapsed) time */
    timestruc_t pr_utime;   /* user level cpu time */
    timestruc_t pr_stime;   /* system call cpu time */
    timestruc_t pr_ttime;   /* other system trap cpu time */
    timestruc_t pr_tftime;  /* text page fault sleep time */
    timestruc_t pr_dftime;  /* data page fault sleep time */
    timestruc_t pr_kftime;  /* kernel page fault sleep time */
    timestruc_t pr_ltime;   /* user lock wait sleep time */
    timestruc_t pr_slptime; /* all other sleep time */
    timestruc_t pr_wtime;   /* wait-cpu (latency) time */
    timestruc_t pr_stoptime;    /* stopped time */
    timestruc_t filltime[6];    /* filler for future expansion */
    ulong_t     pr_minf;    /* minor page faults */
    ulong_t     pr_majf;    /* major page faults */
    ulong_t     pr_nswap;   /* swaps */
    ulong_t     pr_inblk;   /* input blocks */
    ulong_t     pr_oublk;   /* output blocks */
    ulong_t     pr_msnd;    /* messages sent */
    ulong_t     pr_mrcv;    /* messages received */
    ulong_t     pr_sigs;    /* signals received */
    ulong_t     pr_vctx;    /* voluntary context switches */
    ulong_t     pr_ictx;    /* involuntary context switches */
    ulong_t     pr_sysc;    /* system calls */
    ulong_t     pr_ioch;    /* chars read and written */
    ulong_t     filler[10]; /* filler for future expansion */
} prusage_t;

License

(The MIT License)

Copyright (c) 2012 Daniel D. Shaw dshaw@dshaw.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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