1/*  Part of SWISH
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        jan@swi-prolog.org
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2015-2024, VU University Amsterdam
    7			      SWI-Prolog Solutions b.v.
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
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   15       notice, this list of conditions and the following disclaimer.
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   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
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   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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   34*/
   35
   36:- module(procps,
   37	  [ procps_stat/1,		% -Stat
   38	    procps_stat/2,		% +Pid, -Stat
   39	    procps_thread_stat/2,	% ?Thread, -Stat
   40	    procps_status/1,		% -Status
   41	    procps_status/2		% +Pid, -Status
   42	  ]).   43:- if(exists_source(library(unix))).   44:- use_module(library(unix)).   45:- endif.   46:- use_module(library(lists)).

   51		 /*******************************
   52		 *	  /proc/[pid]/stat	*
   53		 *******************************/

 procps_stat(-Stat:dict) is det

 procps_stat(+PID, -Stat:dict) is det

 procps_thread_stat(+Thread, -Stat:dict) is det

Get data from the stat file of the current process, the process identified by PID or the Prolog thread identified by Thread. In all cases, this returns a dict tagged stat with the field values as defined by man 5 proc.

Errors

- existence_error(source_sink, _) if the system does not provide the /proc filesystem.

   67procps_stat(Stat) :-
   68	stat_file_dict('/proc/self/stat', Stat).
   69procps_stat(Pid, Stat) :-
   70	atomic_list_concat(['/proc/', Pid, '/stat'], StatFile),
   71	stat_file_dict(StatFile, Stat).
   72
   73procps_thread_stat(Thread, Stat) :-
   74	thread_property(Thread, system_thread_id(TID)),
   75	atomic_list_concat(['/proc/self/task/', TID, '/stat'], StatFile),
   76	stat_file_dict(StatFile, Stat).
   77
   78stat_file_dict(StatFile, Stat) :-
   79	setup_call_cleanup(
   80	    open(StatFile, read, In),
   81	    read_string(In, _, String),
   82	    close(In)),
   83	split_string(String, " ", " \n", Parts),
   84	parts_pairs(Parts, 1, Pairs),
   85	dict_pairs(Stat, stat, Pairs).
   86
   87parts_pairs([], _, []).
   88parts_pairs([H0|T0], I0, [H|T]) :-
   89	part_pair(H0, I0, H),
   90	I is I0+1,
   91	parts_pairs(T0, I, T).
   92
   93part_pair(String, I, Key-Value) :-
   94	stat_field(Key, I), !,
   95	stat_field_value(Key, String, Value).
   96part_pair(String, I, I-String).
   97
   98stat_field_value(comm, String, Command) :- !,
   99	sub_string(String, 1, _, 1, Command).
  100stat_field_value(state, String, Atom) :- !,
  101	atom_string(Atom, String).
  102stat_field_value(Field, String, Seconds) :-
  103	time_field(Field), !,
  104	number_string(ClockTicks, String),
  105	clockticks(TicksPerSec),
  106	Seconds is ClockTicks/TicksPerSec.
  107stat_field_value(Field, String, Bytes) :-
  108	page_field(Field), !,
  109	number_string(Pages, String),
  110	pagesize(BytesPerPage),
  111	Bytes is Pages*BytesPerPage.
  112stat_field_value(_, String, Number) :-
  113	number_string(Number, String).
  114
  115:- if(current_predicate(sysconf/1)).  116% the weird way to call sysconf confuses ClioPatria's cpack code
  117% analysis enough to accept this ...
  118term_expansion(clockticks(sysconf), Expansion) :-
  119	(   member(Sysconf, [sysconf(clk_tck(TicksPerSec))]),
  120	    call(Sysconf)
  121	->  Expansion = clockticks(TicksPerSec)
  122	;   Expansion = clockticks(100)
  123	).
  124term_expansion(pagesize(sysconf), Expansion) :-
  125	(   member(Sysconf, [sysconf(pagesize(Bytes))]),
  126	    call(Sysconf)
  127	->  Expansion = pagesize(Bytes)
  128	;   Expansion = pagesize(4096)
  129	).
  130clockticks(sysconf).
  131pagesize(sysconf).
  132:- else.  133clockticks(100).
  134pagesize(4096).
  135:- endif.  136
  137time_field(utime).
  138time_field(stime).
  139time_field(cutime).
  140time_field(cstime).
  141time_field(starttime).
  142
  143page_field(rss).
  144
  145stat_field(pid,			  1).
  146stat_field(comm,		  2).
  147stat_field(state,		  3).
  148stat_field(ppid,		  4).
  149stat_field(pgrp,		  5).
  150stat_field(session,		  6).
  151stat_field(tty_nr,		  7).
  152stat_field(tpgid,		  8).
  153stat_field(flags,		  9).
  154stat_field(minflt,		  10).
  155stat_field(cminflt,		  11).
  156stat_field(majflt,		  12).
  157stat_field(cmajflt,		  13).
  158stat_field(utime,		  14).
  159stat_field(stime,		  15).
  160stat_field(cutime,		  16).
  161stat_field(cstime,		  17).
  162stat_field(priority,		  18).
  163stat_field(nice,		  19).
  164stat_field(num_threads,		  20).
  165stat_field(itrealvalue,		  21).
  166stat_field(starttime,		  22).
  167stat_field(vsize,		  23).
  168stat_field(rss,			  24).
  169stat_field(rsslim,		  25).
  170stat_field(startcode,		  26).
  171stat_field(endcode,		  27).
  172stat_field(startstack,		  28).
  173stat_field(kstkesp,		  29).
  174stat_field(kstkeip,		  30).
  175stat_field(signal,		  31).
  176stat_field(blocked,		  32).
  177stat_field(sigignore,		  33).
  178stat_field(sigcatch,		  34).
  179stat_field(wchan,		  35).
  180stat_field(nswap,		  36).
  181stat_field(cnswap,		  37).
  182stat_field(exit_signal,		  38).
  183stat_field(processor,		  39).
  184stat_field(rt_priority,		  40).
  185stat_field(policy,		  41).
  186stat_field(delayacct_blkio_ticks, 42).
  187stat_field(guest_time,		  43).
  188stat_field(cguest_time,		  44).
  189stat_field(start_data,		  45).
  190stat_field(end_data,		  46).
  191stat_field(start_brk,		  47).
  192stat_field(arg_start,		  48).
  193stat_field(arg_end,		  49).
  194stat_field(env_start,		  50).
  195stat_field(env_end,		  51).
  196stat_field(exit_code,		  52).
  197
  198
  199		 /*******************************
  200		 *	/proc/[pid]/status	*
  201		 *******************************/

 procps_status(-Status:dict) is det

 procps_status(+PID, -Status:dict) is det

Get the data from /proc/self/status as a Prolog dict.

To be done

- Not all fields are currently translated.

  210procps_status(Stat) :-
  211	status_file_dict('/proc/self/status', Stat).
  212procps_status(Pid, Stat) :-
  213	atomic_list_concat(['/proc/', Pid, '/status'], StatFile),
  214	status_file_dict(StatFile, Stat).
  215
  216status_file_dict(StatFile, Status) :-
  217	setup_call_cleanup(
  218	    open(StatFile, read, In),
  219	    read_string(In, _, String),
  220	    close(In)),
  221	split_string(String, "\n", " \n", Lines),
  222	status_line_pairs(Lines, Pairs),
  223	dict_pairs(Status, status, Pairs).
  224
  225status_line_pairs([], []).
  226status_line_pairs([H0|T0], [Name-Value|T]) :-
  227	split_string(H0, ":", " \t", [NameS, ValueS]),
  228	string_lower(NameS, NameLS),
  229	atom_string(Name, NameLS),
  230	status_value(Name, ValueS, Value), !,
  231	status_line_pairs(T0, T).
  232status_line_pairs([_|T0], T) :-
  233	status_line_pairs(T0, T).
  234
  235status_value(state, ValueS, State) :- !,
  236	split_string(ValueS, " ", " ", [Vs|_]),
  237	atom_string(State, Vs).
  238status_value(Name, ValueS, Bytes) :-
  239	sub_atom(Name, 0, _, _, vm), !,
  240	split_string(ValueS, " ", " ", [Vs,"kB"]),
  241	number_string(Kb, Vs),
  242	Bytes is Kb*1024.
  243status_value(Name, ValueS, Value) :-
  244	status_field(Name, list(Type)),
  245	!,
  246	split_string(ValueS, " \t", " \t", Values),
  247	maplist(to_type(Type), Values, Value).
  248status_value(Name, ValueS, Value) :-
  249	status_field(Name, Type),
  250	to_type(Type, ValueS, Value).
  251
  252to_type(integer, String, Int) :-
  253	number_string(Int, String).
  254to_type(hex, String, Int) :-
  255	string_concat('0x', String, Hex),
  256	number_string(Int, Hex).
  257
  258status_field(uid, list(integer)).
  259status_field(gid, list(integer)).
  260status_field(groups, list(integer)).
  261status_field(cpus_allowed, hex).
  262status_field(fdsize, integer).
  263status_field(threads, integer)