1 /*
2 Copyright 2021 Northern.tech AS
3
4 This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; version 3.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
18
19 To the extent this program is licensed as part of the Enterprise
20 versions of CFEngine, the applicable Commercial Open Source License
21 (COSL) may apply to this file if you as a licensee so wish it. See
22 included file COSL.txt.
23 */
24
25 #include <cf3.defs.h>
26
27 #include <file_lib.h>
28 #include <mon.h>
29
30 #if !defined(__MINGW32__)
31
32 /* Constants */
33
34 # define MON_CPU_MAX 4
35
36 /* Globals */
37
38 static double LAST_CPU_Q[MON_CPU_MAX + 1] = { 0.0 };
39 static long LAST_CPU_T[MON_CPU_MAX + 1] = { 0 };
40
41 /* Implementation */
42
MonCPUGatherData(double * cf_this)43 void MonCPUGatherData(double *cf_this)
44 {
45 double q, dq;
46 char cpuname[CF_MAXVARSIZE], buf[CF_BUFSIZE];
47 long cpuidx, userticks = 0, niceticks = 0, systemticks = 0, idle = 0, iowait = 0, irq = 0, softirq = 0;
48 long total_time = 1;
49 enum observables slot = ob_spare;
50
51 FILE *fp = safe_fopen("/proc/stat", "r");
52 if (fp == NULL)
53 {
54 Log(LOG_LEVEL_VERBOSE, "Could not open /proc/stat while gathering CPU data (fopen: %s)", GetErrorStr());
55 return;
56 }
57
58 Log(LOG_LEVEL_VERBOSE, "Reading /proc/stat utilization data -------");
59
60 while (!feof(fp))
61 {
62 if (fgets(buf, sizeof(buf), fp) == NULL)
63 {
64 break;
65 }
66 nt_static_assert(CF_MAXVARSIZE == 1024);
67 if (sscanf(buf, "%1023s%ld%ld%ld%ld%ld%ld%ld", cpuname, &userticks, &niceticks, &systemticks, &idle, &iowait, &irq,
68 &softirq) != 8)
69 {
70 Log(LOG_LEVEL_VERBOSE, "Could not scan /proc/stat line: %60s", buf);
71 continue;
72 }
73
74 total_time = (userticks + niceticks + systemticks + idle);
75
76 q = 100.0 * (double) (total_time - idle);
77
78 if (strcmp(cpuname, "cpu") == 0)
79 {
80 Log(LOG_LEVEL_VERBOSE, "Found aggregate CPU");
81 slot = ob_cpuall;
82 cpuidx = MON_CPU_MAX;
83 }
84 else if (strncmp(cpuname, "cpu", 3) == 0)
85 {
86 if (sscanf(cpuname, "cpu%ld", &cpuidx) == 1)
87 {
88 if ((cpuidx < 0) || (cpuidx >= MON_CPU_MAX))
89 {
90 continue;
91 }
92 }
93 else
94 {
95 continue;
96 }
97 slot = ob_cpu0 + cpuidx;
98 }
99 else
100 {
101 Log(LOG_LEVEL_VERBOSE, "Found nothing (%s)", cpuname);
102 slot = ob_spare;
103 fclose(fp);
104 return;
105 }
106
107 dq = (q - LAST_CPU_Q[cpuidx]) / (double) (total_time - LAST_CPU_T[cpuidx]); /* % Utilization */
108
109 if ((dq > 100) || (dq < 0)) // Counter wrap around
110 {
111 dq = 50;
112 }
113
114 cf_this[slot] = dq;
115 LAST_CPU_Q[cpuidx] = q;
116 LAST_CPU_T[cpuidx] = total_time;
117
118 Log(LOG_LEVEL_VERBOSE, "Set %s=%d to %.1lf after %ld 100ths of a second ",
119 OBSERVABLES[slot][1], slot, cf_this[slot], total_time);
120 }
121
122 fclose(fp);
123 }
124
125 #endif /* !__MINGW32__ */
126