1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
// vim:ts=4:sw=4:expandtab
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>
#include "i3status.h"
#define BINARY_BASE UINT64_C(1024)
#define MAX_EXPONENT 4
static const char *const iec_symbols[MAX_EXPONENT + 1] = {"", "Ki", "Mi", "Gi", "Ti"};
static const char filename[] = "/proc/meminfo";
/*
* Prints the given amount of bytes in a human readable manner.
*
*/
static int print_bytes_human(char *outwalk, uint64_t bytes) {
double size = bytes;
int exponent = 0;
int bin_base = BINARY_BASE;
while (size >= bin_base && exponent < MAX_EXPONENT) {
size /= bin_base;
exponent += 1;
}
return sprintf(outwalk, "%.1f %sB", size, iec_symbols[exponent]);
}
/*
* Determines whether remaining bytes are below given threshold.
*
*/
static bool below_threshold(const long totalRam, const long usedRam, const char *threshold_type, const long low_threshold) {
// empty is available or free, based on "use_available_memory"
long empty = totalRam - usedRam;
if (BEGINS_WITH(threshold_type, "percentage_")) {
return 100.0 * empty / totalRam < low_threshold;
} else if (strcasecmp(threshold_type, "bytes_free") == 0) {
return empty < low_threshold;
} else if (threshold_type[0] != '\0' && strncasecmp(threshold_type + 1, "bytes_", strlen("bytes_")) == 0) {
uint64_t base = BINARY_BASE;
long factor = 1;
switch (threshold_type[0]) {
case 'T':
case 't':
factor *= base;
case 'G':
case 'g':
factor *= base;
case 'M':
case 'm':
factor *= base;
case 'K':
case 'k':
factor *= base;
break;
default:
return false;
}
return empty < low_threshold * factor;
}
return false;
}
void print_memory(yajl_gen json_gen, char *buffer, const char *format, const char *degraded_format_below_threshold, const char *degraded_threshold_type, const float degraded_low_threshold, const char *critical_format_below_threshold, const char *critical_threshold_type, const float critical_low_threshold, const bool use_available_memory) {
char *outwalk = buffer;
#if defined(linux)
const char *selected_format = format;
const char *walk;
bool colorful_output = false;
long totalRam = -1;
long freeRam = -1;
long availableRam = -1;
long usedRam = -1;
long sharedRam = -1;
long cached = -1;
long buffers = -1;
FILE *file = fopen(filename, "r");
if (!file) {
goto error;
}
char line[128];
while (fgets(line, sizeof line, file)) {
if (BEGINS_WITH(line, "MemTotal:")) {
totalRam = strtol(line + strlen("MemTotal:"), NULL, 10);
}
if (BEGINS_WITH(line, "MemFree:")) {
freeRam = strtol(line + strlen("MemFree:"), NULL, 10);
}
if (BEGINS_WITH(line, "MemAvailable:")) {
availableRam = strtol(line + strlen("MemAvailable:"), NULL, 10);
}
if (BEGINS_WITH(line, "Buffers:")) {
buffers = strtol(line + strlen("Buffers:"), NULL, 10);
}
if (BEGINS_WITH(line, "Cached:")) {
cached = strtol(line + strlen("Cached:"), NULL, 10);
}
if (BEGINS_WITH(line, "Shmem:")) {
sharedRam = strtol(line + strlen("Shmem:"), NULL, 10);
}
if (totalRam != -1 && freeRam != -1 && availableRam != -1 && buffers != -1 && cached != -1 && sharedRam != -1) {
break;
}
}
fclose(file);
if (totalRam == -1 || freeRam == -1 || availableRam == -1 || buffers == -1 || cached == -1 || sharedRam == -1) {
goto error;
}
totalRam = totalRam * BINARY_BASE;
freeRam = freeRam * BINARY_BASE;
availableRam = availableRam * BINARY_BASE;
buffers = buffers * BINARY_BASE;
cached = cached * BINARY_BASE;
sharedRam = sharedRam * BINARY_BASE;
if (use_available_memory) {
usedRam = totalRam - availableRam;
} else {
usedRam = totalRam - freeRam - buffers - cached;
}
if (degraded_low_threshold > 0 && below_threshold(totalRam, usedRam, degraded_threshold_type, degraded_low_threshold)) {
if (critical_low_threshold > 0 && below_threshold(totalRam, usedRam, critical_threshold_type, critical_low_threshold)) {
START_COLOR("color_bad");
colorful_output = true;
if (critical_format_below_threshold != NULL)
selected_format = critical_format_below_threshold;
} else {
START_COLOR("color_degraded");
colorful_output = true;
if (degraded_format_below_threshold != NULL)
selected_format = degraded_format_below_threshold;
}
}
for (walk = selected_format; *walk != '\0'; walk++) {
if (*walk != '%') {
*(outwalk++) = *walk;
continue;
}
if (BEGINS_WITH(walk + 1, "total")) {
outwalk += print_bytes_human(outwalk, totalRam);
walk += strlen("total");
}
if (BEGINS_WITH(walk + 1, "used")) {
outwalk += print_bytes_human(outwalk, usedRam);
walk += strlen("used");
}
if (BEGINS_WITH(walk + 1, "free")) {
outwalk += print_bytes_human(outwalk, freeRam);
walk += strlen("free");
}
if (BEGINS_WITH(walk + 1, "available")) {
outwalk += print_bytes_human(outwalk, availableRam);
walk += strlen("available");
}
if (BEGINS_WITH(walk + 1, "shared")) {
outwalk += print_bytes_human(outwalk, sharedRam);
walk += strlen("shared");
}
if (BEGINS_WITH(walk + 1, "percentage_free")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * freeRam / totalRam, pct_mark);
walk += strlen("percentage_free");
}
if (BEGINS_WITH(walk + 1, "percentage_available")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * availableRam / totalRam, pct_mark);
walk += strlen("percentage_available");
}
if (BEGINS_WITH(walk + 1, "percentage_used")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * usedRam / totalRam, pct_mark);
walk += strlen("percentage_used");
}
if (BEGINS_WITH(walk + 1, "percentage_shared")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * sharedRam / totalRam, pct_mark);
walk += strlen("percentage_shared");
}
}
if (colorful_output)
END_COLOR;
*outwalk = '\0';
OUTPUT_FULL_TEXT(buffer);
return;
error:
OUTPUT_FULL_TEXT("can't read memory");
fputs("i3status: Cannot read system memory using /proc/meminfo\n", stderr);
#else
fputs("i3status: Memory status information is not supported on this system\n", stderr);
#endif
}
|
