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cpu_perc: Check for division by zero

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Ingo Feinerer 2019-02-14 19:25:51 +01:00 committed by Aaron Marcher
parent d518472e62
commit 10bdf01b71
1 changed files with 27 additions and 18 deletions
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45
components/cpu.c
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@ -24,7 +24,7 @@
cpu_perc(void) cpu_perc(void)
{ {
static long double a[7]; static long double a[7];
long double b[7]; long double b[7], sum;
memcpy(b, a, sizeof(b)); memcpy(b, a, sizeof(b));
/* cpu user nice system idle iowait irq softirq */ /* cpu user nice system idle iowait irq softirq */
@ -37,13 +37,16 @@
return NULL; return NULL;
} }
sum = (b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
(a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]);
if (sum == 0) {
return NULL;
}
return bprintf("%d", (int)(100 * return bprintf("%d", (int)(100 *
((b[0] + b[1] + b[2] + b[5] + b[6]) - ((b[0] + b[1] + b[2] + b[5] + b[6]) -
(a[0] + a[1] + a[2] + a[5] + a[6])) / (a[0] + a[1] + a[2] + a[5] + a[6])) / sum));
((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] +
b[6]) -
(a[0] + a[1] + a[2] + a[3] + a[4] + a[5] +
a[6]))));
} }
#elif defined(__OpenBSD__) #elif defined(__OpenBSD__)
#include <sys/param.h> #include <sys/param.h>
@ -75,7 +78,7 @@
{ {
int mib[2]; int mib[2];
static uintmax_t a[CPUSTATES]; static uintmax_t a[CPUSTATES];
uintmax_t b[CPUSTATES]; uintmax_t b[CPUSTATES], sum;
size_t size; size_t size;
mib[0] = CTL_KERN; mib[0] = CTL_KERN;
@ -92,15 +95,18 @@
return NULL; return NULL;
} }
sum = (a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] + a[CP_IDLE]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]);
if (sum == 0) {
return NULL;
}
return bprintf("%d", 100 * return bprintf("%d", 100 *
((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
a[CP_INTR]) - a[CP_INTR]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] + (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
b[CP_INTR])) / b[CP_INTR])) / sum);
((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
a[CP_INTR] + a[CP_IDLE]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
b[CP_INTR] + b[CP_IDLE])));
} }
#elif defined(__FreeBSD__) #elif defined(__FreeBSD__)
#include <sys/param.h> #include <sys/param.h>
@ -129,7 +135,7 @@
{ {
size_t size; size_t size;
static long a[CPUSTATES]; static long a[CPUSTATES];
long b[CPUSTATES]; long b[CPUSTATES], sum;
size = sizeof(a); size = sizeof(a);
memcpy(b, a, sizeof(b)); memcpy(b, a, sizeof(b));
@ -142,14 +148,17 @@
return NULL; return NULL;
} }
sum = (a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] + a[CP_IDLE]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]);
if (sum == 0) {
return NULL;
}
return bprintf("%d", 100 * return bprintf("%d", 100 *
((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
a[CP_INTR]) - a[CP_INTR]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] + (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
b[CP_INTR])) / b[CP_INTR])) / sum);
((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
a[CP_INTR] + a[CP_IDLE]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
b[CP_INTR] + b[CP_IDLE])));
} }
#endif #endif