[hackers] [slstatus] slstatus: add cpu_iowait || Kurt Van Dijck

[git]

commit 72a5e52a35d0a133cafa1a7b5b86f4549589965d
Author:     Kurt Van Dijck <dev.k...@vandijck-laurijssen.be>
AuthorDate: Thu Sep 14 23:58:38 2017 +0200
Commit:     Aaron Marcher <m...@drkhsh.at>
CommitDate: Sat Sep 16 13:46:40 2017 +0200

    slstatus: add cpu_iowait
    
    This commit introduces the cpu_iowait item, this is the percentage
    of cpu time spent waiting on disks. High numbers typically indicate
    that your system is not responsive due to disk IO.
    This commit also avoid sleeping inside the cpu_perc and cpu_iowait
    functions: waiting in either one implies lost info for the other.
    
    Signed-off-by: Kurt Van Dijck <dev.k...@vandijck-laurijssen.be>

diff --git a/config.def.h b/config.def.h
index 0e28d1e..6370008 100644
--- a/config.def.h
+++ b/config.def.h
@@ -16,6 +16,7 @@ static const char unknown_str[] = "n/a";
  * battery_power        battery power usage             battery name
  * battery_state        battery charging state          battery name
  * cpu_perc             cpu usage in percent            NULL
+ * cpu_iowait           cpu iowait in percent           NULL
  * cpu_freq             cpu frequency in MHz            NULL
  * datetime             date and time                   format string
  * disk_free            free disk space in GB           mountpoint path
diff --git a/slstatus.c b/slstatus.c
index e69423b..cbc35a4 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -40,6 +40,7 @@ static const char *battery_power(const char *bat);
 static const char *battery_state(const char *bat);
 static const char *cpu_freq(void);
 static const char *cpu_perc(void);
+static const char *cpu_iowait(void);
 static const char *datetime(const char *fmt);
 static const char *disk_free(const char *mnt);
 static const char *disk_perc(const char *mnt);
@@ -177,26 +178,47 @@ cpu_freq(void)
 static const char *
 cpu_perc(void)
 {
-       struct timespec delay;
        int perc;
-       long double a[4], b[4];
+       static long double a[7];
+       static int valid;
+       long double b[7];
 
-       if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
-                  &a[3]) != 4) {
+       memcpy(b, a, sizeof(b));
+       if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], 
&a[1], &a[2],
+                  &a[3], &a[4], &a[5], &a[6]) != 7) {
                return unknown_str;
        }
+       if (!valid) {
+               valid = 1;
+               return unknown_str;
+       }
+
+       perc = 100 * ((b[0]+b[1]+b[2]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[5]+a[6])) /
+              ((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]));
 
-       delay.tv_sec = (interval / 2) / 1000;
-       delay.tv_nsec = ((interval / 2) % 1000) * 1000000;
-       nanosleep(&delay, NULL);
+       return bprintf("%d", perc);
+}
 
-       if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2],
-                  &b[3]) != 4) {
+static const char *
+cpu_iowait(void)
+{
+       int perc;
+       static int valid;
+       static long double a[7];
+       long double b[7];
+
+       memcpy(b, a, sizeof(b));
+       if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], 
&a[1], &a[2],
+                  &a[3], &a[4], &a[5], &a[6]) != 7) {
+               return unknown_str;
+       }
+       if (!valid) {
+               valid = 1;
                return unknown_str;
        }
 
-       perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) /
-              ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
+       perc = 100 * ((b[4]) - (a[4])) /
+              ((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]));
 
        return bprintf("%d", perc);
 }