Archiving statusbar C sources

examples/statusbar items - C sources/README.md

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+These small C programs were supposed to make statusbar in i3wm keep system load down to even 0.00 on my very old machine, where even calling a "cat" or "grep" repeatedly every few seconds caused measurable system load.

examples/statusbar items - C sources/cpu.c

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+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+    long double a[4], b[4], loadavg;
+    FILE *fp;
+    fp = fopen("/proc/stat","r");
+    fscanf(fp,"%*s %Lf %Lf %Lf %Lf",&a[0],&a[1],&a[2],&a[3]);
+    fclose(fp);
+    sleep(1);
+    fp = fopen("/proc/stat","r");
+    fscanf(fp,"%*s %Lf %Lf %Lf %Lf",&b[0],&b[1],&b[2],&b[3]);
+    fclose(fp);
+    loadavg = ((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]));
+    printf("%*d\n",3,(int)(loadavg*100));
+    return(0);
+}

examples/statusbar items - C sources/hoststat.c

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+#include <stdio.h>
+#include <string.h>
+
+void func1()
+{
+    FILE *fp;
+    char string[255];
+    fp = fopen("/media/usb/lbu.last","r");
+    if(fp == NULL){
+        printf("lbu down");
+    }
+    char string2[255];
+    fscanf(fp,"%*s %*s %*s %s %*s %*s %s", string, string2);
+    fclose(fp);
+    printf(" LBU commit %s %-10s \n",string,string2);
+}
+
+void func2()
+{
+    char string[3][5];
+    FILE *fp;
+    fp = fopen("/proc/loadavg","r");
+    fscanf(fp,"%s %s %s", string[1],string[2],string[3]);
+    fclose(fp);
+    printf(" Load averages %s %s %s   \n",string[1],string[2],string[3]);
+}
+
+void func3()
+{
+    char string[3][5];
+    FILE *fp;
+    fp = fopen("/proc/loadavg","r");
+    fscanf(fp,"%s %s %s", string[1],string[2],string[3]);
+    fclose(fp);
+    printf(" Load averages %s %s %s   \n",string[1],string[2],string[3]);
+}
+
+// main is a control loop
+int main(void)
+{
+    FILE *fp = fopen("/tmp/hoststat.sock","r+");
+    if(fp == NULL){
+        printf("socket lost");
+        fp = fopen("/tmp/hoststat.sock","w+");
+        fclose(fp);
+        return 1;
+    }
+    char tmpsock[50];
+    fgets(tmpsock,50,fp);
+    fclose(fp);
+    fp = fopen("/tmp/hoststat.sock","w");
+    if (strcmp(tmpsock,"step0\n")==0) 
+    {
+        func1();
+        fprintf(fp,"step1\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step1\n")==0){
+        func1();
+        fprintf(fp,"step2\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step2\n")==0){
+        func2();
+        fprintf(fp,"step3\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step3\n")==0){
+        func2();
+        fprintf(fp,"step4\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step4\n")==0){
+        func2();
+        fprintf(fp,"step5\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step5\n")==0){
+        func3();
+        fprintf(fp,"step6\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step6\n")==0){
+        func3();
+        fprintf(fp,"step7\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step7\n")==0){
+        func3();
+        fprintf(fp,"step8\n");
+        return 0;
+    }
+    if (strcmp(tmpsock,"step8\n")==0){
+        func1();
+        fprintf(fp,"step0\n");
+        return 0;
+    }
+    else 
+    {
+        printf("Starting up");
+        fprintf(fp,"step0\n");
+        return 0;
+    }    
+}

examples/statusbar items - C sources/loadavg.c

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+#include <stdio.h>
+
+int main (void)
+{
+    float loadavg;
+    FILE *fp;
+    fp = fopen("/proc/loadavg","r");
+    fscanf(fp,"%f",&loadavg);
+    fclose(fp);
+    printf("%.2f",loadavg);
+    if ( loadavg > 2.0 ) 
+    {
+        printf("\a");
+    }
+    return(0);
+}

examples/statusbar items - C sources/mem.c

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+#include <stdio.h>
+
+int main(void)
+{
+    unsigned long long availmem;
+    FILE *fp;
+    fp = fopen("/proc/meminfo","r");
+    fscanf(fp,"%*s %*s %*s %*s %*s %*s %*s %llu", &availmem);
+    fclose(fp);
+    printf("%llu MB free\n",availmem/1024);
+    return(0);
+}