update C snipplets

code/C/System/disk_usage.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <sys/statvfs.h>
+
+#define PATH "/media/user/Samsung USB"
+
+int main(int argc, const char *argv[]) {
+  const unsigned int GB = (1024 * 1024) * 1024;
+  struct statvfs buffer;
+  int ret = statvfs(PATH, &buffer);
+
+  if (!ret) {
+    const double total = (double)(buffer.f_blocks * buffer.f_frsize) / GB;
+    const double available = (double)(buffer.f_bfree * buffer.f_frsize) / GB;
+    const double used = total - available;
+    const double usedPercentage = (double)(used / total) * (double)100;
+    printf("Total: %f --> %.0f\n", total, total);
+    printf("Available: %f --> %.0f\n", available, available);
+    printf("Used: %f --> %.1f\n", used, used);
+    printf("Used Percentage: %f --> %.0f\n", usedPercentage, usedPercentage);
+  }
+
+  return ret;
+}

code/C/System/get-pid-by-process-name.c

@@ -0,0 +1,12 @@
+pid_t getPIDbyName(char *ps_name) {
+  FILE *fp;
+  char *cmd = (char *)calloc(1, 200);
+
+  sprintf(cmd, "pidof %s", ps_name);
+
+  fp = popen(cmd, "r");
+  fread(cmd, 1, 200, fp);
+  fclose(fp);
+
+  return atoi(cmd);
+}

code/C/System/get_ram_usage.c

@@ -0,0 +1,11 @@
+#include <sys/resource.h>
+#include <stdio.h>
+
+int main() {
+  struct rusage r_usage;
+  getrusage(RUSAGE_SELF, &r_usage);
+
+  printf("Memory usage: %ld kilobytes\n", r_usage.ru_maxrss);
+
+  return 0;
+}