Created
May 1, 2020 23:37
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| //This file is licensed under the BSD 3-clause license and based on i3/i3status. | |
| #include <sys/sysinfo.h> | |
| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| static int prev_idle = 0, prev_total = 0; | |
| int print_cpu_usage() { | |
| int curr_idle = 0, curr_total = 0; | |
| FILE *f = fopen("/proc/stat", "r"); | |
| if (!f) goto error; | |
| char line[4096]; | |
| fgets(line, sizeof(line), f); | |
| for(int i = 0; i < get_nprocs(); i++) { | |
| fgets(line, sizeof(line), f); | |
| int id, user, nice, system, idle; | |
| sscanf(line, "cpu%d %d %d %d %d", &id, &user, &nice, &system, &idle); | |
| curr_idle += idle; | |
| curr_total += user + nice + system + idle; | |
| } | |
| fclose(f); | |
| int diff_idle = curr_idle - prev_idle; | |
| int diff_total = curr_total - prev_total; | |
| double diff_usage = (diff_total ? (1000 * ((double)diff_total - (double)diff_idle) / (double)diff_total + 5) / 10 : 0); | |
| prev_idle = curr_idle; | |
| prev_total = curr_total; | |
| char buf[16]; | |
| int len = sprintf(buf, "%f\n", diff_usage); | |
| f = fopen("/tmp/cpu.txt", "w"); | |
| if(!f) goto error; | |
| fwrite(buf, 1, len, f); | |
| fclose(f); | |
| return 0; | |
| error: | |
| puts("Encountered an error:"); | |
| perror(NULL); | |
| return 1; | |
| } | |
| int main() { | |
| while(!print_cpu_usage()) sleep(1); | |
| } |
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