From 8b18e8e33cbefc19f7f011a7ac83820621395b2f Mon Sep 17 00:00:00 2001 From: Peter Bui Date: Sat, 26 Feb 2011 17:45:12 -0500 Subject: Add print_cpu_usage --- src/print_cpu_usage.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 src/print_cpu_usage.c (limited to 'src') diff --git a/src/print_cpu_usage.c b/src/print_cpu_usage.c new file mode 100644 index 0000000..d80693d --- /dev/null +++ b/src/print_cpu_usage.c @@ -0,0 +1,50 @@ +// vim:sw=8:sts=8:ts=8:expandtab +#include +#include +#include +#include + +#include "i3status.h" + +static int prev_total = 0; +static int prev_idle = 0; + +/* + * Reads the CPU utilization from /proc/stat and returns the usage as a + * percentage. + * + */ +void print_cpu_usage(const char *format) { + const char *walk; + char buf[1024]; + int curr_user, curr_nice, curr_system, curr_idle, curr_total; + int diff_idle, diff_total, diff_usage; + +#if defined(LINUX) + static char statpath[512]; + strcpy(statpath, "/proc/stat"); + if (!slurp(statpath, buf, sizeof(buf))) + die("could not read %s\n", statpath); + + if (sscanf(buf, "cpu %d %d %d %d", &curr_user, &curr_nice, &curr_system, &curr_idle) != 4) + die("could not read cpu utilization\n"); + + curr_total = curr_user + curr_nice + curr_system + curr_idle; + diff_idle = curr_idle - prev_idle; + diff_total = curr_total - prev_total; + diff_usage = (1000 * (diff_total - diff_idle)/diff_total + 5)/10; + prev_total = curr_total; + prev_idle = curr_idle; +#endif + for (walk = format; *walk != '\0'; walk++) { + if (*walk != '%') { + putchar(*walk); + continue; + } + + if (strncmp(walk+1, "usage", strlen("usage")) == 0) { + printf("%02d%%", diff_usage); + walk += strlen("usage"); + } + } +} -- cgit v1.2.3