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	dwmclock-netstat.c (3760B)
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	1 #include <X11/Xlib.h>
	2 #include <X11/Xatom.h>
	3 #include <time.h>
	4 #include <locale.h>
	5 #include <unistd.h>
	6 #include <stdio.h>
	7 #include <sys/types.h>
	8 #include <sys/stat.h>
	9 #include <fcntl.h>
	10 #include <string.h>
	11 #include <stdint.h>
	12 #include <inttypes.h>
	13 #include <math.h>
	14
	15 #define IFNAMSIZ 16
	16
	17
	18 static const char* determine_def_if(void) {
	19 FILE *f;
	20 const char* ret = 0;
	21 static char buf[IFNAMSIZ];
	22 char filebuf[256];
	23 f = fopen("/proc/net/route", "r");
	24 if (f) {
	25 while (fgets(filebuf, sizeof filebuf, f)) {
	26 char *tab = strchr(filebuf, '\t');
	27 if (tab && !strncmp(tab + 1, "00000000", 8)) {
	28 memcpy(buf, filebuf, tab - filebuf);
	29 buf[tab - filebuf] = 0;
	30 ret = buf;
	31 break;
	32 }
	33 }
	34 fclose(f);
	35 }
	36 return ret;
	37 }
	38
	39 static uint64_t readfile(const char* filename) {
	40 FILE* f;
	41 uint64_t ret = 0, tmp;
	42 f = fopen(filename, "r");
	43 if (f) {
	44 if (fscanf(f, "%"SCNu64, &tmp) == 1)
	45 ret = tmp;
	46 fclose(f);
	47 }
	48 return ret;
	49 }
	50
	51 static uint64_t get_rx_bytes(const char* interface)
	52 {
	53 char fnbuf[sizeof "/sys/class/net//statistics/rx_bytes" + IFNAMSIZ];
	54 strcpy(fnbuf, "/sys/class/net/");
	55 strcat(fnbuf, interface);
	56 strcat(fnbuf, "/statistics/rx_bytes");
	57 return readfile(fnbuf);
	58 }
	59
	60 static uint64_t get_tx_bytes(const char* interface)
	61 {
	62 char fnbuf[sizeof "/sys/class/net//statistics/rx_bytes" + IFNAMSIZ];
	63 strcpy(fnbuf, "/sys/class/net/");
	64 strcat(fnbuf, interface);
	65 strcat(fnbuf, "/statistics/tx_bytes");
	66 return readfile(fnbuf);
	67 }
	68
	69 static int get_suff(uint64_t x)
	70 {
	71 int r = -1 + !x;
	72 while (x) {
	73 r++;
	74 x >>= 10;
	75 }
	76 return r;
	77 }
	78
	79 int main(void) {
	80 Display *dpy;
	81 Window root;
	82 int loadfd;
	83
	84 setlocale(LC_ALL, "");
	85 dpy = XOpenDisplay(0);
	86 if (dpy) {
	87 struct timespec tm, s;
	88 ssize_t rv;
	89 char oldif[IFNAMSIZ] = {0};
	90 uint64_t rxb, txb;
	91 static const char suffixes[] = " KMGT"; // let's stay real here
	92 root = XDefaultRootWindow(dpy);
	93 clock_gettime(CLOCK_REALTIME, &tm);
	94 s.tv_sec = 0;
	95 s.tv_nsec = 1000000000 - tm.tv_nsec;
	96 do rv = nanosleep(&s, &s);
	97 while (rv == -1 && s.tv_nsec);
	98 for (;;) {
	99 char buf[100]; // estimate
	100 const char *thisif = determine_def_if();
	101 uint64_t currxb, curtxb;
	102 int idx;
	103 int i;
	104 if (thisif)
	105 {
	106 if (strcmp(thisif, oldif))
	107 {
	108 strcpy(oldif, thisif);
	109 rxb = txb = 0;
	110 }
	111 i = 0;
	112 buf[i++] = oldif[0];
	113 buf[i++] = ' ';
	114 buf[i++] = 'v';
	115 currxb = get_rx_bytes(oldif);
	116 curtxb = get_tx_bytes(oldif);
	117 idx = get_suff(currxb - rxb);
	118 i += snprintf(buf + i, sizeof buf - i, "%.1f%c", (double…
	119 rxb = currxb;
	120 buf[i++] = ' ';
	121 buf[i++] = '^';
	122 idx = get_suff(curtxb - txb);
	123 i += snprintf(buf + i, sizeof buf - i, "%.1f%c", (double…
	124 txb = curtxb;
	125 }
	126 else
	127 buf[i++] = 'n';
	128 buf[i++] = ' ';
	129 buf[i++] = '\|';
	130 buf[i++] = ' ';
	131 time_t t;
	132 size_t l;
	133 t = time(0);
	134 l = strftime(buf + i, sizeof buf - i, "%c", localtime(&t));
	135 XStoreName(dpy, root, buf);
	136 XSync(dpy, False);
	137 sleep(1);
	138 }
	139 }
	140 }