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	tbrightness.c - spoon - [fork] customized build of spoon, the dwm status utility
	git clone git://src.adamsgaard.dk/spoon
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	---
	tbrightness.c (1111B)
	---
	1 #include <err.h>
	2 #include <stdio.h>
	3
	4 #ifdef __OpenBSD__
	5 #include <sys/ioctl.h>
	6 #include <fcntl.h>
	7 #include <time.h>
	8 #include <unistd.h>
	9 #include <dev/wscons/wsconsio.h>
	10
	11 int
	12 brightnessread(void arg, char buf, size_t len)
	13 {
	14 struct wsdisplay_param dpyp;
	15 int fd;
	16
	17 if ((fd = open("/dev/ttyC0", O_RDONLY)) == -1) {
	18 warn("couldn't open /dev/ttyC0");
	19 return -1;
	20 }
	21 dpyp.param = WSDISPLAYIO_PARAM_BRIGHTNESS;
	22 if (ioctl(fd, WSDISPLAYIO_GETPARAM, &dpyp) == -1) {
	23 warn("WSDISPLAYIO_PARAM_BRIGHTNESS ioctl");
	24 return -1;
	25 }
	26 close(fd);
	27 snprintf(buf, len, "%3d%%",
	28 100 * (dpyp.curval - dpyp.min) / (dpyp.max - dpyp.min));
	29
	30 return 0;
	31 }
	32 #elif __linux__
	33 #include <sys/wait.h>
	34 int
	35 brightnessread(void arg, char buf, size_t len)
	36 {
	37 FILE *fp;
	38 int brightness;
	39
	40 fp = popen("xbacklight", "r");
	41 if (fp == NULL)
	42 return -1;
	43 if (fscanf(fp, "%d", &brightness) == EOF) {
	44 if (ferror(fp)) {
	45 pclose(fp);
	46 return -1;
	47 }
	48 }
	49 /* This system does not have a backlight so report it as 100% */
	50 if (WEXITSTATUS(pclose(fp)) == 1)
	51 brightness = 100;
	52 snprintf(buf, len, "%3d%%", brightness);
	53 return 0;
	54 }
	55 #endif