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46 lines
833 B
46 lines
833 B
5 years ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void usage() {
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fprintf(stderr, "Usage: setpineled [red|green|blue] [0-255]\n");
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}
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int main(int argc, char *argv[]) {
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int brightness;
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char * color;
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char * command;
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if (argc < 2) {
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usage();
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return 1;
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}
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argc--;
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brightness = atoi(argv[argc--]);
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if (brightness < 0 || brightness > 255) {
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usage();
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return 1;
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}
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color = argv[argc--];
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if (strcmp(color, "red") && strcmp(color, "blue") && strcmp(color, "green")) {
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usage();
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return 1;
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}
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command = malloc(80);
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sprintf(
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command,
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"sh -c 'echo %d > /sys/devices/platform/leds/leds/pinephone:%s:user/brightness'",
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brightness,
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color
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);
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if (setuid(0)) {
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fprintf(stderr, "setuid(0) failed\n");
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} else {
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return system(command);
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}
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}
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