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38 lines
659 B
38 lines
659 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: setpinebacklight [0-10]\n");
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}
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int main(int argc, char *argv[]) {
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char * command;
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int brightness;
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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 > 10) {
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usage();
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return 1;
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}
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command = malloc(100);
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sprintf(
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command,
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"sh -c 'echo %d > /sys/devices/platform/backlight/backlight/backlight/brightness'",
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brightness
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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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