diff options
Diffstat (limited to 'brightnessctl.c')
| -rw-r--r-- | brightnessctl.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/brightnessctl.c b/brightnessctl.c index 1d43a2a..49834f7 100644 --- a/brightnessctl.c +++ b/brightnessctl.c @@ -93,7 +93,7 @@ int main(int argc, char **argv) { struct device *devs[255]; struct device *dev; struct utsname name; - char *dev_name; + char *dev_name, *file_path; int n, c, phelp = 0; if (uname(&name)) fail("Unable to determine current OS. Exiting!\n"); @@ -173,8 +173,16 @@ int main(int argc, char **argv) { fail("Invalid value given"); if (!(dev = find_device(devs, dev_name))) fail("Device '%s' not found.\n", dev_name); - if ((p.operation == SET || p.restore) && !p.pretend && geteuid()) - fail("You need to run this program as root to be able to modify values!\n"); + if ((p.operation == SET || p.restore) && !p.pretend && geteuid()) { + errno = 0; + file_path = cat_with('/', path, dev->class, dev->id, "brightness"); + if (access(file_path, W_OK)) { + perror("Can't modify brightness"); + fail("\nYou should run this program with root privileges.\n" + "Alternatively, get write permissions for device files.\n"); + } + free(file_path); + } if (p.save) if (save_device_data(dev)) fprintf(stderr, "Could not save data for device '%s'.\n", dev_name); |