diff options
| author | David Schlachter <fbsd-bugzilla@schlachter.ca> | 2021-03-03 07:57:35 +0000 |
|---|---|---|
| committer | Emmanuel Vadot <manu@FreeBSD.org> | 2021-03-03 07:57:35 +0000 |
| commit | 3b005d51bd0fe4d8d19fb2df4d470b6e8baebf16 (patch) | |
| tree | d52a85bb1bb01383a62f6c37fe291383be0559dd /usr.bin/backlight | |
| parent | 5842073a9b7471831e0da48d29dd984d575f4e9e (diff) | |
| download | src-3b005d51bd0fe4d8d19fb2df4d470b6e8baebf16.tar.gz src-3b005d51bd0fe4d8d19fb2df4d470b6e8baebf16.zip | |
Diffstat (limited to 'usr.bin/backlight')
| -rw-r--r-- | usr.bin/backlight/backlight.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/usr.bin/backlight/backlight.c b/usr.bin/backlight/backlight.c index 1dae0cfe5c62..9cf7a0912e95 100644 --- a/usr.bin/backlight/backlight.c +++ b/usr.bin/backlight/backlight.c @@ -98,7 +98,7 @@ main(int argc, char *argv[]) BACKLIGHTGETSTATUS, BACKLIGHTUPDATESTATUS, BACKLIGHTGETINFO}; - long percent = 0; + long percent = -1; const char *percent_error; uint32_t i; bool setname; @@ -188,15 +188,20 @@ main(int argc, char *argv[]) } break; case BACKLIGHT_SET_BRIGHTNESS: + if (percent == -1) + usage(); props.brightness = percent; if (ioctl(fd, BACKLIGHTUPDATESTATUS, &props) == -1) errx(1, "Cannot update the backlight device"); break; case BACKLIGHT_INCR: case BACKLIGHT_DECR: + if (percent == 0) + /* Avoid any ioctl if we don't have anything to do */ + break; if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1) errx(1, "Cannot query the backlight device"); - percent = percent == 0 ? 10 : percent; + percent = percent == -1 ? 10 : percent; percent = action == BACKLIGHT_INCR ? percent : -percent; props.brightness += percent; if ((int)props.brightness < 0) |