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terminal-util: add some explanatory comments

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This commit is contained in:
Lennart Poettering 2018-02-14 14:28:17 +01:00
parent 6b7b0f3947
commit 0295642dda
1 changed files with 9 additions and 0 deletions
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9
src/basic/terminal-util.c
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@ -68,6 +68,9 @@ static volatile int cached_underline_enabled = -1;
int chvt(int vt) {
_cleanup_close_ int fd;
/* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go,
* if that's configured. */
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return -errno;
@ -1205,6 +1208,12 @@ bool terminal_is_dumb(void) {
bool colors_enabled(void) {
/* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first
* (which is the explicit way to turn off/on colors). If that didn't work we turn off colors unless we are on a
* TTY. And if we are on a TTY we turn it off if $TERM is set to "dumb". There's one special tweak though: if
* we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open
* continously due to fear of SAK, and hence things are a bit weird. */
if (cached_colors_enabled < 0) {
int val;