journalctl: reset cached column count on SIGWINCH

This requires a little bit of tip-toeing around to explicitly avoid
touching the environment from a sig handler. Instead, simply create a
function to reset the var to its "unset" state, allowing the next call
to columns() to recalculate and cache the new value.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/shared/util.h b/src/shared/util.h
index e1d4735ee3..61b88a8b2e 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -385,6 +385,7 @@ int status_welcome(void);
 int fd_columns(int fd);
 unsigned columns(void);
 unsigned columns_uncached(void);
+void columns_cache_reset(int _unused_ signum);
 
 int fd_lines(int fd);
 unsigned lines(void);