Taken from: https://gitlab.freedesktop.org/xorg/lib/libxcb/-/commit/6a7661f60a70ff42c64b32a725edcbee790d1c0d From 6a7661f60a70ff42c64b32a725edcbee790d1c0d Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Tue, 8 Jul 2025 13:29:00 +0200 Subject: [PATCH] Get rid of PATH_MAX There could be no upper limit on the length of a path according to POSIX, therefore these macros may not be defined at all on some systems (such as GNU Hurd). There is however a limit on sizeof(struct sockaddr_un.sun_path), so use it. Signed-off-by: Samuel Thibault Part-of: --- src/xcb_util.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/xcb_util.c b/src/xcb_util.c index 5124d14..017583e 100644 --- a/src/xcb_util.c +++ b/src/xcb_util.c @@ -104,7 +104,9 @@ static int _xcb_parse_display_path_to_socket(const char *name, char **host, char int *displayp, int *screenp) { struct stat sbuf; - char path[PATH_MAX]; + /* In addition to the AF_UNIX path, there may be a screen number. + * The trailing \0 is already accounted in the size of sun_path. */ + char path[sizeof(((struct sockaddr_un*)0)->sun_path) + 1 + 10]; size_t len; int _screen = 0, res; -- GitLab