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Taken from:
https://gitlab.freedesktop.org/xorg/lib/libxcb/-/commit/6a7661f60a70ff42c64b32a725edcbee790d1c0d
From 6a7661f60a70ff42c64b32a725edcbee790d1c0d Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
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 <samuel.thibault@ens-lyon.org>
Part-of: <https://gitlab.freedesktop.org/xorg/lib/libxcb/-/merge_requests/65>
---
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;
--
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