[glib/3v1n0/strerror_r-int-variant-support: 1/3] gbacktrace: Handle case of strerror_r returning an int value

[Marco Trevisan <marcotrevi src gnome org>]

commit 640e586251380ee8768c01118db56d2a42557693
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed Jul 6 23:45:39 2022 +0200

    gbacktrace: Handle case of strerror_r returning an int value
    
    As it's the case in FreeBSD and Mac OS X.

 glib/gbacktrace.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/glib/gbacktrace.c b/glib/gbacktrace.c
index ae4bdec0c7..6f4604e1fd 100644
--- a/glib/gbacktrace.c
+++ b/glib/gbacktrace.c
@@ -323,8 +323,13 @@ stack_trace_sigchld (int signum)
 static inline const char *
 get_strerror (char *buffer, gsize n)
 {
-#ifdef HAVE_STRERROR_R
+#if defined(STRERROR_R_CHAR_P)
   return strerror_r (errno, buffer, n);
+#elif defined(HAVE_STRERROR_R)
+  int ret = strerror_r (errno, buffer, n);
+  if (ret == 0 || ret == EINVAL)
+    return buffer;
+  return NULL;
 #else
   const char *error_str = strerror (errno);
   if (!error_str)