Check for and work around buggy fflush(NULL).

Some really old platforms (eg SunOS4) segfault on fflush(NULL) so check
for and work around.  With klausz at haus-gisela.de.

1 files changed, 16 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-misc.c b/openbsd-compat/bsd-misc.c
index f7187daf8..3daf61071 100644
--- a/openbsd-compat/bsd-misc.c
+++ b/openbsd-compat/bsd-misc.c
@@ -308,3 +308,19 @@ getsid(pid_t pid)
 }
 #endif
 
+#ifdef FFLUSH_NULL_BUG
+#undef fflush
+int _ssh_compat_fflush(FILE *f)
+{
+        int r1, r2, r3;
+
+        if (f == NULL) {
+                r2 = fflush(stdout);
+                r3 = fflush(stderr);
+                if (r1 == -1 || r2 == -1 || r3 == -1)
+                        return -1;
+                return 0;
+        }
+        return fflush(f);
+}
+#endif