1 files changed, 19 insertions, 0 deletions
diff --git a/io.c b/io.c
index b4688c89..b3819c01 100644
--- a/io.c
+++ b/io.c
@@ -1085,6 +1085,25 @@ getredirect(const char *str, int len)
 	return NULL;
 }
 
+/* is_non_fatal_std --- return true if fp is stdout/stderr and nonfatal */
+
+bool
+is_non_fatal_std(FILE *fp)
+{
+	if (in_PROCINFO("nonfatal", NULL, NULL))
+		return true;
+
+	/* yucky logic. sigh. */
+	if (fp == stdout) {
+		return (   in_PROCINFO("-", "nonfatal", NULL) != NULL
+		        || in_PROCINFO("/dev/stdout", "nonfatal", NULL) != NULL);
+	} else if (fp == stderr) {
+		return (in_PROCINFO("/dev/stderr", "nonfatal", NULL) != NULL);
+	}
+
+	return false;
+}
+
 /* close_one --- temporarily close an open file to re-use the fd */
 
 static void