lbutils/file: ignore close err if errno is EINTR

but DONT LOOP IT. see comment.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/libreboot-utils/lib/file.c

@@ -717,10 +717,30 @@ xclose(int *fd)
 	if (*fd < 0)
 		return;
 
+	/* nuance regarding EINTR on close():
+	 * EINTR can be set on error, but there's
+	 * no guarantee whether the fd is then still
+	 * open or closed. on some other commands, we
+	 * loop EINTR, but for close, we instead skip
+	 * aborting *if the errno is EINTR* - so don't
+	 * loop it, but do regard EINTR with rval -1
+	 * as essenitally a successful close()
+	 */
+
+	/* because we don't want to mess with someone
+	 * elses file if that fd is then reassigned.
+	 * if the operation truly did fail, we ignore
+	 * it. just leave it flying in the wind */
+
 	errno = 0;
-	if ((rval = close(*fd)) < 0)
+	if ((rval = close(*fd)) < 0) {
+		if (errno != EINTR)
 			exitf("xclose: could not close");
 
+		/* regard EINTR as a successful close */
+		rval = 0;
+	}
+
 	*fd = -1;
 
 	reset_caller_errno(rval);