From c3ae85a004c8714fc653629a983327d9a15b36da Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Thu, 14 Jan 2021 09:59:54 -0500
Subject: rc: do not exit on EINTR from read

This happens if lldb attaches to rc.
---
 src/cmd/rc/io.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/cmd/rc')

diff --git a/src/cmd/rc/io.c b/src/cmd/rc/io.c
index c2e9d7b4..907ba86f 100644
--- a/src/cmd/rc/io.c
+++ b/src/cmd/rc/io.c
@@ -1,4 +1,5 @@
 #include <limits.h>
+#include <errno.h>
 #include "rc.h"
 #include "exec.h"
 #include "io.h"
@@ -257,7 +258,15 @@ int
 emptybuf(io *f)
 {
 	int n;
-	if(f->fd==-1 || (n = Read(f->fd, f->buf, NBUF))<=0) return EOF;
+	if(f->fd==-1)
+		return EOF;
+Loop:
+	errno = 0;
+	n = Read(f->fd, f->buf, NBUF);
+	if(n < 0 && errno == EINTR)
+		goto Loop;
+	if(n <= 0)
+		return EOF;
 	f->bufp = f->buf;
 	f->ebuf = f->buf+n;
 	return *f->bufp++&0xff;
-- 
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