plan9port

commit 112744e54bfdab025bd2146457f41f1f8f4a903b
parent 4798a8a5560552480efde5fe8b1f7963a25a96d3
Author: Xiao-Yong Jin <xjin@anl.gov>
Date:   Wed, 14 Mar 2018 20:27:46 -0500

9pfuse: retries read(3) upon EINTR

read(3) sometimes errors with EINTR on macOS over slow connections.
9pfuse(1) now retries read(3) instead of sysfatal(3)ing.

Diffstat:
M
src/cmd/9pfuse/fuse.c
 | 
7
+++++--

1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/cmd/9pfuse/fuse.c b/src/cmd/9pfuse/fuse.c
@@ -48,7 +48,6 @@ readfusemsg(void)
 	int n, nn;
 	
 	m = allocfusemsg();
-	errno = 0;
 	/*
 	 * The FUSE kernel device apparently guarantees
 	 * that this read will return exactly one message.
@@ -57,7 +56,11 @@ readfusemsg(void)
 	 * FUSE returns an ENODEV error, not EOF,
 	 * when the connection is unmounted.
 	 */
-	if((n = read(fusefd, m->buf, fusebufsize)) < 0){
+	do{
+		errno = 0;
+		n = read(fusefd, m->buf, fusebufsize);
+	}while(n < 0 && errno == EINTR);
+	if(n < 0){
 		if(errno != ENODEV)
 			sysfatal("readfusemsg: %r");
 	}