Stop the sendfile loop at the end of a short slot

sendfile returns zero at the end of the file, and the loop only ended
once the offset reached the size recorded when the slot was opened, so
a slot cut shorter in between spun the request forever. Only Linux
builds this path. A stand-in header type checked it here.

1 file changed, 4 insertions, 0 deletions

diff --git a/source/cache.c b/source/cache.cindex 62bb623..60e071b 100644--- a/source/cache.c+++ b/source/cache.c@@ -150,6 +150,10 @@ static int print_slot(struct cache_slot *slot) 				break; 			return errno; 		}+		// Zero means the file ended short of the size it had when it+		// was opened, and the read loop below finds that end.+		if (ret == 0)+			break; 		if (off == size) 			return 0; 	} while (1);
diff --git a/source/cache.c b/source/cache.c
index 62bb623..60e071b 100644
--- a/source/cache.c
+++ b/source/cache.c
@@ -150,6 +150,10 @@ static int print_slot(struct cache_slot *slot)
 				break;
 			return errno;
 		}
+		// Zero means the file ended short of the size it had when it
+		// was opened, and the read loop below finds that end.
+		if (ret == 0)
+			break;
 		if (off == size)
 			return 0;
 	} while (1);