1 files changed, 2 insertions, 2 deletions
diff --git a/unix/tclUnixChan.c b/unix/tclUnixChan.c
index cabe3e5..b515e37 100644
--- a/unix/tclUnixChan.c
+++ b/unix/tclUnixChan.c
@@ -275,7 +275,7 @@ FileInputProc(
      */
 
     bytesRead = read(fsPtr->fd, buf, toRead);
-    if (bytesRead > -1) {
+    if (bytesRead >= 0) {
 	return bytesRead;
     }
     *errorCodePtr = errno;
@@ -322,7 +322,7 @@ FileOutputProc(
 	return 0;
     }
     written = write(fsPtr->fd, buf, toWrite);
-    if (written > -1) {
+    if (written >= 0) {
 	return written;
     }
     *errorCodePtr = errno;