Handle partial reads of the execvp error string

It is possible that reading the entire error string requires multiple
read() calls.

1 files changed, 6 insertions, 1 deletions

diff --git a/master.c b/master.c
index 75f4926..6d6d4d2 100644
--- a/master.c
+++ b/master.c
@@ -672,7 +672,12 @@ master_main(char **argv, int waitattach, int dontfork)
 		len = read(fd[0], buf, sizeof(buf));
 		if (len > 0)
 		{
-			write_buf_or_fail(2, buf, len);
+			do
+			{
+				write_buf_or_fail(2, buf, len);
+				len = read(fd[0], buf, sizeof(buf));
+			} while (len > 0);
+
 			kill(pid, SIGTERM);
 			return 1;
 		}