Try to detect and remove stale sockets when dtach -A is used. Be

paranoid about this, and only remove the specified file if connect says
the connection was refused and stat says the file is a socket.

Also dtach -A now only tries to create the socket if the connection was
refused or the socket did not exist, instead of on any random error as
before.

1 files changed, 7 insertions, 2 deletions

diff --git a/main.c b/main.c
index 6687c16..0064450 100644
--- a/main.c
+++ b/main.c
@@ -256,8 +256,13 @@ main(int argc, char **argv)
 		** socket. */
 		if (attach_main(1) != 0)
 		{
-			if (master_main(argv, 1) != 0)
-				return 1;
+			if (errno == ECONNREFUSED || errno == ENOENT)
+			{
+				if (errno == ECONNREFUSED)
+					unlink(sockname);
+				if (master_main(argv, 1) != 0)
+					return 1;
+			}
 			return attach_main(0);
 		}
 	}