swaymsg: add timeout and type checks

This adds a 3 second timeout to the initial reply in swaymsg. This
prevents swaymsg from hanging when `swaymsg -t get_{inputs,seats}` is
used in i3. The timeout is removed when waiting for a subscribed event
or monitoring for subscribed events.

This also adds type checks to commands where i3 does not reply with all
of the properties that sway does (such as `modes` in `get_outputs`).

This is mostly just a behavioral adjustment since swaymsg should run on
i3. When running under i3, some command reply's (such as the one for
`get_outputs) may have more useful information in the raw json than the
pretty printed version.

1 files changed, 10 insertions, 0 deletions

diff --git a/common/ipc-client.c b/common/ipc-client.c
index 13e2dfa3..b6c03d13 100644
--- a/common/ipc-client.c
+++ b/common/ipc-client.c
@@ -69,6 +69,16 @@ int ipc_open_socket(const char *socket_path) {
         return socketfd;
 }
 
+bool ipc_set_recv_timeout(int socketfd, struct timeval tv) {
+        if (setsockopt(socketfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1) {
+                sway_log_errno(SWAY_ERROR, "Failed to set ipc recv timeout");
+                return false;
+        }
+        sway_log(SWAY_DEBUG, "ipc recv timeout set to %ld.%06ld",
+                        tv.tv_sec, tv.tv_usec);
+        return true;
+}
+
 struct ipc_response *ipc_recv_response(int socketfd) {
         char data[IPC_HEADER_SIZE];
         uint32_t *data32 = (uint32_t *)(data + sizeof(ipc_magic));