Merge pull request #2920 from CyberShadow/monitor-output-names

Consider RandR 1.5's monitors' output names in addition to monitor names

docs/userguide

@@ -869,6 +869,18 @@ The 'output' is the name of the RandR output you attach your screen to. On a
 laptop, you might have VGA1 and LVDS1 as output names. You can see the
 available outputs by running +xrandr --current+.
 
+If your X server supports RandR 1.5 or newer, i3 will use RandR monitor objects
+instead of output objects. Run +xrandr --listmonitors+ to see a list. Usually,
+a monitor object contains exactly one output, and has the same name as the
+output; but should that not be the case, you may specify the name of either the
+monitor or the output in i3's configuration. For example, the Dell UP2414Q uses
+two scalers internally, so its output names might be “DP1” and “DP2”, but the
+monitor name is “Dell UP2414Q”.
+
+(Note that even if you specify the name of an output which doesn't span the
+entire monitor, i3 will still use the entire area of the containing monitor
+rather than that of just the output's.)
+
 If you use named workspaces, they must be quoted:
 
 *Examples*:

include/data.h

@@ -349,6 +349,13 @@ struct Autostart {
     autostarts_always;
 };
 
+struct output_name {
+    char *name;
+
+    SLIST_ENTRY(output_name)
+    names;
+};
+
 /**
  * An Output is a physical output on your graphics driver. Outputs which
  * are currently in use have (output->active == true). Each output has a
@@ -370,8 +377,11 @@ struct xoutput {
     bool to_be_disabled;
     bool primary;
 
-    /** Name of the output */
+    /** List of names for the output.
-    char *name;
+     * An output always has at least one name; the first name is
+     * considered the primary one. */
+    SLIST_HEAD(names_head, output_name)
+    names_head;
 
     /** Pointer to the Con which represents this output */
     Con *con;

include/output.h

@@ -24,6 +24,12 @@ Con *output_get_content(Con *output);
  */
 Output *get_output_from_string(Output *current_output, const char *output_str);
 
+/**
+ * Retrieves the primary name of an output.
+ *
+ */
+char *output_primary_name(Output *output);
+
 /**
  * Returns the output for the given con.
  *

src/con.c

@@ -1264,7 +1264,7 @@ void con_move_to_output(Con *con, Output *output) {
     Con *ws = NULL;
     GREP_FIRST(ws, output_get_content(output->con), workspace_is_visible(child));
     assert(ws != NULL);
-    DLOG("Moving con %p to output %s\n", con, output->name);
+    DLOG("Moving con %p to output %s\n", con, output_primary_name(output));
     con_move_to_workspace(con, ws, false, false, false);
 }
 

src/fake_outputs.c

@@ -47,9 +47,12 @@ void fake_outputs_init(const char *output_spec) {
             new_output->rect.width = min(new_output->rect.width, width);
             new_output->rect.height = min(new_output->rect.height, height);
         } else {
+            struct output_name *output_name = scalloc(1, sizeof(struct output_name));
             new_output = scalloc(1, sizeof(Output));
-            sasprintf(&(new_output->name), "fake-%d", num_screens);
+            sasprintf(&(output_name->name), "fake-%d", num_screens);
-            DLOG("Created new fake output %s (%p)\n", new_output->name, new_output);
+            SLIST_INIT(&(new_output->names_head));
+            SLIST_INSERT_HEAD(&(new_output->names_head), output_name, names);
+            DLOG("Created new fake output %s (%p)\n", output_primary_name(new_output), new_output);
             new_output->active = true;
             new_output->rect.x = x;
             new_output->rect.y = y;

src/handlers.c

@@ -388,7 +388,7 @@ static void handle_configure_request(xcb_configure_request_event_t *event) {
             Con *current_output = con_get_output(con);
             Output *target = get_output_containing(x, y);
             if (target != NULL && current_output != target->con) {
-                DLOG("Dock client is requested to be moved to output %s, moving it there.\n", target->name);
+                DLOG("Dock client is requested to be moved to output %s, moving it there.\n", output_primary_name(target));
                 Match *match;
                 Con *nc = con_for_window(target->con, con->window, &match);
                 DLOG("Dock client will be moved to container %p.\n", nc);

src/ipc.c

@@ -579,6 +579,11 @@ static void dump_bar_bindings(yajl_gen gen, Barconfig *config) {
     y(array_close);
 }
 
+static char *canonicalize_output_name(char *name) {
+    Output *output = get_output_by_name(name, false);
+    return output ? output_primary_name(output) : name;
+}
+
 static void dump_bar_config(yajl_gen gen, Barconfig *config) {
     y(map_open);
 
@@ -588,8 +593,13 @@ static void dump_bar_config(yajl_gen gen, Barconfig *config) {
     if (config->num_outputs > 0) {
         ystr("outputs");
         y(array_open);
-        for (int c = 0; c < config->num_outputs; c++)
+        for (int c = 0; c < config->num_outputs; c++) {
-            ystr(config->outputs[c]);
+            /* Convert monitor names (RandR ≥ 1.5) or output names
+             * (RandR < 1.5) into monitor names. This way, existing
+             * configs which use output names transparently keep
+             * working. */
+            ystr(canonicalize_output_name(config->outputs[c]));
+        }
         y(array_close);
     }
 
@@ -599,7 +609,7 @@ static void dump_bar_config(yajl_gen gen, Barconfig *config) {
 
         struct tray_output_t *tray_output;
         TAILQ_FOREACH(tray_output, &(config->tray_outputs), tray_outputs) {
-            ystr(tray_output->output);
+            ystr(canonicalize_output_name(tray_output->output));
         }
 
         y(array_close);
@@ -829,7 +839,7 @@ IPC_HANDLER(get_outputs) {
         y(map_open);
 
         ystr("name");
-        ystr(output->name);
+        ystr(output_primary_name(output));
 
         ystr("active");
         y(bool, output->active);

src/main.c

@@ -687,7 +687,7 @@ int main(int argc, char *argv[]) {
         TAILQ_FOREACH(con, &(croot->nodes_head), nodes) {
             Output *output;
             TAILQ_FOREACH(output, &outputs, outputs) {
-                if (output->active || strcmp(con->name, output->name) != 0)
+                if (output->active || strcmp(con->name, output_primary_name(output)) != 0)
                     continue;
 
                 /* This will correctly correlate the output with its content

src/manage.c

@@ -219,7 +219,7 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
         LOG("This window is of type dock\n");
         Output *output = get_output_containing(geom->x, geom->y);
         if (output != NULL) {
-            DLOG("Starting search at output %s\n", output->name);
+            DLOG("Starting search at output %s\n", output_primary_name(output));
             search_at = output->con;
         }
 

src/output.c

@@ -44,6 +44,14 @@ Output *get_output_from_string(Output *current_output, const char *output_str) {
     return get_output_by_name(output_str, true);
 }
 
+/*
+ * Retrieves the primary name of an output.
+ *
+ */
+char *output_primary_name(Output *output) {
+    return SLIST_FIRST(&output->names_head)->name;
+}
+
 Output *get_output_for_con(Con *con) {
     Con *output_con = con_get_output(con);
     if (output_con == NULL) {

src/randr.c

@@ -48,10 +48,18 @@ Output *get_output_by_name(const char *name, const bool require_active) {
     Output *output;
     bool get_primary = (strcasecmp("primary", name) == 0);
     TAILQ_FOREACH(output, &outputs, outputs) {
-        if ((output->primary && get_primary) ||
+        if (output->primary && get_primary) {
-            ((!require_active || output->active) && strcasecmp(output->name, name) == 0)) {
             return output;
         }
+        if (require_active && !output->active) {
+            continue;
+        }
+        struct output_name *output_name;
+        SLIST_FOREACH(output_name, &output->names_head, names) {
+            if (strcasecmp(output_name->name, name) == 0) {
+                return output;
+            }
+        }
     }
 
     return NULL;
@@ -178,7 +186,7 @@ Output *get_output_next_wrap(direction_t direction, Output *current) {
     }
     if (!best)
         best = current;
-    DLOG("current = %s, best = %s\n", current->name, best->name);
+    DLOG("current = %s, best = %s\n", output_primary_name(current), output_primary_name(best));
     return best;
 }
 
@@ -250,7 +258,7 @@ Output *get_output_next(direction_t direction, Output *current, output_close_far
         }
     }
 
-    DLOG("current = %s, best = %s\n", current->name, (best ? best->name : "NULL"));
+    DLOG("current = %s, best = %s\n", output_primary_name(current), (best ? output_primary_name(best) : "NULL"));
     return best;
 }
 
@@ -266,7 +274,11 @@ Output *create_root_output(xcb_connection_t *conn) {
     s->rect.y = 0;
     s->rect.width = root_screen->width_in_pixels;
     s->rect.height = root_screen->height_in_pixels;
-    s->name = "xroot-0";
+
+    struct output_name *output_name = scalloc(1, sizeof(struct output_name));
+    output_name->name = "xroot-0";
+    SLIST_INIT(&s->names_head);
+    SLIST_INSERT_HEAD(&s->names_head, output_name, names);
 
     return s;
 }
@@ -280,12 +292,12 @@ void output_init_con(Output *output) {
     Con *con = NULL, *current;
     bool reused = false;
 
-    DLOG("init_con for output %s\n", output->name);
+    DLOG("init_con for output %s\n", output_primary_name(output));
 
     /* Search for a Con with that name directly below the root node. There
      * might be one from a restored layout. */
     TAILQ_FOREACH(current, &(croot->nodes_head), nodes) {
-        if (strcmp(current->name, output->name) != 0)
+        if (strcmp(current->name, output_primary_name(output)) != 0)
             continue;
 
         con = current;
@@ -297,7 +309,7 @@ void output_init_con(Output *output) {
     if (con == NULL) {
         con = con_new(croot, NULL);
         FREE(con->name);
-        con->name = sstrdup(output->name);
+        con->name = sstrdup(output_primary_name(output));
         con->type = CT_OUTPUT;
         con->layout = L_OUTPUT;
         con_fix_percent(croot);
@@ -384,7 +396,7 @@ void init_ws_for_output(Output *output, Con *content) {
     /* go through all assignments and move the existing workspaces to this output */
     struct Workspace_Assignment *assignment;
     TAILQ_FOREACH(assignment, &ws_assignments, ws_assignments) {
-        if (strcmp(assignment->output, output->name) != 0)
+        if (strcmp(assignment->output, output_primary_name(output)) != 0)
             continue;
 
         /* check if this workspace actually exists */
@@ -402,13 +414,13 @@ void init_ws_for_output(Output *output, Con *content) {
             LOG("Workspace \"%s\" assigned to output \"%s\", but it is already "
                 "there. Do you have two assignment directives for the same "
                 "workspace in your configuration file?\n",
-                workspace->name, output->name);
+                workspace->name, output_primary_name(output));
             continue;
         }
 
         /* if so, move it over */
         LOG("Moving workspace \"%s\" from output \"%s\" to \"%s\" due to assignment\n",
-            workspace->name, workspace_out->name, output->name);
+            workspace->name, workspace_out->name, output_primary_name(output));
 
         /* if the workspace is currently visible on that output, we need to
          * switch to a different workspace - otherwise the output would end up
@@ -445,7 +457,7 @@ void init_ws_for_output(Output *output, Con *content) {
                 workspace_out->name);
             init_ws_for_output(get_output_by_name(workspace_out->name, true),
                                output_get_content(workspace_out));
-            DLOG("Done re-initializing, continuing with \"%s\"\n", output->name);
+            DLOG("Done re-initializing, continuing with \"%s\"\n", output_primary_name(output));
         }
     }
 
@@ -465,7 +477,7 @@ void init_ws_for_output(Output *output, Con *content) {
 
     /* otherwise, we create the first assigned ws for this output */
     TAILQ_FOREACH(assignment, &ws_assignments, ws_assignments) {
-        if (strcmp(assignment->output, output->name) != 0)
+        if (strcmp(assignment->output, output_primary_name(output)) != 0)
             continue;
 
         LOG("Initializing first assigned workspace \"%s\" for output \"%s\"\n",
@@ -594,7 +606,42 @@ static bool randr_query_outputs_15(void) {
         Output *new = get_output_by_name(name, false);
         if (new == NULL) {
             new = scalloc(1, sizeof(Output));
-            new->name = sstrdup(name);
+
+            SLIST_INIT(&new->names_head);
+
+            /* Register associated output names in addition to the monitor name */
+            xcb_randr_output_t *randr_outputs = xcb_randr_monitor_info_outputs(monitor_info);
+            int randr_output_len = xcb_randr_monitor_info_outputs_length(monitor_info);
+            for (int i = 0; i < randr_output_len; i++) {
+                xcb_randr_output_t randr_output = randr_outputs[i];
+
+                xcb_randr_get_output_info_reply_t *info =
+                    xcb_randr_get_output_info_reply(conn,
+                                                    xcb_randr_get_output_info(conn, randr_output, monitors->timestamp),
+                                                    NULL);
+
+                if (info != NULL && info->crtc != XCB_NONE) {
+                    char *oname;
+                    sasprintf(&oname, "%.*s",
+                              xcb_randr_get_output_info_name_length(info),
+                              xcb_randr_get_output_info_name(info));
+
+                    if (strcmp(name, oname) != 0) {
+                        struct output_name *output_name = scalloc(1, sizeof(struct output_name));
+                        output_name->name = sstrdup(oname);
+                        SLIST_INSERT_HEAD(&new->names_head, output_name, names);
+                    } else {
+                        free(oname);
+                    }
+                }
+                FREE(info);
+            }
+
+            /* Insert the monitor name last, so that it's used as the primary name */
+            struct output_name *output_name = scalloc(1, sizeof(struct output_name));
+            output_name->name = sstrdup(name);
+            SLIST_INSERT_HEAD(&new->names_head, output_name, names);
+
             if (monitor_info->primary) {
                 TAILQ_INSERT_HEAD(&outputs, new, outputs);
             } else {
@@ -643,16 +690,25 @@ static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 
     Output *new = get_output_by_id(id);
     bool existing = (new != NULL);
-    if (!existing)
+    if (!existing) {
         new = scalloc(1, sizeof(Output));
+        SLIST_INIT(&new->names_head);
+    }
     new->id = id;
     new->primary = (primary && primary->output == id);
-    FREE(new->name);
+    while (!SLIST_EMPTY(&new->names_head)) {
-    sasprintf(&new->name, "%.*s",
+        FREE(SLIST_FIRST(&new->names_head)->name);
+        struct output_name *old_head = SLIST_FIRST(&new->names_head);
+        SLIST_REMOVE_HEAD(&new->names_head, names);
+        FREE(old_head);
+    }
+    struct output_name *output_name = scalloc(1, sizeof(struct output_name));
+    sasprintf(&output_name->name, "%.*s",
               xcb_randr_get_output_info_name_length(output),
               xcb_randr_get_output_info_name(output));
+    SLIST_INSERT_HEAD(&new->names_head, output_name, names);
 
-    DLOG("found output with name %s\n", new->name);
+    DLOG("found output with name %s\n", output_primary_name(new));
 
     /* Even if no CRTC is used at the moment, we store the output so that
      * we do not need to change the list ever again (we only update the
@@ -672,7 +728,7 @@ static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
     icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
     if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
         DLOG("Skipping output %s: could not get CRTC (%p)\n",
-             new->name, crtc);
+             output_primary_name(new), crtc);
         free(new);
         return;
     }
@@ -789,7 +845,7 @@ void randr_query_outputs(void) {
         if (!output->active || output->to_be_disabled)
             continue;
         DLOG("output %p / %s, position (%d, %d), checking for clones\n",
-             output, output->name, output->rect.x, output->rect.y);
+             output, output_primary_name(output), output->rect.x, output->rect.y);
 
         for (other = output;
              other != TAILQ_END(&outputs);
@@ -813,7 +869,7 @@ void randr_query_outputs(void) {
             update_if_necessary(&(other->rect.width), width);
             update_if_necessary(&(other->rect.height), height);
 
-            DLOG("disabling output %p (%s)\n", other, other->name);
+            DLOG("disabling output %p (%s)\n", other, output_primary_name(other));
             other->to_be_disabled = true;
 
             DLOG("new output mode %d x %d, other mode %d x %d\n",
@@ -828,7 +884,7 @@ void randr_query_outputs(void) {
      * LVDS1 gets disabled. */
     TAILQ_FOREACH(output, &outputs, outputs) {
         if (output->active && output->con == NULL) {
-            DLOG("Need to initialize a Con for output %s\n", output->name);
+            DLOG("Need to initialize a Con for output %s\n", output_primary_name(output));
             output_init_con(output);
             output->changed = false;
         }
@@ -854,7 +910,7 @@ void randr_query_outputs(void) {
         Con *content = output_get_content(output->con);
         if (!TAILQ_EMPTY(&(content->nodes_head)))
             continue;
-        DLOG("Should add ws for output %s\n", output->name);
+        DLOG("Should add ws for output %s\n", output_primary_name(output));
         init_ws_for_output(output, content);
     }
 
@@ -863,7 +919,7 @@ void randr_query_outputs(void) {
         if (!output->primary || !output->con)
             continue;
 
-        DLOG("Focusing primary output %s\n", output->name);
+        DLOG("Focusing primary output %s\n", output_primary_name(output));
         con_focus(con_descend_focused(output->con));
     }
 
@@ -881,7 +937,7 @@ void randr_disable_output(Output *output) {
     assert(output->to_be_disabled);
 
     output->active = false;
-    DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
+    DLOG("Output %s disabled, re-assigning workspaces/docks\n", output_primary_name(output));
 
     Output *first = get_first_output();
 

src/tree.c

@@ -537,7 +537,7 @@ static bool _tree_next(Con *con, char way, orientation_t orientation, bool wrap)
 
         if (!current_output)
             return false;
-        DLOG("Current output is %s\n", current_output->name);
+        DLOG("Current output is %s\n", output_primary_name(current_output));
 
         /* Try to find next output */
         direction_t direction;
@@ -555,7 +555,7 @@ static bool _tree_next(Con *con, char way, orientation_t orientation, bool wrap)
         next_output = get_output_next(direction, current_output, CLOSEST_OUTPUT);
         if (!next_output)
             return false;
-        DLOG("Next output is %s\n", next_output->name);
+        DLOG("Next output is %s\n", output_primary_name(next_output));
 
         /* Find visible workspace on next output */
         Con *workspace = NULL;

src/workspace.c

@@ -188,7 +188,7 @@ Con *create_workspace_on_output(Output *output, Con *content) {
         struct Workspace_Assignment *assignment;
         TAILQ_FOREACH(assignment, &ws_assignments, ws_assignments) {
             if (strcmp(assignment->name, target_name) != 0 ||
-                strcmp(assignment->output, output->name) == 0)
+                strcmp(assignment->output, output_primary_name(output)) == 0)
                 continue;
 
             assigned = true;
@@ -935,7 +935,7 @@ bool workspace_move_to_output(Con *ws, const char *name) {
         bool used_assignment = false;
         struct Workspace_Assignment *assignment;
         TAILQ_FOREACH(assignment, &ws_assignments, ws_assignments) {
-            if (assignment->output == NULL || strcmp(assignment->output, current_output->name) != 0)
+            if (assignment->output == NULL || strcmp(assignment->output, output_primary_name(current_output)) != 0)
                 continue;
 
             /* check if this workspace is already attached to the tree */

src/xinerama.c

@@ -55,8 +55,11 @@ static void query_screens(xcb_connection_t *conn) {
             s->rect.height = min(s->rect.height, screen_info[screen].height);
         } else {
             s = scalloc(1, sizeof(Output));
-            sasprintf(&(s->name), "xinerama-%d", num_screens);
+            struct output_name *output_name = scalloc(1, sizeof(struct output_name));
-            DLOG("Created new Xinerama screen %s (%p)\n", s->name, s);
+            sasprintf(&output_name->name, "xinerama-%d", num_screens);
+            SLIST_INIT(&s->names_head);
+            SLIST_INSERT_HEAD(&s->names_head, output_name, names);
+            DLOG("Created new Xinerama screen %s (%p)\n", output_primary_name(s), s);
             s->active = true;
             s->rect.x = screen_info[screen].x_org;
             s->rect.y = screen_info[screen].y_org;

testcases/inject_randr1.5.c

@@ -41,9 +41,14 @@ void cleanup_socket(void) {
     }
 }
 
+struct injected_reply {
+    void *buf;
+    off_t len;
+};
+
 /* BEGIN RandR 1.5 specific */
-static void *injected_reply = NULL;
+static struct injected_reply getmonitors_reply = {NULL, 0};
-static off_t injected_reply_len = 0;
+static struct injected_reply getoutputinfo_reply = {NULL, 0};
 /* END RandR 1.5 specific */
 
 #define XCB_PAD(i) (-(i)&3)
@@ -66,6 +71,8 @@ struct connstate {
     int getext_randr;
     /* sequence number of the most recent RRGetMonitors request */
     int getmonitors;
+    /* sequence number of the most recent RRGetOutputInfo request */
+    int getoutputinfo;
 
     int randr_major_opcode;
     /* END RandR 1.5 specific */
@@ -259,6 +266,8 @@ static void read_client_x11_packet_cb(EV_P_ ev_io *w, int revents) {
         const uint8_t randr_opcode = ((generic_x11_request_t *)request)->pad0;
         if (randr_opcode == XCB_RANDR_GET_MONITORS) {
             connstate->getmonitors = connstate->sequence;
+        } else if (randr_opcode == XCB_RANDR_GET_OUTPUT_INFO) {
+            connstate->getoutputinfo = connstate->sequence;
         }
     }
     /* END RandR 1.5 specific */
@@ -267,6 +276,32 @@ static void read_client_x11_packet_cb(EV_P_ ev_io *w, int revents) {
     free(request);
 }
 
+static bool handle_sequence(struct connstate *connstate, uint16_t sequence) {
+    /* BEGIN RandR 1.5 specific */
+    if (sequence == connstate->getmonitors) {
+        printf("RRGetMonitors reply!\n");
+        if (getmonitors_reply.buf != NULL) {
+            printf("injecting reply\n");
+            ((generic_x11_reply_t *)getmonitors_reply.buf)->sequence = sequence;
+            must_write(writeall(connstate->clientw->fd, getmonitors_reply.buf, getmonitors_reply.len));
+            return true;
+        }
+    }
+
+    if (sequence == connstate->getoutputinfo) {
+        printf("RRGetOutputInfo reply!\n");
+        if (getoutputinfo_reply.buf != NULL) {
+            printf("injecting reply\n");
+            ((generic_x11_reply_t *)getoutputinfo_reply.buf)->sequence = sequence;
+            must_write(writeall(connstate->clientw->fd, getoutputinfo_reply.buf, getoutputinfo_reply.len));
+            return true;
+        }
+    }
+    /* END RandR 1.5 specific */
+
+    return false;
+}
+
 static void read_server_x11_packet_cb(EV_P_ ev_io *w, int revents) {
     struct connstate *connstate = (struct connstate *)w->data;
     // all packets from the server are at least 32 bytes in length
@@ -274,9 +309,14 @@ static void read_server_x11_packet_cb(EV_P_ ev_io *w, int revents) {
     void *packet = smalloc(len);
     must_read(readall_into(packet, len, connstate->serverw->fd));
     switch (((generic_x11_reply_t *)packet)->code) {
-        case 0:  // error
+        case 0: {  // error
+            const uint16_t sequence = ((xcb_request_error_t *)packet)->sequence;
+            if (handle_sequence(connstate, sequence)) {
+                free(packet);
+                return;
+            }
             break;
-
+        }
         case 1:  // reply
             len += ((generic_x11_reply_t *)packet)->length * 4;
             if (len > 32) {
@@ -291,19 +331,13 @@ static void read_server_x11_packet_cb(EV_P_ ev_io *w, int revents) {
                 xcb_query_extension_reply_t *reply = packet;
                 connstate->randr_major_opcode = reply->major_opcode;
             }
-
-            if (sequence == connstate->getmonitors) {
-                printf("RRGetMonitors reply!\n");
-                if (injected_reply != NULL) {
-                    printf("injecting reply\n");
-                    ((generic_x11_reply_t *)injected_reply)->sequence = sequence;
-                    must_write(writeall(connstate->clientw->fd, injected_reply, injected_reply_len));
-                    free(packet);
-                    return;
-                }
-            }
             /* END RandR 1.5 specific */
 
+            if (handle_sequence(connstate, sequence)) {
+                free(packet);
+                return;
+            }
+
             break;
 
         default:  // event
@@ -322,7 +356,7 @@ static void child_cb(EV_P_ ev_child *w, int revents) {
     }
 }
 
-static void must_read_reply(const char *filename) {
+static void must_read_reply(const char *filename, struct injected_reply *reply) {
     FILE *f;
     if ((f = fopen(filename, "r")) == NULL) {
         err(EXIT_FAILURE, "fopen(%s)", filename);
@@ -331,11 +365,9 @@ static void must_read_reply(const char *filename) {
     if (fstat(fileno(f), &stbuf) != 0) {
         err(EXIT_FAILURE, "fstat(%s)", filename);
     }
-    /* BEGIN RandR 1.5 specific */
+    reply->len = stbuf.st_size;
-    injected_reply_len = stbuf.st_size;
+    reply->buf = smalloc(stbuf.st_size);
-    injected_reply = smalloc(stbuf.st_size);
+    int n = fread(reply->buf, 1, stbuf.st_size, f);
-    int n = fread(injected_reply, 1, stbuf.st_size, f);
-    /* END RandR 1.5 specific */
     if (n != stbuf.st_size) {
         err(EXIT_FAILURE, "fread(%s)", filename);
     }
@@ -345,6 +377,7 @@ static void must_read_reply(const char *filename) {
 int main(int argc, char *argv[]) {
     static struct option long_options[] = {
         {"getmonitors_reply", required_argument, 0, 0},
+        {"getoutputinfo_reply", required_argument, 0, 0},
         {0, 0, 0, 0},
     };
     char *options_string = "";
@@ -353,11 +386,15 @@ int main(int argc, char *argv[]) {
 
     while ((opt = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
         switch (opt) {
-            case 0:
+            case 0: {
-                if (strcmp(long_options[option_index].name, "getmonitors_reply") == 0) {
+                const char *option_name = long_options[option_index].name;
-                    must_read_reply(optarg);
+                if (strcmp(option_name, "getmonitors_reply") == 0) {
+                    must_read_reply(optarg, &getmonitors_reply);
+                } else if (strcmp(option_name, "getoutputinfo_reply") == 0) {
+                    must_read_reply(optarg, &getoutputinfo_reply);
                 }
                 break;
+            }
             default:
                 exit(EXIT_FAILURE);
         }

testcases/lib/SocketActivation.pm

@@ -145,7 +145,12 @@ sub activate_i3 {
         if ($args{inject_randr15}) {
             # See comment in $args{strace} branch.
             $cmd = 'test.inject_randr15 --getmonitors_reply="' .
-                   $args{inject_randr15} . '" -- ' .
+                   $args{inject_randr15} . '" ' .
+                   ($args{inject_randr15_outputinfo}
+                    ? '--getoutputinfo_reply="' .
+                      $args{inject_randr15_outputinfo} . '" '
+                    : '') .
+                   '-- ' .
                    'sh -c "export LISTEN_PID=\$\$; ' . $cmd . '"';
         }
 

testcases/lib/i3test.pm.in

@@ -864,6 +864,7 @@ sub launch_with_config {
         dont_create_temp_dir => $args{dont_create_temp_dir},
         validate_config => $args{validate_config},
         inject_randr15 => $args{inject_randr15},
+        inject_randr15_outputinfo => $args{inject_randr15_outputinfo},
     );
 
     # If we called i3 with -C, we wait for it to exit and then return as

testcases/t/533-randr15.t

@@ -20,10 +20,16 @@
 use File::Temp qw(tempfile);
 use i3test i3_autostart => 0;
 
+my $monitor_name = 'i3-fake-monitor';
+my $output_name = 'i3-fake-output';
+
 my $config = <<EOT;
 # i3 config file (v4)
 font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
 
+bar {
+    output $output_name
+}
 EOT
 
 my ($outfh, $outname) = tempfile('i3-randr15reply-XXXXXX', UNLINK => 1);
@@ -33,50 +39,81 @@ my ($outfh, $outname) = tempfile('i3-randr15reply-XXXXXX', UNLINK => 1);
 my $reply = pack('cxSLLLLx[LLL]',
      1, # reply
      0, # sequence (will be filled in by inject_randr15)
-     # 56 = length($reply) + length($monitor1)
+     # 60 = length($reply) + length($monitor1)
      # 32 = minimum X11 reply length
-     (56-32) / 4, # length in words
+     (60-32) / 4, # length in words
      0, # timestamp TODO
      1, # nmonitors
-     0); # noutputs
+     1); # noutputs
 
 # Manually intern _NET_CURRENT_DESKTOP as $x->atom will not create atoms if
 # they are not yet interned.
-my $atom_cookie = $x->intern_atom(0, length("DP3"), "DP3");
+my $atom_cookie = $x->intern_atom(0, length($monitor_name), $monitor_name);
-my $DP3 = $x->intern_atom_reply($atom_cookie->{sequence})->{atom};
+my $monitor_name_atom = $x->intern_atom_reply($atom_cookie->{sequence})->{atom};
 
 # MONITORINFO is defined in A.1.1 in
 # https://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt
-my $monitor1 = pack('LccSssSSLL',
+my $monitor1 = pack('LccSssSSLLL',
-        $DP3, # name (ATOM)
+        $monitor_name_atom, # name (ATOM)
         1, # primary
         1, # automatic
-        0, # ncrtcs
+        1, # ncrtcs
         0, # x
         0, # y
         3840, # width in pixels
         2160, # height in pixels
         520, # width in millimeters
-        290); # height in millimeters
+        290, # height in millimeters
+        12345); # output ID #0
 
 print $outfh $reply;
 print $outfh $monitor1;
 
 close($outfh);
 
-my $pid = launch_with_config($config, inject_randr15 => $outname);
+# Prepare a RRGetOutputInfo reply as well; see RRGetOutputInfo in
+# https://www.x.org/releases/current/doc/randrproto/randrproto.txt
+($outfh, my $outname_moninfo) = tempfile('i3-randr15reply-XXXXXX', UNLINK => 1);
+my $moninfo = pack('cxSLLLx[LLccSSSS]S a* x!4',
+                   1, # reply
+                   0, # sequence (will be filled in by inject_randr15)
+                   # 36 = length($moninfo) (without name and padding)
+                   # 32 = minimum X11 reply length
+                   ((36 + length($output_name) - 32) + 3) / 4, # length in words
+                   0, # timestamp TODO
+                   12345, # CRTC
+                   length($output_name), # length of name
+                   $output_name); # name
+
+print $outfh $moninfo;
+close($outfh);
+
+my $pid = launch_with_config($config,
+                             inject_randr15 => $outname,
+                             inject_randr15_outputinfo => $outname_moninfo);
 
 my $tree = i3->get_tree->recv;
 my @outputs = map { $_->{name} } @{$tree->{nodes}};
-is_deeply(\@outputs, [ '__i3', 'DP3' ], 'outputs are __i3 and DP3');
+is_deeply(\@outputs, [ '__i3', $monitor_name ], 'outputs are __i3 and the fake monitor');
 
-my ($dp3) = grep { $_->{name} eq 'DP3' } @{$tree->{nodes}};
+my ($output_data) = grep { $_->{name} eq $monitor_name } @{$tree->{nodes}};
-is_deeply($dp3->{rect}, {
+is_deeply($output_data->{rect}, {
         width => 3840,
         height => 2160,
         x => 0,
         y => 0,
-    }, 'Output DP3 at 3840x2160+0+0');
+    }, "Fake output at 3840x2160+0+0");
+
+# Verify that i3 canonicalizes RandR output names to i3 output names
+# (RandR monitor names) for bar configs
+
+my $bars = i3->get_bar_config()->recv;
+is(@$bars, 1, 'one bar configured');
+
+my $bar_id = shift @$bars;
+
+my $bar_config = i3->get_bar_config($bar_id)->recv;
+is_deeply($bar_config->{outputs}, [ $monitor_name ], 'bar_config output name is normalized');
 
 exit_gracefully($pid);
 
@@ -86,7 +123,7 @@ exit_gracefully($pid);
 
 # When inject_randr15 is defined but false, fake-xinerama will be turned off,
 # but inject_randr15 will not actually be used.
-my $pid = launch_with_config($config, inject_randr15 => '');
+$pid = launch_with_config($config, inject_randr15 => '');
 
 $tree = i3->get_tree->recv;
 @outputs = map { $_->{name} } @{$tree->{nodes}};