Move sway-specific functions in common/util.c into sway/

Modifier handling functions were moved into sway/input/keyboard.c;
opposite_direction for enum wlr_direction into sway/tree/output.c;
and get_parent_pid into sway/tree/root.c .

1 files changed, 35 insertions, 0 deletions

diff --git a/sway/tree/root.c b/sway/tree/root.c
index 08ce7942..d4b97be3 100644
--- a/sway/tree/root.c
+++ b/sway/tree/root.c
@@ -169,6 +169,41 @@ struct pid_workspace {
 
 static struct wl_list pid_workspaces;
 
+/**
+ * Get the pid of a parent process given the pid of a child process.
+ *
+ * Returns the parent pid or NULL if the parent pid cannot be determined.
+ */
+static pid_t get_parent_pid(pid_t child) {
+        pid_t parent = -1;
+        char file_name[100];
+        char *buffer = NULL;
+        char *token = NULL;
+        const char *sep = " ";
+        FILE *stat = NULL;
+        size_t buf_size = 0;
+
+        sprintf(file_name, "/proc/%d/stat", child);
+
+        if ((stat = fopen(file_name, "r"))) {
+                if (getline(&buffer, &buf_size, stat) != -1) {
+                        token = strtok(buffer, sep); // pid
+                        token = strtok(NULL, sep);   // executable name
+                        token = strtok(NULL, sep);   // state
+                        token = strtok(NULL, sep);   // parent pid
+                        parent = strtol(token, NULL, 10);
+                }
+                free(buffer);
+                fclose(stat);
+        }
+
+        if (parent) {
+                return (parent == child) ? -1 : parent;
+        }
+
+        return -1;
+}
+
 struct sway_workspace *root_workspace_for_pid(pid_t pid) {
         if (!pid_workspaces.prev && !pid_workspaces.next) {
                 wl_list_init(&pid_workspaces);