1 files changed, 51 insertions, 0 deletions
diff --git a/compositor.c b/compositor.c
new file mode 100644
index 0000000..6470611
--- /dev/null
+++ b/compositor.c
@@ -0,0 +1,51 @@
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wayland-client.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+#define PROCESS_NAME_MAX_LENGTH 1024
+
+char name[PROCESS_NAME_MAX_LENGTH] = "";
+
+static pid_t
+pid_from_fd(int fd)
+{
+    struct ucred ucred;
+    socklen_t len = sizeof(struct ucred);
+    if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len) == -1) {
+        perror("getsockopt failed");
+        exit(-1);
+    }
+    return ucred.pid;
+}
+
+static char *
+process_name_from_pid(const pid_t pid) {
+    char proc_buf[64];
+    sprintf(proc_buf, "/proc/%d/comm", pid);
+    FILE *fp;
+    if ((fp = fopen(proc_buf, "r")) == NULL) {
+        fprintf(stderr, "opening '%s' failed: %s\n", proc_buf, strerror(errno));
+        exit(-1);
+    }
+    if (fgets(name, PROCESS_NAME_MAX_LENGTH, fp) == NULL) {
+        fprintf(stderr, "reading '%s' failed\n", proc_buf);
+        exit(-1);
+    }
+    name[strcspn(name, "\n")] = 0;
+    fclose(fp);
+    return name;
+}
+
+char *
+process_name_from_fd(struct wl_display *display)
+{
+    int fd = wl_display_get_fd(display);
+    pid_t pid = pid_from_fd(fd);
+    char *process_name = process_name_from_pid(pid);
+    return process_name;
+}