Add error messages

1 files changed, 9 insertions, 3 deletions

diff --git a/main.c b/main.c
index 3a40e08..4113c98 100644
--- a/main.c
+++ b/main.c
@@ -110,8 +110,10 @@ static int create_local_kms_server_proxy_file(const char *source_path, const cha
 }
 
 int main(int argc, char **argv) {
-    if(argc != 4)
+    if(argc != 4) {
+        fprintf(stderr, "usage: kms-server-proxy <initial_socket_path> <card_path> <user_homepath>\n");
         return 1;
+    }
 
     const char *gsr_kms_server_filepath = "/var/lib/flatpak/app/com.dec05eba.gpu_screen_recorder/current/active/files/bin/gsr-kms-server";
     const char *initial_socket_path = argv[1];
@@ -119,8 +121,10 @@ int main(int argc, char **argv) {
     const char *user_homepath = argv[3];
 
     char self_path[PATH_MAX];
-    if(!readlink_realpath("/proc/self/exe", self_path))
+    if(!readlink_realpath("/proc/self/exe", self_path)) {
+        fprintf(stderr, "failed to resolve /proc/self/exe\n");
         return 1;
+    }
 
     char kms_server_proxy_local_filepath[PATH_MAX];
     /* Update kms-server-proxy-N to kms-server-proxy-N+1 on update (update that needs to run before this program launches itself) */
@@ -132,8 +136,10 @@ int main(int argc, char **argv) {
     } else if(file_has_sys_admin_capability(kms_server_proxy_local_filepath)) {
         /* Need to resolve kms_server_proxy_local_filepath because /home can be a symlink to another location */
         char kms_server_proxy_local_filepath_full[PATH_MAX];
-        if(!readlink_realpath(kms_server_proxy_local_filepath, kms_server_proxy_local_filepath_full))
+        if(!readlink_realpath(kms_server_proxy_local_filepath, kms_server_proxy_local_filepath_full)) {
+            fprintf(stderr, "failed to resolve %s\n", kms_server_proxy_local_filepath);
             return 1;
+        }
 
         /*
             Run cached ~/.local/share/gpu-screen-recorder/kms-server-proxy which has sys admin capability.