t9300: factor out portable "head -c" replacement

diff --git a/credential-cache--daemon.c b/credential-cache--daemon.c
index caef21e4fc91898f209709f723de1df5afc66a66..1f14d56e98834e73dce91f3a20c3e3795ba6fb37 100644 (file)
--- a/credential-cache--daemon.c
+++ b/credential-cache--daemon.c
@@ -126,8 +126,17 @@ static void serve_one_client(FILE *in, FILE *out)
                        fprintf(out, "password=%s\n", e->item.password);
                }
        }
-       else if (!strcmp(action.buf, "exit"))
+       else if (!strcmp(action.buf, "exit")) {
+               /*
+                * It's important that we clean up our socket first, and then
+                * signal the client only once we have finished the cleanup.
+                * Calling exit() directly does this, because we clean up in
+                * our atexit() handler, and then signal the client when our
+                * process actually ends, which closes the socket and gives
+                * them EOF.
+                */
                exit(0);
+       }
        else if (!strcmp(action.buf, "erase"))
                remove_credential(&c);
        else if (!strcmp(action.buf, "store")) {
@@ -170,12 +179,12 @@ static int serve_cache_loop(int fd)
 
                client = accept(fd, NULL, NULL);
                if (client < 0) {
-                       warning("accept failed: %s", strerror(errno));
+                       warning_errno("accept failed");
                        return 1;
                }
                client2 = dup(client);
                if (client2 < 0) {
-                       warning("dup failed: %s", strerror(errno));
+                       warning_errno("dup failed");
                        close(client);
                        return 1;
                }