move more common files to shared/ and add them to shared.la

[elogind.git] / src / shared / spawn-polkit-agent.c

diff --git a/src/shared/spawn-polkit-agent.c b/src/shared/spawn-polkit-agent.c
new file mode 100644 (file)
index 0000000..fd72588
--- /dev/null
+++ b/src/shared/spawn-polkit-agent.c
@@ -0,0 +1,86 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/poll.h>
+
+#include "log.h"
+#include "util.h"
+#include "spawn-polkit-agent.h"
+
+static pid_t agent_pid = 0;
+
+int polkit_agent_open(void) {
+        int r;
+        int pipe_fd[2];
+        char notify_fd[10 + 1];
+
+        if (agent_pid > 0)
+                return 0;
+
+        /* We check STDIN here, not STDOUT, since this is about input,
+         * not output */
+        if (!isatty(STDIN_FILENO))
+                return 0;
+
+        if (pipe2(pipe_fd, 0) < 0)
+                return -errno;
+
+        snprintf(notify_fd, sizeof(notify_fd), "%i", pipe_fd[1]);
+        char_array_0(notify_fd);
+
+        r = fork_agent(&agent_pid,
+                       &pipe_fd[1], 1,
+                       POLKIT_AGENT_BINARY_PATH,
+                       POLKIT_AGENT_BINARY_PATH, "--notify-fd", notify_fd, NULL);
+
+        /* Close the writing side, because that's the one for the agent */
+        close_nointr_nofail(pipe_fd[1]);
+
+        if (r < 0)
+                log_error("Failed to fork TTY ask password agent: %s", strerror(-r));
+        else
+                /* Wait until the agent closes the fd */
+                fd_wait_for_event(pipe_fd[0], POLLHUP, (usec_t) -1);
+
+        close_nointr_nofail(pipe_fd[0]);
+
+        return r;
+}
+
+void polkit_agent_close(void) {
+
+        if (agent_pid <= 0)
+                return;
+
+        /* Inform agent that we are done */
+        kill(agent_pid, SIGTERM);
+        kill(agent_pid, SIGCONT);
+        wait_for_terminate(agent_pid, NULL);
+        agent_pid = 0;
+}