/*-*- 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 "log.h" #include "util.h" #include "spawn-ask-password-agent.h" static pid_t agent_pid = 0; int ask_password_agent_open(void) { int r; 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; r = fork_agent(&agent_pid, NULL, 0, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL); if (r < 0) log_error("Failed to fork TTY ask password agent: %s", strerror(-r)); return r; } void ask_password_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; }