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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/types.h> | |
23 | #include <stdlib.h> | |
24 | #include <unistd.h> | |
25 | #include <string.h> | |
26 | #include <sys/prctl.h> | |
27 | #include <signal.h> | |
28 | #include <fcntl.h> | |
29 | ||
30 | #include "log.h" | |
31 | #include "util.h" | |
32 | #include "spawn-ask-password-agent.h" | |
33 | ||
34 | static pid_t agent_pid = 0; | |
35 | ||
36 | int ask_password_agent_open(void) { | |
37 | int r; | |
38 | ||
39 | if (agent_pid > 0) | |
40 | return 0; | |
41 | ||
42 | /* We check STDIN here, not STDOUT, since this is about input, | |
43 | * not output */ | |
44 | if (!isatty(STDIN_FILENO)) | |
45 | return 0; | |
46 | ||
47 | r = fork_agent(&agent_pid, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL); | |
48 | if (r < 0) | |
49 | log_error("Failed to fork TTY ask password agent: %s", strerror(-r)); | |
50 | ||
51 | return r; | |
52 | } | |
53 | ||
54 | void ask_password_agent_close(void) { | |
55 | ||
56 | if (agent_pid <= 0) | |
57 | return; | |
58 | ||
59 | /* Inform agent that we are done */ | |
60 | kill(agent_pid, SIGTERM); | |
61 | kill(agent_pid, SIGCONT); | |
62 | wait_for_terminate(agent_pid, NULL); | |
63 | agent_pid = 0; | |
64 | } |