diff options
Diffstat (limited to 'src/spawn-agent.c')
-rw-r--r-- | src/spawn-agent.c | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/src/spawn-agent.c b/src/spawn-agent.c deleted file mode 100644 index 2de2530885..0000000000 --- a/src/spawn-agent.c +++ /dev/null @@ -1,120 +0,0 @@ -/*-*- 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 General Public License as published by - the Free Software Foundation; either version 2 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 - General Public License for more details. - - You should have received a copy of the GNU 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-agent.h" - -static pid_t agent_pid = 0; - -void agent_open(void) { - pid_t parent_pid; - - if (agent_pid > 0) - return; - - /* We check STDIN here, not STDOUT, since this is about input, - * not output */ - if (!isatty(STDIN_FILENO)) - return; - - parent_pid = getpid(); - - /* Spawns a temporary TTY agent, making sure it goes away when - * we go away */ - - agent_pid = fork(); - if (agent_pid < 0) { - log_error("Failed to fork agent: %m"); - return; - } - - if (agent_pid == 0) { - /* In the child */ - - int fd; - bool stdout_is_tty, stderr_is_tty; - - /* Make sure the agent goes away when the parent dies */ - if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) - _exit(EXIT_FAILURE); - - /* Check whether our parent died before we were able - * to set the death signal */ - if (getppid() != parent_pid) - _exit(EXIT_SUCCESS); - - /* Don't leak fds to the agent */ - close_all_fds(NULL, 0); - - stdout_is_tty = isatty(STDOUT_FILENO); - stderr_is_tty = isatty(STDERR_FILENO); - - if (!stdout_is_tty || !stderr_is_tty) { - /* Detach from stdout/stderr. and reopen - * /dev/tty for them. This is important to - * ensure that when systemctl is started via - * popen() or a similar call that expects to - * read EOF we actually do generate EOF and - * not delay this indefinitely by because we - * keep an unused copy of stdin around. */ - fd = open("/dev/tty", O_WRONLY); - if (fd < 0) { - log_error("Failed to open /dev/tty: %m"); - _exit(EXIT_FAILURE); - } - - if (!stdout_is_tty) - dup2(fd, STDOUT_FILENO); - - if (!stderr_is_tty) - dup2(fd, STDERR_FILENO); - - if (fd > 2) - close(fd); - } - - execl(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL); - - log_error("Unable to execute agent: %m"); - _exit(EXIT_FAILURE); - } -} - -void 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; -} |