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147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef INIT_H
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#define INIT_H
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#include <linux/reboot.h>
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#include <sys/signalfd.h>
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#include <sys/reboot.h>
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#include <signal.h>
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#include "service.h"
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#include "telinit.h"
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#include "util.h"
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#define ENVFILE ETCPATH "/initd.env"
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enum {
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STATUS_OK = 0,
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STATUS_FAIL,
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STATUS_WAIT,
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STATUS_STARTED,
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};
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/********** runlst.c **********/
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/*
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Plow through an array of strings and execute each one, i.e. do
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a fork() and exec().
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In the parent process, wait() until the child is done before
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continuing through the list.
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If ctty is not NULL, open it and redirect all I/O of the child
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process to that file.
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If everyhing works, the function returns EXIT_SUCCESS. If one child
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does not exit with EXIT_SUCCESS, processing of the list is aborted
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and the function returns the exit status of the failed process.
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*/
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int runlst_wait(exec_t *list, const char *ctty);
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/*
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Does basically the same as runlst_wait, but asynchronously.
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A child process is created that calls runlst_wait exits with the
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result of runlst_wait. In the parent process, the function returns
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immediately with the PID of the child process.
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Alternatively, if num is 1, the child process directly exec()s the
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given command.
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*/
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pid_t runlst(exec_t *list, const char *ctty);
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/********** status.c **********/
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/*
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Print a status message. Type is either STATUS_OK, STATUS_FAIL,
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STATUS_WAIT or STATUS_STARTED.
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A new-line is appended to the mssage, UNLESS type is STATUS_WAIT.
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If update is true, print a carriage return first to overwrite the
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current line (e.g. after a STATUS_WAIT message).
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*/
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void print_status(const char *msg, int type, bool update);
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/********** mksock.c **********/
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/*
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Create a UNIX socket that programs can use to pass messages to init.
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Returns the socked fd or -1 on failure. The function takes care of
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printing error messages on failure.
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The socket has the CLOEXEC flag set.
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*/
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int mksock(void);
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/********** svclist.c **********/
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/*
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Returns true if the list of running services contains
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single shot processes.
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*/
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bool svclist_have_singleshot(void);
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/* Add a service to the list of running services */
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void svclist_add(service_t *svc);
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/*
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Remove a service, identifierd by PID, from the list of
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running services.
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Returns the service identified by the PID or NULL if there
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is no such service.
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*/
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service_t *svclist_remove(pid_t pid);
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/********** env.c **********/
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/*
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Read /etc/initd.env (actually ENVFILE defined above)
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and setup environment variables for init.
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*/
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int initenv(void);
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/********** signal_<platform>.c **********/
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/*
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Setup signal handling. Returns -1 on error, a file descriptor on
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success.
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The returned file descriptor can be polled and becomes readable
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when a signal arrives. Reading from it returns a signalfd_siginfo
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structure.
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The returned file descriptor has the close on exec flag set.
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The kernel is also told to send us SIGINT signals if a user presses
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the local equivalent of CTRL+ALT+DEL.
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*/
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int sigsetup(void);
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/*
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Undo everything that sigsetup() changed about signal handling and
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restore the default.
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*/
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void sigreset(void);
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#endif /* INIT_H */
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