process.h 1.51 KB
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/*  Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
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/*!
 * \brief Functions for POSIX process handling.
 */

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#pragma once
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#include <stdbool.h>
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#include <unistd.h>

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/*!
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 * \brief Check if PID file exists and create it if possible.
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 *
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 * \retval NULL if failed.
 * \retval Created PID file path.
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 */
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char *pid_check_and_create(void);
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/*!
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 * \brief Remove PID file.
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 *
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 * \warning PID file content won't be checked.
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 */
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void pid_cleanup(void);
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/*!
 * \brief Return true if the PID is running.
 *
 * \param pid Process ID.
 *
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 * \retval 1 if running.
 * \retval 0 if not running (or error).
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 */
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bool pid_running(pid_t pid);
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/*!
 * \brief Update process privileges to new UID/GID.
 *
 * \param uid New user ID.
 * \param gid New group ID.
 *
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 * \retval KNOT_EOK on success.
 * \retval KNOT_EACCESS if storage is not writeable.
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 */
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int proc_update_privileges(int uid, int gid);