Daan De Meyer
f102bc3e5f
Let's not leak details from src/shared and src/libsystemd into src/basic, even though you can't actually do anything useful with just forward declarations from src/shared. The sd-forward.h header is put in src/libsystemd/sd-common as we don't have a directory for shared internal headers for libsystemd yet. Let's also rename forward.h to basic-forward.h to keep things self-explanatory.
64 lines
2.6 KiB
C
64 lines
2.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <syslog.h>
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#include "shared-forward.h"
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/* All our long-running services should implement a SIGRTMIN+18 handler that can be used to trigger certain
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* actions that affect service runtime. The specific action is indicated via the "value integer" you can pass
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* along realtime signals. This is mostly intended for debugging purposes and is entirely asynchronous in
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* nature. Specifically, these are the commands:
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*
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* Currently available operations:
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*
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* • Change maximum log level
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* • Change log target
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* • Invoke memory trimming, like under memory pressure
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* • Write glibc malloc() allocation info to logs
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*
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* How to use this? Via a command like the following:
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*
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* /usr/bin/kill -s RTMIN+18 -q 768 1
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*
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* (This will tell PID 1 to trim its memory use.)
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*
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* or:
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*
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* systemctl kill --kill-value=0x300 -s RTMIN+18 systemd-journald
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*
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* (This will tell journald to trim its memory use.)
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*/
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enum {
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_COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE = 0x100,
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COMMON_SIGNAL_COMMAND_LOG_EMERG = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_EMERG,
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COMMON_SIGNAL_COMMAND_LOG_ALERT = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_ALERT,
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COMMON_SIGNAL_COMMAND_LOG_CRIT = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_CRIT,
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COMMON_SIGNAL_COMMAND_LOG_ERR = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_ERR,
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COMMON_SIGNAL_COMMAND_LOG_WARNING = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_WARNING,
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COMMON_SIGNAL_COMMAND_LOG_NOTICE = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_NOTICE,
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COMMON_SIGNAL_COMMAND_LOG_INFO = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_INFO,
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COMMON_SIGNAL_COMMAND_LOG_DEBUG = _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE + LOG_DEBUG,
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_COMMON_SIGNAL_COMMAND_LOG_LEVEL_END = COMMON_SIGNAL_COMMAND_LOG_DEBUG,
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COMMON_SIGNAL_COMMAND_CONSOLE = 0x200,
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COMMON_SIGNAL_COMMAND_JOURNAL,
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COMMON_SIGNAL_COMMAND_KMSG,
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COMMON_SIGNAL_COMMAND_NULL,
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COMMON_SIGNAL_COMMAND_MEMORY_PRESSURE = 0x300,
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COMMON_SIGNAL_COMMAND_MALLOC_INFO,
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/* Private signals start at 0x500 */
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_COMMON_SIGNAL_COMMAND_PRIVATE_BASE = 0x500,
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_COMMON_SIGNAL_COMMAND_PRIVATE_END = 0xfff,
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};
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struct sigrtmin18_info {
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sd_event_handler_t memory_pressure_handler;
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void *memory_pressure_userdata;
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};
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int sigrtmin18_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata);
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