From 9b2c161481573cea6d0f478576b7b854d76ebe02 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 14 Feb 2023 16:37:05 +0100 Subject: shared: add a common SIGRTMIN-18 handler --- src/shared/common-signal.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 src/shared/common-signal.c (limited to 'src/shared/common-signal.c') diff --git a/src/shared/common-signal.c b/src/shared/common-signal.c new file mode 100644 index 0000000000..1896443632 --- /dev/null +++ b/src/shared/common-signal.c @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "common-signal.h" +#include "fd-util.h" +#include "fileio.h" +#include "process-util.h" +#include "signal-util.h" + +int sigrtmin18_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { + struct sigrtmin18_info *info = userdata; + _cleanup_free_ char *comm = NULL; + int r; + + assert(s); + assert(si); + + (void) get_process_comm(si->ssi_pid, &comm); + + if (si->ssi_code != SI_QUEUE) { + log_notice("Received control signal %s from process " PID_FMT " (%s) without command value, ignoring.", + signal_to_string(si->ssi_signo), + (pid_t) si->ssi_pid, + strna(comm)); + return 0; + } + + log_debug("Received control signal %s from process " PID_FMT " (%s) with command 0x%08x.", + signal_to_string(si->ssi_signo), + (pid_t) si->ssi_pid, + strna(comm), + (unsigned) si->ssi_int); + + switch (si->ssi_int) { + + case _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE..._COMMON_SIGNAL_COMMAND_LOG_LEVEL_END: + log_set_max_level(si->ssi_int - _COMMON_SIGNAL_COMMAND_LOG_LEVEL_BASE); + break; + + case COMMON_SIGNAL_COMMAND_CONSOLE: + log_set_target_and_open(LOG_TARGET_CONSOLE); + break; + case COMMON_SIGNAL_COMMAND_JOURNAL: + log_set_target_and_open(LOG_TARGET_JOURNAL); + break; + case COMMON_SIGNAL_COMMAND_KMSG: + log_set_target_and_open(LOG_TARGET_KMSG); + break; + case COMMON_SIGNAL_COMMAND_NULL: + log_set_target_and_open(LOG_TARGET_NULL); + break; + + case COMMON_SIGNAL_COMMAND_MEMORY_PRESSURE: + if (info && info->memory_pressure_handler) + return info->memory_pressure_handler(s, info->memory_pressure_userdata); + + sd_event_trim_memory(); + break; + + case COMMON_SIGNAL_COMMAND_MALLOC_INFO: { + _cleanup_free_ char *data = NULL; + _cleanup_fclose_ FILE *f = NULL; + size_t sz; + + f = open_memstream_unlocked(&data, &sz); + if (!f) { + log_oom(); + break; + } + + if (malloc_info(0, f) < 0) { + log_error_errno(errno, "Failed to invoke malloc_info(): %m"); + break; + } + + fputc(0, f); + + r = fflush_and_check(f); + if (r < 0) { + log_error_errno(r, "Failed to flush malloc_info() buffer: %m"); + break; + } + + log_dump(LOG_INFO, data); + break; + } + + default: + log_notice("Received control signal %s with unknown command 0x%08x, ignoring.", + signal_to_string(si->ssi_signo), (unsigned) si->ssi_int); + break; + } + + return 0; +} -- cgit v1.2.3