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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <getopt.h>
#include "bus-log-control-api.h"
#include "bus-object.h"
#include "cgroup-util.h"
#include "conf-parser.h"
#include "daemon-util.h"
#include "log.h"
#include "main-func.h"
#include "oomd-manager.h"
#include "oomd-manager-bus.h"
#include "parse-util.h"
#include "pretty-print.c"
#include "psi-util.h"
#include "signal-util.h"
static bool arg_dry_run = false;
static int arg_swap_used_limit = -1;
static int arg_mem_pressure_limit = -1;
static int parse_config(void) {
static const ConfigTableItem items[] = {
{ "OOM", "SwapUsedLimitPercent", config_parse_percent, 0, &arg_swap_used_limit },
{ "OOM", "DefaultMemoryPressureLimitPercent", config_parse_percent, 0, &arg_mem_pressure_limit },
{}
};
return config_parse_many_nulstr(PKGSYSCONFDIR "/oomd.conf",
CONF_PATHS_NULSTR("systemd/oomd.conf.d"),
"OOM\0",
config_item_table_lookup,
items,
CONFIG_PARSE_WARN,
NULL,
NULL);
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-oomd", "1", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...]\n\n"
"Run the userspace out-of-memory (OOM) killer.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --dry-run Only print destructive actions instead of doing them\n"
" --bus-introspect=PATH Write D-Bus XML introspection data\n"
"\nSee the %s for details.\n"
, program_invocation_short_name
, link
);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_DRY_RUN,
ARG_BUS_INTROSPECT,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "dry-run", no_argument, NULL, ARG_DRY_RUN },
{ "bus-introspect", required_argument, NULL, ARG_BUS_INTROSPECT },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_DRY_RUN:
arg_dry_run = true;
break;
case ARG_BUS_INTROSPECT:
return bus_introspect_implementations(
stdout,
optarg,
BUS_IMPLEMENTATIONS(&manager_object,
&log_control_object));
case '?':
return -EINVAL;
default:
assert_not_reached("Unknown option code.");
}
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program takes no arguments.");
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_(notify_on_cleanup) const char *notify_msg = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
_cleanup_free_ char *swap = NULL;
unsigned long long s = 0;
int r;
log_setup_service();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = parse_config();
if (r < 0)
return r;
/* Do some basic requirement checks for running systemd-oomd. It's not exhaustive as some of the other
* requirements do not have a reliable means to check for in code. */
/* SwapTotal is always available in /proc/meminfo and defaults to 0, even on swap-disabled kernels. */
r = get_proc_field("/proc/meminfo", "SwapTotal", WHITESPACE, &swap);
if (r < 0)
return log_error_errno(r, "Failed to get SwapTotal from /proc/meminfo: %m");
r = safe_atollu(swap, &s);
if (r < 0)
return log_error_errno(r, "Failed to parse SwapTotal from /proc/meminfo: %s: %m", swap);
if (s == 0)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Requires swap to operate");
if (!is_pressure_supported())
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Pressure Stall Information (PSI) is not supported");
r = cg_all_unified();
if (r < 0)
return log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Requires the unified cgroups hierarchy");
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
r = manager_new(&m);
if (r < 0)
return log_error_errno(r, "Failed to create manager: %m");
r = manager_start(m, arg_dry_run, arg_swap_used_limit, arg_mem_pressure_limit);
if (r < 0)
return log_error_errno(r, "Failed to start up daemon: %m");
notify_msg = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
log_info("systemd-oomd starting%s!", arg_dry_run ? " in dry run mode" : "");
r = sd_event_loop(m->event);
if (r < 0)
return log_error_errno(r, "Event loop failed: %m");
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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