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();
/* 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. */
- if (access("/proc/swaps", F_OK) < 0)
- return log_error_errno(errno, "Swap not enabled: %m");
+
+ /* 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");