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The rasdaemon service may fail to be started for the first time. #168

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The rasdaemon service may fail to be started for the first time. #168

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19 changes: 19 additions & 0 deletions ras-events.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,19 @@ static int get_debugfs_dir(char *tracing_dir, size_t len)
return -ENOENT;
}

static int wait_access(char *path, int ms)
{
int i;
for (i = 0; i < ms; i++) {
if (access(path, F_OK) == 0)
return 0;
usleep(1000);
}

log(ALL, LOG_WARNING, "wait_access() failed, %s not created in %d ms\n", path, ms);
return -1;
}

static int open_trace(struct ras_events *ras, char *name, int flags)
{
char fname[MAX_PATH + 1];
Expand All @@ -113,6 +126,12 @@ static int open_trace(struct ras_events *ras, char *name, int flags)
if (rc < 0)
return rc;

rc = wait_access(fname, 30000);
if (rc != 0) {
/* use -1 to keep same error value with open() */
return -1;
}

rc = open(fname, flags);
if (rc < 0) {
rc = -errno;
Expand Down