[PATCH] dev.c: fail gracefully on out-of-memory errors

[Eric Wong <e@80x24.org>]

The rest of cmogstored shall be updated to fail gracefully on OOM
in due time.  It may take a while, since not many systems encounter
this, but we shall become more robust as time goes on.
---
 dev.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/dev.c b/dev.c
index cd14db9..5b3888b 100644
--- a/dev.c
+++ b/dev.c
@@ -169,8 +169,17 @@ int mog_dev_mkusage(const struct mog_dev *dev, struct mog_svc *svc)
 	if (!svc->mgmt_mfd)
 		return 0;
 
-	usage_path = xasprintf("/dev%u/usage", (unsigned)dev->devid);
-	tmp_path = xasprintf("%s.%x", usage_path, (unsigned)getpid());
+	if (asprintf(&usage_path, "/dev%u/usage", (unsigned)dev->devid) < 0) {
+		syslog(LOG_ERR, "error generating path: /dev%u/usage (%m)",
+			(unsigned)dev->devid);
+		return 0;
+	}
+	if (asprintf(&tmp_path, "%s.%x", usage_path, (unsigned)getpid()) < 0) {
+		syslog(LOG_ERR, "error generating path: /dev%u/usage.%u (%m)",
+			(unsigned)dev->devid, (unsigned)getpid());
+		free(usage_path);
+		return 0;
+	}
 
 	if (mog_unlink(svc, tmp_path) < 0 && errno != ENOENT) goto out;
 
-- 
EW