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authorLennart Poettering <lennart@poettering.net>2015-08-03 17:29:09 +0200
committerLennart Poettering <lennart@poettering.net>2015-08-03 17:34:49 +0200
commit38a03f06a7393d2721c23f23f0589d2f6d0904af (patch)
tree18f293ee4b9269aa085120920e2f36ea4a4fe99b /src/resolve
parent4d2bee0620c04f935f7de0cc10d8d5e5d3e54b6a (diff)
sd-event: make sure sd_event_now() cannot fail
Previously, if the event loop never ran before sd_event_now() would fail. With this change it will instead fall back to invoking now(). This way, the function cannot fail anymore, except for programming error when invoking it with wrong parameters. This takes into account the fact that many callers did not handle the error condition correctly, and if the callers did, then they kept simply invoking now() as fall back on their own. Hence let's shorten the code using this call, and make things more robust, and let's just fall back to now() internally. Whether now() is used or the cache timestamp may still be detected via the return value of sd_event_now(). If > 0 is returned, then the fall back to now() was used, if == 0 is returned, then the cached value was returned. This patch also simplifies many of the invocations of sd_event_now(): the manual fall back to now() can be removed. Also, in cases where the call is invoked withing void functions we can now protect the invocation via assert_se(), acknowledging the fact that the call cannot fail anymore except for programming errors with the parameters. This change is inspired by #841.
Diffstat (limited to 'src/resolve')
-rw-r--r--src/resolve/resolved-dns-transaction.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index 487b2c5162..53779f3372 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -372,9 +372,7 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
}
}
- r = sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts);
- if (r < 0)
- ts = now(clock_boottime_or_monotonic());
+ assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0);
switch (t->scope->protocol) {
case DNS_PROTOCOL_DNS:
@@ -602,9 +600,7 @@ int dns_transaction_go(DnsTransaction *t) {
return 0;
}
- r = sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts);
- if (r < 0)
- ts = now(clock_boottime_or_monotonic());
+ assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0);
t->n_attempts++;
t->start_usec = ts;