80 lines
2.7 KiB
Diff
80 lines
2.7 KiB
Diff
From 1316ec49f209e31799d42d114bd7f35d5acbe097 Mon Sep 17 00:00:00 2001
|
|
From: Lennart Poettering <lennart@poettering.net>
|
|
Date: Tue, 22 Nov 2022 12:28:19 +0100
|
|
Subject: [PATCH] resolved: handle -EINTR returned from fd_wait_for_event()
|
|
better
|
|
|
|
We might get signals for various reasons (for example, somebody asking
|
|
us to reload caches via a signal), hence let's handle this gracefully.
|
|
|
|
(cherry picked from commit 6d66a221685c15798e796d9738f73fdb1fdccdb2)
|
|
|
|
Related: #2172846
|
|
---
|
|
src/resolve/resolved-manager.c | 20 ++++++++++++++++----
|
|
1 file changed, 16 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
|
|
index 2a23c387a6..5583d63527 100644
|
|
--- a/src/resolve/resolved-manager.c
|
|
+++ b/src/resolve/resolved-manager.c
|
|
@@ -842,11 +842,14 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
|
|
}
|
|
|
|
static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
|
|
+ usec_t end;
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(mh);
|
|
|
|
+ end = usec_add(now(CLOCK_MONOTONIC), SEND_TIMEOUT_USEC);
|
|
+
|
|
for (;;) {
|
|
if (sendmsg(fd, mh, flags) >= 0)
|
|
return 0;
|
|
@@ -857,20 +860,26 @@ static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
|
|
if (errno != EAGAIN)
|
|
return -errno;
|
|
|
|
- r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
|
|
- if (r < 0)
|
|
+ r = fd_wait_for_event(fd, POLLOUT, LESS_BY(end, now(CLOCK_MONOTONIC)));
|
|
+ if (r < 0) {
|
|
+ if (ERRNO_IS_TRANSIENT(r))
|
|
+ continue;
|
|
return r;
|
|
+ }
|
|
if (r == 0)
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
static int write_loop(int fd, void *message, size_t length) {
|
|
+ usec_t end;
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(message);
|
|
|
|
+ end = usec_add(now(CLOCK_MONOTONIC), SEND_TIMEOUT_USEC);
|
|
+
|
|
for (;;) {
|
|
if (write(fd, message, length) >= 0)
|
|
return 0;
|
|
@@ -881,9 +890,12 @@ static int write_loop(int fd, void *message, size_t length) {
|
|
if (errno != EAGAIN)
|
|
return -errno;
|
|
|
|
- r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
|
|
- if (r < 0)
|
|
+ r = fd_wait_for_event(fd, POLLOUT, LESS_BY(end, now(CLOCK_MONOTONIC)));
|
|
+ if (r < 0) {
|
|
+ if (ERRNO_IS_TRANSIENT(r))
|
|
+ continue;
|
|
return r;
|
|
+ }
|
|
if (r == 0)
|
|
return -ETIMEDOUT;
|
|
}
|