From 13790add4bf648fed816361794d8277a75253410 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 6 Jan 2015 00:30:25 +0100 Subject: journald: allow restarting journald without losing stream connections Making use of the fd storage capability of the previous commit, allow restarting journald by serilizing stream state to /run, and pushing open fds to PID 1. --- src/journal/journald-server.c | 30 +++++++++++++++++++++--------- 1 file changed, 21 insertions(+), 9 deletions(-) (limited to 'src/journal/journald-server.c') diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c index 4613550039..e0a078ee33 100644 --- a/src/journal/journald-server.c +++ b/src/journal/journald-server.c @@ -1182,6 +1182,10 @@ int server_process_datagram(sd_event_source *es, int fd, uint32_t revents, void log_error_errno(errno, "recvmsg() failed: %m"); return -errno; } + if (n == 0) { + log_error("Got EOF on socket."); + return -ECONNRESET; + } for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { @@ -1462,6 +1466,7 @@ static int server_open_hostname(Server *s) { } int server_init(Server *s) { + _cleanup_fdset_free_ FDSet *fds = NULL; int n, r, fd; assert(s); @@ -1558,26 +1563,33 @@ int server_init(Server *s) { s->audit_fd = fd; } else { - log_warning("Unknown socket passed as file descriptor %d, ignoring.", fd); - /* Let's close the fd, better be safe than - sorry. The fd might reference some resource - that we really want to release if we don't - make use of it. */ + if (!fds) { + fds = fdset_new(); + if (!fds) + return log_oom(); + } - safe_close(fd); + r = fdset_put(fds, fd); + if (r < 0) + return log_oom(); } } - r = server_open_syslog_socket(s); + r = server_open_stdout_socket(s, fds); if (r < 0) return r; - r = server_open_native_socket(s); + if (fdset_size(fds) > 0) { + log_warning("%u unknown file descriptors passed, closing.", fdset_size(fds)); + fds = fdset_free(fds); + } + + r = server_open_syslog_socket(s); if (r < 0) return r; - r = server_open_stdout_socket(s); + r = server_open_native_socket(s); if (r < 0) return r; -- cgit v1.2.3-54-g00ecf