Updated copyright notices to include the year 2018.

lib-storage: Moved connection information in struct mail_user into separate struct mail_user_connection_data.

imap: imap-client-hibernate: Created local variable for mail_user in imap_hibernate_write_cmd().

global: start relying on i_close_fd(-1) being a no-op Cleanup performed with the following semantic patch: @@ expression E; @@ - if (E != -1) - i_close_fd(&E); + i_close_fd(&E);

imap: Add debug logging for [un]hibernation The logs should now clearly say when a client was hibernated and when/why it was was unhibernated.

imap: Don't do autoexpunging when IMAP client is hibernated

Updated copyright notices to include the year 2017.

imap-hibernate: Preserve mail_user.session_create_time through hibernation

imap-hibernate: Properly fix hibernation The previous fix did not properly fix hibernation as the clients still dropped out of hibernate. Also the tag used was no longer following. This change will track tag changes and keeps the hibernation process going on until the user enters something else than DONE\r\ntag IDLE\r\n in same packet.

imap: When hibernating, wait for old imap process to cleanup before creating new ones. This fixes stats errors: stats: Error: FIFO input error: CONNECT: Duplicate session ID Y7Q6E4U7xO1/AAAB for user testuser service imap stats: Warning: Couldn't find session ID: Y7Q6E4U7xO1/AAAB

global: freshen copyright git ls-files | xargs perl -p -i -e 's/(\d+)-201[0-5]/$1-2016/g;s/ (201[0-5]) Dovecot/ $1-2016 Dovecot/'

Fixed compiler warnings in some systems. major() and minor() are unsigned ints nowadays, but in Solaris it's major_t. Cast them explicitly to avoid compiler warnings, and use unsigned longs instead of unsigned ints just in case.

imap-hibernate: Use sockets' st_dev and st_ino to verify that the passed fd is correct.

Changed type of internet port values to in_port_t everywhere. Created special SET_IN_PORT setting type for internet port values. Created net_str2port() for parsing internet port values. Removed several atoi() invocations in the process.

imap: If mailbox state couldn't be exported for hibernation, log also the mailbox name.

imap: Fixed hibernation to work with non-TCP connections. Mainly meaning UNIX socket connections from login processes, which are proxying TLS connections.

Added imap-hibernate process for gathering IDLEing imap processes. imap_hibernate_timeout setting controls how quickly the connection is moved from imap process to imap-hibernate process. Some IMAP extensions like NOTIFY, SEARCH=CONTEXT and COMPRESS aren't supported yet. There's also a new X-STATE command, which can be used to export the current IMAP connection state to a string and later on imported to get back to the original state (a quick resync feature for IMAP clients). However, this command is disabled for now due to the current code being unoptimized for untrusted input.