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net/imap: set SO_KEEPALIVE on TCP sockets

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Otherwise connections (commonly on IDLE, but it could be any
command) may never receive notifications of link errors.

[ruby-core:86628] [Feature #14703]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63243 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-04-22 21:21:06 +00:00
parent 75e5a91e92
commit c4056a4a70
1 changed files with 3 additions and 1 deletions
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4
lib/net/imap.rb
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@ -1129,7 +1129,9 @@ module Net
end
def tcp_socket(host, port)
Socket.tcp(host, port, :connect_timeout => @open_timeout)
s = Socket.tcp(host, port, :connect_timeout => @open_timeout)
s.setsockopt(:SOL_SOCKET, :SO_KEEPALIVE, true)
s
rescue Errno::ETIMEDOUT
raise Net::OpenTimeout, "Timeout to open TCP connection to " +
"#{host}:#{port} (exceeds #{@open_timeout} seconds)"