Hi, I have looked further into this issue. Part of the solution would be to reset signal disposition to SIG_DFL, either in the child after the fork, or around the call to create_client in accept connection for the child to inherit appropriate disposition from the start. Temporarily blocking signals could help. I have to verify exactly how it behaves.
By the way, why is SIG_CHLD set to null_handler in create_client? The default disposition for this signal is SIG_IGN. Regards, 2016-02-16 11:45 GMT-05:00 Philippe Anctil <[email protected]>: > Hi, > > In fork mode, sending a sigterm signal to a child is caught by the parent. > I suspect it has something to do with signal_pipe being shared by the child > and parent after the fork. > > Here I sent a signal to the parent while a child process was also running. > The parent shut down as expected. After sending sigterm, the child remains. > > Processes before sigterm: > > UID PID PPID C STIME TTY STAT TIME CMD > user 1423 1 0 10:32 ? Ss 0:00 > /usr/local/stunnel/bin/stunnel.bin /usr/local/stunnel/etc/server.conf > user 1921 1423 0 10:37 ? S 0:00 \_ > /usr/local/stunnel/bin/stunnel.bin /usr/local/stunnel/etc/server.conf > > selected pid 1423 > > Processes after: > > UID PID PPID C STIME TTY STAT TIME CMD > user 1921 1 0 10:37 ? S 0:00 > /usr/local/stunnel/bin/stunnel.bin /usr/local/stunnel/etc/server.conf > > Here I sent the signal to the child. The parent shut down and the child > completed normally. > > Processes before: > > UID PID PPID C STIME TTY STAT TIME CMD > user 1276 1 0 10:31 ? Ss 0:00 > /usr/local/stunnel/bin/stunnel.bin /usr/local/stunnel/etc/server.conf > user 1309 1276 0 10:31 ? S 0:00 \_ > /usr/local/stunnel/bin/stunnel.bin /usr/local/stunnel/etc/server.conf > > selected pid 1309 > > Processes after: > > UID PID PPID C STIME TTY STAT TIME CMD > user 1309 1 0 10:31 ? S 0:00 > /usr/local/stunnel/bin/stunnel.bin /usr/local/stunnel/etc/server.conf > > I know I should be trying threads. I will eventually. I can only switch > once I validate it can sustain our level of traffic. Fork has done that > flawlessly for many years now. > > Best regards, > > > -- > Philippe Anctil > -- Philippe Anctil
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