On 08/09/2018 10:33 AM, Kyotaro HORIGUCHI wrote:

- Since I'm not sure unlink is signal-handler safe on all
   supported platforms, I moved unlink() call out of
   checkLogrotateSignal() to SysLoggerMain, just before rotating
   log file.

Which platforms specifically do you have in mind? unlink() is required to be async-signal-safe by POSIX.1-2001, which is required by UNIX 03, and these are rather old. For UNIX 03-certified distributions, see this list: http://www.opengroup.org/csq/search/t=XY1.html For FreeBSD, unlink() was signal-safe at least in 4.0, which was released in 2000 https://www.freebsd.org/cgi/man.cgi?query=sigaction&apropos=0&sektion=0&manpath=FreeBSD+4.0-RELEASE&arch=default&format=html Debian 4.0, which was released in 2007 and had a 2.6 kernel, also claims to have a signal-safe unlink(): https://www.freebsd.org/cgi/man.cgi?query=signal&apropos=0&sektion=0&manpath=Debian+4.0.9&arch=default&format=html

Alexander Kuzmenkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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