I wrote:
>> strace'ing syslogd on my HPUX box shows that it doesn't issue explicit
>> fsync calls either, but I don't know of any way to tell whether it's got
>> the log files opened O_SYNC.

It occurred to me to SIGHUP syslogd and watch it reopen its log files
with strace.  No O_SYNC.

So it seems fairly likely that the fsync-by-default business is indeed
a Linux-ism not shared by other Unixen.

                        regards, tom lane

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