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http://bugs.exim.org/show_bug.cgi?id=1007
Summary: tod_stamp uses non-reentrant localtime()
Product: Exim
Version: 4.71
Platform: All
OS/Version: All
Status: NEW
Severity: bug
Priority: medium
Component: General execution
AssignedTo: pdp@???
ReportedBy: pdp@???
CC: exim-dev@???
exiwhat(1) uses SIGUSR1 which traps into exim.c:usr1_handler() which uses
log_write which uses tod_stamp which uses the non-reentrant
gmtime()/localtime().
localtime() can then deadlock on waiting for a tz lock.
Work-around: *probably* sufficient to set: timezone = UTC
Need to make tod_stamp() use the *_r() variants if available. localtime_r() is
optional in SUSv3, is present in SUSv2 which notes that it's derived from the
POSIX Threads Extension, 1003.1c-1995. I suspect that it's best to switch to
the _r variants but provide a compile-time knob, which some OSes can set, to
stub out localtime_r() to just unsafely call localtime(). People who complain
should use OSes that provide the *_r() variants.
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