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* doc/posix-functions/ctime.texi, doc/posix-functions/daylight.texi: * doc/posix-functions/localtime.texi, doc/posix-functions/mktime.texi: * doc/posix-functions/strftime.texi, doc/posix-functions/timezone.texi: * doc/posix-functions/tzname.texi, doc/posix-functions/tzset.texi: * doc/posix-functions/wcsftime.texi: Mention some issues with TZ under MS-Windows.
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
@node ctime
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@section @code{ctime}
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@findex ctime
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ctime.html}
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Gnulib module: ctime
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Portability problems fixed by Gnulib:
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@itemize
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@item
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On native Windows platforms (mingw, MSVC), this function works incorrectly
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when the environment variable @code{TZ} has been set by Cygwin.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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This function may overflow its internal buffer if an invalid year is passed.
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@item
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The @code{ctime} function need not be reentrant, and consequently is
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not required to be thread safe. Implementations of @code{ctime}
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typically write the timestamp into static buffer. If two threads
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call @code{ctime} at roughly the same time, you might end up with the
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wrong date in one of the threads, or some undefined string. There is
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a re-entrant interface @code{ctime_r}.
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@item
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Native Windows platforms (mingw, MSVC) support only a subset of time
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zones supported by GNU or specified by POSIX. @xref{tzset}.
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@end itemize
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A more flexible function is @code{strftime}. However, note that it is
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locale dependent.
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