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055746f501
* m4/gettimeofday.m4 (gl_FUNC_GETTIMEOFDAY): Require AC_CANONICAL_HOST. Set REPLACE_GETTIMEOFDAY to 1 on mingw. * lib/gettimeofday.c (gettimeofday): On native Windows, use the GetSystemTimePreciseAsFileTime based implementation always. * doc/posix-functions/gettimeofday.texi: Mention precision problem on mingw.
41 lines
1.2 KiB
Plaintext
41 lines
1.2 KiB
Plaintext
@node gettimeofday
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@section @code{gettimeofday}
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@findex gettimeofday
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/gettimeofday.html}
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Gnulib module: gettimeofday
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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MSVC 9.
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@item
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This function is declared with a nonstandard function prototype (only one
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argument, or ``...'' after the first argument) on some platforms.
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@item
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On some platforms, the second argument has type @code{struct
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timezone*} rather than @code{void *}, making it an error to redeclare
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the function with the POSIX signature:
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glibc.
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However, rather than penalize these systems with a replacement
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function, gnulib defines @code{GETTIMEOFDAY_TIMEZONE} to the
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appropriate type for use in avoiding a compiler warning if assigning
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@code{gettimeofday} to a function pointer.
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@item
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On some platforms, @code{gettimeofday} clobbers the buffer in which
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@code{localtime} returns its result:
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Mac OS X 10.0.
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@item
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This function has only a precision of 15.6 milliseconds on some platforms:
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mingw.
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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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Behavior is non-portable if the second argument to @code{gettimeofday}
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is not @code{NULL}.
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@end itemize
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