9.381 gettimeofday

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/gettimeofday.html

Gnulib module: gettimeofday

Portability problems fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 9.
• This function is declared with a nonstandard function prototype (only one argument, or “...” after the first argument) on some platforms.
• On some platforms, the second argument has type struct timezone* rather than void *, making it an error to redeclare the function with the POSIX signature: glibc. However, rather than penalize these systems with a replacement function, gnulib defines GETTIMEOFDAY_TIMEZONE to the appropriate type for use in avoiding a compiler warning if assigning gettimeofday to a function pointer.
• On some platforms, gettimeofday clobbers the buffer in which localtime returns its result: Mac OS X 10.0.

Portability problems not fixed by Gnulib:

• Behavior is non-portable if the second argument to gettimeofday is not NULL.