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10.651 nanosleep

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/nanosleep.html

Gnulib module: nanosleep

Portability problems fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 14.
• This function mishandles large arguments when interrupted by a signal on some platforms: Linux 64-bit, Solaris 64-bit.
• This function cannot sleep longer than 49.7 days on some platforms: Cygwin 1.5.x.
• This function does not fail when passed a negative nanosecond value on some platforms: newer 32-bit mingw.

Portability problems not fixed by Gnulib: