pselect
=======

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

Gnulib module: ---

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, mingw, MSVC 14.

  * On some platforms, this function fails to detect invalid fds with EBADF, but only if they lie beyond the current maximum open fd: FreeBSD 8.2.

Portability problems not fixed by Gnulib:

  * This function has a slightly incompatible declaration on some platforms: AIX 7.1 (when _ALL_SOURCE is defined).

  * When the SIGMASK argument is nonnull on platforms that do not natively support this function, race conditions are possible when its gnulib implementation temporarily modifies the signal mask, and the behavior is unspecified in a multi-threaded process.