10.69.19 execve

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/execve.html

Gnulib module: execve

Portability problems fixed by Gnulib:

Note: The Gnulib replacement for this function is not async-safe, that is, it must not be invoked from a signal handler.

Portability problems not fixed by Gnulib: