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10.721 popen

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

Gnulib module: popen

Portability problems fixed by Gnulib:

• This function is missing on some platforms: MSVC 14.
• Some platforms start the child with closed stdin or stdout if the standard descriptors were closed in the parent: Cygwin 1.5.x.

Portability problems not fixed by Gnulib:

• On native Windows platforms, this functions terminates the current process with exit code 127 if the environment variable COMSPEC is not set.
• Some platforms mistakenly set the close-on-exec bit, then if it is cleared by the application, the platform then leaks file descriptors from earlier popen calls into subsequent popen children: Cygwin 1.5.x.