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stderr
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/stderr.html
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
stderr
can affect an unrelated file that happened to be assigned to fd 2.
The gnulib *-safer modules may be used to guarantee that fd 2 stays
reserved for stderr
.