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putc_unlocked
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/putc_unlocked.html
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
errno
or the
stream error indicator on attempts to write to a read-only stream:
Cygwin 1.7.9.