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setvbuf
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/setvbuf.html
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
errno
upon failure.
_IOLBF
(line-buffering)
is treated as if it were _IOFBF
(full buffering),
possibly with a warning generated.