__fsetlocking
extern int __fsetlocking(FILE *stream, int type);
if (__fsetlocking(&siop, FSETLOCKING_BYCALLER) == -1)
if (__fsetlocking(&siop, FSETLOCKING_BYCALLER) == -1)
if (__fsetlocking(&siop, FSETLOCKING_BYCALLER) == -1)
if (__fsetlocking(&strbuf, FSETLOCKING_BYCALLER) == -1) {