fdatasync        1006 lib/unistd.in.h _GL_FUNCDECL_SYS (fdatasync, int, (int fd));
fdatasync        1008 lib/unistd.in.h _GL_CXXALIAS_SYS (fdatasync, int, (int fd));
fdatasync        1009 lib/unistd.in.h _GL_CXXALIASWARN (fdatasync);
fdatasync        1013 lib/unistd.in.h _GL_WARN_ON_USE (fdatasync, "fdatasync is unportable - "