FreeBSD Manual Pages
io_wantwrite(3) Library Functions Manual io_wantwrite(3) NAME io_wantwrite - signal that you want to write to a descriptor SYNTAX #include <libowfat/io.h> void io_wantwrite(int64 fd); DESCRIPTION io_wantwrite tells the next io_wait() that you want to write to this descriptor. Call io_dontwantwrite() again if you change your mind. The next time you call io_wait(), it will look whether this descriptor becomes writeable, too. You can then use io_canwrite() to check whether the descriptor has become writable. You have to have called io_fd on the descriptor first (io_pipe and io_socketpair do this for you). Waiting on descriptors only works for sockets, fifos and pipes. It may also work on devices and TTYs, but that is platform dependent -- you should not rely on that. SEE ALSO io_wait(3), io_canwrite(3), io_wantwrite(3), io_fd(3) io_wantwrite(3)
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