FreeBSD Manual Pages
io_fd_canwrite(3) Library Functions Manual io_fd_canwrite(3) NAME io_fd_canwrite - prepare descriptor for io_wait SYNTAX #include <libowfat/io.h> int io_fd(int64 fd); int io_fd_canwrite(int64 fd); DESCRIPTION io_fd_canwrite is just like io_fd, except that it assumes the descriptor is writable, which may save a syscall or two. This assumption is true in most cases, because the kernel buffers writes. Noteworthy cases in which you need to use io_fd instead of io_fd_canwrite are unconnected sockets, i.e. when you queued a non-blocking connect() and want to ask for writability to get notified when it went through. It is OK to call this function on a descriptor that io_fd() has already been called on. RETURN VALUE io_fd_canwrite returns 1 on success, 0 on error. SEE ALSO io_wait(3), io_wantread(3), io_canread(3), io_eagain(3), io_nonblock(3), io_fd(3) io_fd_canwrite(3)
NAME | SYNTAX | DESCRIPTION | RETURN VALUE | SEE ALSO
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