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