1iob_send(3) Library Functions Manual iob_send(3)
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6 iob_send - send I/O batch
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9 #include <iob.h>
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11 int64 iob_send(int64 s,io_batch* b);
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14 iob_send sends the (rest of) b over the socket s.
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16 iob_send returns the number of bytes written, 0 if there were no more
17 bytes to be written in the batch, -1 for EAGAIN, or -3 for a permanent
18 error (for example "connection reset by peer").
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20 The normal usage pattern is using io_wait to know when a descriptor is
21 writable, and then calling iob_send until it returns 0, -1 or -3.
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23 If it returns 0, terminate the loop (everything was written OK). If it
24 returns -1, call io_wait again. If it returned -3, signal an error and
25 close the socket.
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27 The benefit of the I/O batch API is that it exploits platform specific
28 APIs like FreeBSD's sendfile. The file contents will always be sent in
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30 the buffers will always be sent using as few syscalls as possible and
31 avoiding unnecessary copying (using writev).
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34 iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3),
35 iob_addfile(3), iob_prefetch(3)
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39 iob_send(3)