document error case
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@ -18,5 +18,8 @@ APIs like FreeBSD's sendfile. The file contents will always be sent in
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a way that allows the operating systems to perform zero copy TCP, and
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the buffers will always be sent using as few syscalls as possible and
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avoiding unnecessary copying (using writev).
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.SH "RETURN VALUE"
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iob_new returns a pointer to an I/O batch data structure. If there was
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a memory allocation error, it returns NULL instead.
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.SH "SEE ALSO"
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iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3), iob_addfile(3)
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