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32 lines
1.4 KiB
Groff
32 lines
1.4 KiB
Groff
9 months ago
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.TH iob_new_autofree 3
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.SH NAME
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iob_new_autofree \- create new I/O batch with autofree flag set
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.SH SYNTAX
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.B #include <libowfat/iob.h>
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io_batch* \fBiob_new_autofree\fP(size_t hint_entries);
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.SH DESCRIPTION
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iob_new_autofree creates a new I/O batch with enough space allocated for
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\fIhint_entries\fR entries (buffers or files). This is purely a
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performance hint. If you are unsure just pass 1.
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The autofree flag will be set, which means resources will be freed in
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\fIiob_send\fR once they have been sent out, not only once you call \fIiob_reset\fR
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or \fIiob_free\fR at the end. You still have to call those as autofree only
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frees resources to be sent in the batch, not the resources of the batch
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itself.
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You can add buffers, strings and files to an I/O batch and then send it
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all at once using iob_send.
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The benefit of the I/O batch API is that it exploits platform specific
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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_autofree returns a pointer to an I/O batch data structure. If
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there was a memory allocation error, it returns NULL instead.
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.SH "SEE ALSO"
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iob_new(3), iob_init(3), iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3), iob_addfile(3)
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