[manpages] Added sxstream_open, sxstream_openwch, sxstream_close;
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sxstream_open.3
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.TH SXSTREAM_OPEN 3 "28 March 2016" "SXMP" "SXMP Library Manual"
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.SH NAME
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sxstream_open \- Open a stream on the pointed sxlink.
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.br
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sxstream_openwch \- Open a stream on the pointed sxlink using already opened channel.
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.br
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sxstream_close \- Close stream and free all associated buffers.
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.SH SYNOPSIS
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.B #include <sxmp/sxmp.h>
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.sp
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sxstream_t *sxstream_open(sxlink_t *link, const char *opt, int stid,
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int flags);
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sxstream_t *sxstream_openwch(sxlink_t *link, sxchnl_t *channel,
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const char *opt, int stid,
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int flags);
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int sxstream_close(sxstream_t *stream);
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.br
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.sp
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.SH DESCRIPTION
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.B sxstream_open
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will open a stream on the pointed by
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.B link
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sxlink with optional parameter
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.B opt.
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Stream with
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.B stid
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type will be opened with applied
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.B flags.
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.br
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Flags is ored the following ones:
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.br
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.B SXE_O_BINARY
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- Opening stream desired to be binary (not to use with
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.B SXE_O_NAMED
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)
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.br
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.B SXE_O_READ
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- Opening stream has read access
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.br
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.B SXE_O_WRITE
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- Opening stream has write access
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.br
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.B SXE_O_ASYNC
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- Currently not implemented
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.br
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.B SXE_O_TRUNC
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- Stream will be truncated to zero (might be used with SXE_O_WRITE only)
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.br
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.B SXE_O_NAMED
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- Opening stream desired to be a named list data (not to use with SXE_O_BINARY)
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.br
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.B sxstream_openwch
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will do the same, but will use already opened channel pointed by
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.B channel.
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.br
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.B sxstream_close
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will close a
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.B stream
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and destroy all buffers dedicated for the stream.
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.br
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Please note: stream functions are not thread safe you need to care about using it in multithreaded
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applications.
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.br
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.SH RETURN VALUE
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Upon successful completion, the functions
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.B sxstream_open
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and
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.B sxstream_openwch
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will return a valid pointer to the newly created stream. Otherwise NULL will be returned and
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.B errno will be set with appropriate error.
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.B sxstream_close
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will return
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.B SXE_SUCCESS
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on successful case, otherwise it will return an error described below.
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.SH ERRORS
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.B SXE_FAILED
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will be returned in case of bad params given.
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.br
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.B SXE_ENOMEM
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will be returned if there are no memory available.
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.br
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.B SXE_BADPROTO
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will be returned if other side has an invalid protocol.
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.B SXE_EPERM
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will be returned if permission was denied.
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.br
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.B SXE_NOSUCHSTREAMTYPE
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will be returned in case if no such stream exist on the requested side.
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.br
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.B SXE_LINKERROR
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or
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.B SXE_LINKBROKEN
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will be returned if connection link is broken i.e. SSL read or write was failed due to the broken TCP connection.
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.br
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.SH BUGS
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Not known yet.
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.SH EXAMPLE
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None.
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.SH APPLICATION USAGE
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This type of data transfer is very useful when you need to get a lot of typed data i.e. lists of lists,
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or if you need to get a blob data.
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.SH RATIONALE
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Writing to the stream isn't a fast operation, since base 64 used to transfer a data from client
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to master (master send a raw data instead of base 64 encoded). But it will be changed in the
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future versions.
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.br
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Better to know: fastest stream is not named list of the lists stream, it's also has a cache i.e.
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each read operation doesn't means a real message initiation.
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.SH SEE ALSO
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.BI sxlink_connect(3)
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,
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.BI sxchannel_open(3)
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,
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.BI sxchannel_close(3)
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,
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.BI sxstream_read(3)
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,
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.BI sxstream_readnamed(3)
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,
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.BI sxstream_bread(3)
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.SH COPYRIGHT
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This software licensed under GNU LGPL v3. See COPYING for further details.
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.br
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(c) Askele Group 2013-2015 <http://askele.com>, (c) libsxmp dev team 2016 <http://libsxmp.sf.net>
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.SH AUTHOR
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Alexander Vdolainen (avdolainen@zoho.com)
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sxstream_open.3
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