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Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Volker Lendecke <vl@samba.org> Autobuild-User(master): Stefan Metzmacher <metze@samba.org> Autobuild-Date(master): Wed Oct 16 11:39:41 CEST 2013 on sn-devel-104
74 lines
2.8 KiB
Plaintext
74 lines
2.8 KiB
Plaintext
libsamba-hostconfig
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-------------------
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This directory contains "libsamba-hostconfig".
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The libsamba-hostconfig library provides access to all host-wide configuration
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such as the configured shares, default parameter values and host secret keys.
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Adding a parameter
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------------------
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To add or change an smb.conf option, you only have to modify
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lib/param/param_table.c and lib/param/param_functions.c. The rest is
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generated for you.
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Using smb.conf parameters in the code
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-------------------------------------
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Call the lpcfg_*() function. To get the lp_ctx, have the caller pass
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it to you. To get a lp_ctx for the source3/param loadparm system, use:
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struct loadparm_context *lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
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Remember to talloc_unlink(tmp_ctx, lp_ctx) the result when you are done!
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To get a lp_ctx for the lib/param loadparm system, typically the
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pointer is already set up by popt at startup, and is passed down from
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cmdline_lp_ctx.
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In pure source3/ code, you may use lp_*() functions, but are
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encouraged to use the lpcfg_*() functions so that code can be made
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common.
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How does loadparm_init_s3() work?
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---------------------------------
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loadparm_s3_helpers() returns a initialised table of function
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pointers, pointing at all global lp_*() functions, except for those
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that return substituted strings (% macros). The lpcfg_*() function
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then calls this plugged in function, allowing the one function and
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pattern to use either loadparm system.
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There is a lot of generated code, here, what generates what?
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------------------------------------------------------------
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The regular format of the CPP macros in param_functions.c is used to
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generate up the prototypes (mkproto.pl, mks3param_proto.pl), the service
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and globals table (mkparamdefs.pl), the glue table (mmks3param.pl) and
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the initilisation of the glue table (mks3param_ctx_table.pl).
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I have tried combining some of these, but it just makes the scripts more
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complex.
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The CPP macros are defined in and expand in lib/param/loadparm.c and
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source3/param/loadparm.c to read the values from the generated
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stuctures. They are CPP #included into these files so that the same
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macro has two definitions, depending on the system it is loading into.
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Why was this done, rather than a 'proper' fix, or just using one system or the other?
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-------------------------------------------------------------------------------------
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This was done to allow merging from both ends - merging more parts of
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the loadparm handling, and merging code that needs to read the
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smb.conf, without having to do it all at once. Ideally
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param_functions.c would be generated from param_table.c or (even
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better) our XML manpage source, and the CPP macros would instead be
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generated expanded as generated C files, but this is a task nobody has
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taken on yet.
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