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README

1. Gflags Module

Jiri Kuthan

   <jiri@iptel.org>

   Copyright © 2004 FhG FOKUS
     __________________________________________________________________

   1.1. Overview
   1.2. Parameters

        1.2.1. initial (integer)

   1.3. Functions

        1.3.1. set_gflag(flag_num)
        1.3.2. reset_gflag(flag_num)
        1.3.3. is_gflag(flag_num)

   1.4. FIFO Interface
   1.5. XMLRPC Interface

1.1. Overview

   The module implements global flags. The difference between the global
   flags and flags that can be used in the configuration file or AVPs is
   that they the scope of the global flags is not limited to the SIP
   message or transaction being processed. Global flags are always
   available, their contents is not forgotten when a SIP transaction gets
   destroyed in SER.

   Global flags can be accessed from the configuration script, for
   example:
if (is_gflag("1")) {
    t_relay_to_udp("10.0.0.1", "5060");
} else {
    t_relay_to_udp("10.0.0.2", "5060");
};

   The value of the global flags can be manipulated by external tools such
   as the web interface of SER or cmd line administration tools. One
   particular application of global flags could be runtime configuration
   changes without the need to restart SER.

1.2. Parameters

1.2.1. initial (integer)

   The initial value of global flags. Each bit in the integer represents
   one flag.

   Default value is 0.

1.3. Functions

1.3.1. set_gflag(flag_num)

   Set the flag identified by flag_num to 1. The range of flag_num is 0 to
   31.

   Example 1. set_gflag usage
...
set_gflag("2");
...

1.3.2. reset_gflag(flag_num)

   Set the flag identified by flag_num to 0. The range of flag_num is 0 to
   31.

   Example 2. reset_gflag usage
...
reset_gflag("2");
...

1.3.3. is_gflag(flag_num)

   Returns 1 when flag identified by flag_num is set, 0 otherwise. The
   range of flag_num parameter is 0 to 31.

1.4. FIFO Interface

   The state of the global flags can be read and modified over the FIFO
   interface of SER. This module implements the following FIFO interface
   functions:
     * set_gflag - Set the value of a flag to 1. The function accepts one
       parameter which is the number of the flag to be set.
     * reset_gflag - Reset the value of a flag to 0. The function accepts
       one parameter which is the number of the flag to be reset.
     * is_gflag - Return the status of a flag. The FIFO function would
       return TRUE if the flag is set and FALSE if it is not set. The only
       parameter of this function is the number of the flag.

1.5. XMLRPC Interface

   The state of the global flags can be read and modified over the XMLRPC
   interface. This module implements the following XMLRPC interface
   commands:
     * gflags.set - Set the value of a flag to 1. The function accepts one
       parameter which is the number of the flag to be set.
     * gflags.reset - Reset the value of a flag to 0. The function accepts
       one parameter which is the number of the flag to be reset.
     * gflags.is_set - Return the status of a flag. The FIFO function
       would return TRUE if the flag is set and FALSE if it is not set.
       The only parameter of this function is the number of the flag.
     * gflags.flush - Flush the state of global flags into database.
     * gflags.dump - Return the status of all flags. The value is TRUE if
       the flag is set and FALSE if the flag is not set. The function has
       no parameters.
     * global.reload - Reload values from global_attrs DB table. This
       function does not have any parameters. There is no return value on
       success.
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