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Full Discussion: FIFO possible blocking or unknown error
Homework and Emergencies Homework & Coursework Questions FIFO possible blocking or unknown error Post 302444780 by Corona688 on Thursday 12th of August 2010 07:04:27 PM
Old 08-12-2010
Code:
...
    #undef FIFOSERVER
    #undef FIFOCLIENT
    #define FIFOSERVER fifoNames[1]
    #define FIFOCLIENT fifoNames[2]

#define's are, more or less, literal text replacement operators that happen even before the program is compiled.

For example:

Code:
#define A  FUNCTION_A

A();

void function_c()
{
        A();
}

#undef A
#define A FUNCTION_B
A();

function_c();

When you compile it, the first step it does is preprocessing, which does the text replacement, reducing the code to this:

Code:
FUNCTION_A();

void function_c()
{
        A();
}

FUNCTION_B();

function_c();

meaning function_c calls FUNCTION_A, not FUNCTION_B. So, this text replacement cannot do any logic at runtime. All decisions it makes happen right when the code is compiled. If you want to change what files your function opens, pass it parameters so you can tell it so:
Code:
void chatty(const char *rdfile, const char *wrfile)
{
        ...
}

...


chatty(fifonames[0], fifonames[1]);

...

chatty(fifonames[1], fifonames[0]);

 

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LEARN ABOUT ULTRIX

lmfsetup

lmfsetup(8)						      System Manager's Manual						       lmfsetup(8)

Name
       lmfsetup - License Management Facility PAK registration script

Syntax
       /etc/lmfsetup [ template ]

Description
       The  script allows you to register data supplied by a Product Authorization Key (PAK).  The script prompts you for the data associated with
       each of the fields on a PAK.  When all the data has been entered, the License Management Facility (LMF) ensures there are  entries  against
       all  the mandatory fields, and that the Checksum validates all the license data.  If the data has been entered correctly, the PAK is regis-
       tered in the License Database.  If the data has been entered incorrectly, the appropriate error message is displayed and you are given  the
       opportunity to re-enter the data.

       The template option allows you to register license data from templates in A template containing a partially complete PAK is created by some
       products as part of their installation process.	The script only prompts you for data on the fields that are empty in the template.  If the
       script cannot find the specified template in it searches the current directory.

       The  script  is	provided as an alternative to the command.  This displays a template, which includes the fields on the PAK, and invokes an
       editor so that you can add the license data to the appropriate field.  The command also allows errors to be corrected without having to re-
       enter all the data.

See Also
       lmf(8)
       Guide to Software Licensing

																       lmfsetup(8)
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