4.1.3 Checking Return Codes

Most Intel® Dialogic® library functions return a value of -1 if they fail (extended attribute functions return -1 or AT_FAILUREP). Therefore, any call to a library function should check for a return value indicating an error. This can be done by using a format similar to the following:

/* call to Intel® Dialogic® MSI/SC library function */  
if (ms_xxx(arguments) == -1) {
    /* error handling routine */
}
/* successful function call -
    continue processing ...  */  

Using this technique ensures that all errors resulting from a library call will be trapped and handled properly by the application. In many cases, you can check for a return value of other than zero (0), however, this should only be used where a nonzero value is returned when the function fails. For details, see Chapter 3, "Error Handling".

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