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Full Discussion: Function Returning Value w/o return stmt
Top Forums Programming Function Returning Value w/o return stmt Post 302357092 by jim mcnamara on Monday 28th of September 2009 04:52:50 PM
Old 09-28-2009
First off, compile with gcc -Wall then it won't happen again if you pay attention to warnings. A good compile is zero warnings and zero errors, nothing else is acceptable.

When a function returns an int and nothing is returned by the function - then - whatever garbage data was living on the stack is what gets returned. ie., any value is possible. If your code looks like
Code:
int retval=0;
retval=myfunc();
if(retval)
   // good return
else
  // zero == error return

Then any garbage on the stack will result in a "good" return. This is called programming by coincidence, in polite circles, when it actually works.
 

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LEARN ABOUT CENTOS

papi_event_name_to_code

PAPI_event_name_to_code(3)					       PAPI						PAPI_event_name_to_code(3)

NAME

       PAPI_event_name_to_code -

       Convert a name to a numeric hardware event code.

SYNOPSIS

Detailed Description
       @par C Interface:
       int PAPI_event_name_to_code( char * EventName, int * EventCode );

       PAPI_event_name_to_code is used to translate an ASCII PAPI event name
       into an integer PAPI event code.

       @param *EventCode
	   The numeric code for the event.
       @param *EventName
	   A string containing the event name as listed in PAPI_presets or discussed in PAPI_native.

       @retval PAPI_EINVAL
	   One or more of the arguments is invalid.
       @retval PAPI_ENOTPRESET
	   The hardware event specified is not a valid PAPI preset.
       @retval PAPI_ENOINIT
	   The PAPI library has not been initialized.
       @retval PAPI_ENOEVNT
	   The hardware event is not available on the underlying hardware.

       @par Examples:

       *   int EventCode, EventSet = PAPI_NULL;
       *   // Convert to integer
       *   if ( PAPI_event_name_to_code( "PAPI_TOT_INS", &EventCode ) != PAPI_OK )
       *   handle_error( 1 );
       *   // Create the EventSet
       *   if ( PAPI_create_eventset( &EventSet ) != PAPI_OK )
       *   handle_error( 1 );
       *   // Add Total Instructions Executed to our EventSet
       *   if ( PAPI_add_event( EventSet, EventCode ) != PAPI_OK )
       *   handle_error( 1 );
       *

       See Also:
	   PAPI_event_code_to_name

	   PAPI_remove_event

	   PAPI_get_event_info

	   PAPI_enum_event

	   PAPI_add_event

	   PAPI_add_named_event

	   PAPI_presets

	   PAPI_native

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014					PAPI_event_name_to_code(3)
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