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From "Dinesh Premalal (JIRA)" <>
Subject [jira] Commented: (AXIS2C-252) Use __attribute__ ((warn_unused_result)) to detect failure to check function return values
Date Mon, 02 Apr 2007 15:04:32 GMT


Dinesh Premalal commented on AXIS2C-252:

Do we want to add this attribute to the functions, that we expose to outside world. I think,
it is enough to add it for internal functions.

> Use __attribute__ ((warn_unused_result)) to detect failure to check function return values
> ------------------------------------------------------------------------------------------
>                 Key: AXIS2C-252
>                 URL:
>             Project: Axis2-C
>          Issue Type: Bug
>    Affects Versions: Current (Nightly)
>            Reporter: James Clark
>             Fix For: 1.0.0
> I've noticed several cases where the return values of functions which should be checked
aren't being checked.  Things should be set up so that these cases can be detected automatically.
 I think the way to do this is to leverage gcc's warn_unused_result attribute. Here's the
relevant excerpt from the gcc manual:
> `warn_unused_result'
>      The `warn_unused_result' attribute causes a warning to be emitted
>      if a caller of the function with this attribute does not use its
>      return value.  This is useful for functions where not checking the
>      result is either a security problem or always a bug, such as
>      `realloc'.
>           int fn () __attribute__ ((warn_unused_result));
>           int foo ()
>           {
>             if (fn () < 0) return -1;
>             fn ();
>             return 0;
>           }
>      results in warning on line 5.

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