isunresolved

isunresolved

Test Whether an External Symbol is Resolved

Portability: SAS/C extension

SYNOPSIS
DESCRIPTION
RETURN VALUE
EXAMPLE
SEE ALSO

SYNOPSIS

#include <lcdef.h>

int isunresolved(name);

DESCRIPTION

This macro tests the name (which should be the name of a variable declared as _ _weak ) to determine whether the symbol was resolved by the linkage editor.

RETURN VALUE

isunresolved returns 0 if the symbol is resolved, or a nonzero value if it is not resolved.

EXAMPLE

/* Test whether the function db_open() is present */
/* in the load  module.  If it is, call it.       */

   /* optional database open function */
extern int _ _weak db_open(char *);
               
if (!isunresolved(db_open))
   db_open("DBNAME");

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