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DLERROR(P)		   POSIX Programmer's Manual		    DLERROR(P)

NAME
       dlerror - get diagnostic information

SYNOPSIS
       #include <dlfcn.h>

       char *dlerror(void);

DESCRIPTION
       The  dlerror() function shall return a null-terminated character string
       (with no	 trailing  <newline>)  that  describes	the  last  error  that
       occurred	 during	 dynamic  linking  processing.	If  no dynamic linking
       errors have occurred since the last invocation of dlerror(),  dlerror()
       shall return NULL.  Thus, invoking dlerror() a second time, immediately
       following a prior invocation, shall result in NULL being returned.

       The dlerror() function need not be reentrant. A function	 that  is  not
       required to be reentrant is not required to be thread-safe.

RETURN VALUE
       If  successful,	dlerror()  shall  return  a  null-terminated character
       string; otherwise, NULL shall be returned.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       The following example prints out the last dynamic linking error:

	      ...
	      #include <dlfcn.h>

	      char *errstr;

	      errstr = dlerror();
	      if (errstr != NULL)
	      printf ("A dynamic linking error occurred: (%s)\n", errstr);
	      ...

APPLICATION USAGE
       The messages returned by dlerror() may reside in a static  buffer  that
       is  overwritten on each call to dlerror().  Application code should not
       write to this buffer. Programs wishing to  preserve  an	error  message
       should make their own copies of that message. Depending on the applica‐
       tion environment with respect to asynchronous execution events, such as
       signals	or  other  asynchronous computation sharing the address space,
       conforming applications should use a critical section to	 retrieve  the
       error pointer and buffer.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       dlclose()  ,  dlopen()  ,  dlsym()  ,  the  Base	 Definitions volume of
       IEEE Std 1003.1-2001, <dlfcn.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			    DLERROR(P)
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