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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(), dler-
       ror() 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 reen-
       trant 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  wish-
       ing  to	preserve an error message should make their own copies of that message. Depending
       on the application environment with respect to asynchronous execution events, such as sig-
       nals  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       DLERROR(P)
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