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DLERROR(3P)                POSIX Programmer's Manual               DLERROR(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 sec-
       ond 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 application environment with respect to asynchronous execu-
       tion events, such as signals or other asynchronous computation sharing the address space,  conforming  applica-
       tions 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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(3P)