dlerror(3c) [opensolaris man page]

dlerror(3C)						   Standard C Library Functions 					       dlerror(3C)

NAME

       dlerror - get diagnostic information

SYNOPSIS

       #include <dlfcn.h>

       char *dlerror(void);

DESCRIPTION

       The  dlerror()  function returns a null-terminated character string that describes the last error that occurred during dynamic linking pro-
       cessing. The returned string contains no trailing newline. If no dynamic linking errors have occurred since the last  invocation  of  dler-
       ror(),  dlerror()  returns  NULL.  Thus, invoking  dlerror() a second time, immediately following a prior invocation, results in NULL being
       returned.

USAGE

       The dlerror() function is one of a family of functions that give the user direct access to the dynamic linking facilities. These facilities
       are available to dynamically-linked processes only. See Linker and Libraries Guide.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ld(1), dladdr(3C), dlclose(3C), dldump(3C), dlopen(3C), dlsym(3C), attributes(5), standards(5)

       Linker and Libraries Guide

NOTES

       The  messages  returned	by  dlerror() can reside in a static buffer that is overwritten on each call to dlerror(). Application code should
       not write to this buffer. Programs wanting to preserve an error message should make their own copies of that message.

SunOS 5.11							    1 Mar 2004							       dlerror(3C)

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 differ (consult the correspond-
       ing 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 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)
", 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 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 Technol-
       ogy -- 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(3P)