dlerror man page on Archlinux

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

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

       dlerror — get diagnostic information

       #include <dlfcn.h>

       char *dlerror(void);

       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.

       It  is  implementation-defined whether or not the dlerror() function is
       thread-safe. A thread-safe implementation shall return only errors that
       occur on the current thread.

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

       The application shall not modify	 the  string  returned.	 The  returned
       pointer might be invalidated or the string content might be overwritten
       by a subsequent call to dlerror() in the same thread (if	 dlerror()  is
       thread-safe) or in any thread (if dlerror() is not thread-safe).

       No errors are defined.

       The following sections are informative.

       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);

       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 criti‐
       cal section to retrieve the error pointer and buffer.



       dlclose(), dlopen(), dlsym()

       The Base Definitions volume of POSIX.1‐2008, <dlfcn.h>

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			   DLERROR(3P)

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