DLERROR(P) POSIX Programmer's Manual DLERROR(P)
dlerror - get diagnostic information
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.
If successful, dlerror() shall return a null-terminated character string; otherwise, NULL
shall be returned.
No errors are defined.
The following sections are informative.
The following example prints out the last dynamic linking error:
errstr = dlerror();
if (errstr != NULL)
printf ("A dynamic linking error occurred: (%s)\n", errstr);
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.
dlclose() , dlopen() , dlsym() , the Base Definitions volume of IEEE Std 1003.1-2001,
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)