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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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). The returned pointer might also be invalidated
if the calling thread is terminated.
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 critical section to retrieve the error
pointer and buffer.
None.
None.
dlclose(3p), dlopen(3p), dlsym(3p)
The Base Definitions volume of POSIX.1‐2017, dlfcn.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 DLERROR(3P)
Pages that refer to this page: dlfcn.h(0p), dlclose(3p), dlopen(3p), dlsym(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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