Originální popis anglicky:
dlerror - get diagnostic information
Návod, kniha: POSIX Programmer's Manual
#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.
The
dlerror() function need not be reentrant. A function that is not
required to be reentrant 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:
...
#include <dlfcn.h>
char *errstr;
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 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.
None.
None.
dlclose() ,
dlopen() ,
dlsym() , the Base Definitions
volume of IEEE Std 1003.1-2001,
<dlfcn.h>
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 original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
