NAME

dlerror − get diagnostic information

SYNOPSIS

cc [flag ...] file ...  −ldl [library ...]

#include <dlfcn.h>

char ∗dlerror(void);

DESCRIPTION

dlerror returns 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 returns NULL.  Thus, invoking dlerror a second time, immediately following a prior invocation, results in NULL being returned. 

This routine is available in a library that is loaded if the option -ldl is used with cc or ld.  The -ldl library (and the routines it contains) may not be used when a program is to be statically linked. 

SEE ALSO

dlclose(3X), dlopen(3X), dlsym(3X)

NOTES

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. 

  —  C Development Set