Query: dladdr
OS: freebsd
Section: 3
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
DLADDR(3) BSD Library Functions Manual DLADDR(3)NAMEdladdr -- find the shared object containing a given addressLIBRARYStandard C Library (libc, -lc)SYNOPSIS#include <dlfcn.h> int dladdr(const void *addr, Dl_info *info);DESCRIPTIONThe dladdr() function queries the dynamic linker for information about the shared object containing the address addr. The information is returned in the structure specified by info. The structure contains at least the following members: const char *dli_fname The pathname of the shared object containing the address. void *dli_fbase The base address at which the shared object is mapped into the address space of the calling process. const char *dli_sname The name of the nearest run-time symbol with a value less than or equal to addr. When possible, the symbol name is returned as it would appear in C source code. If no symbol with a suitable value is found, both this field and dli_saddr are set to NULL. void *dli_saddr The value of the symbol returned in dli_sname. The dladdr() function is available only in dynamically linked programs.ERRORSIf a mapped shared object containing addr cannot be found, dladdr() returns 0. In that case, a message detailing the failure can be retrieved by calling dlerror(). On success, a non-zero value is returned.SEE ALSOrtld(1), dlopen(3)HISTORYThe dladdr() function first appeared in the Solaris operating system.BUGSThis implementation is bug-compatible with the Solaris implementation. In particular, the following bugs are present: o If addr lies in the main executable rather than in a shared library, the pathname returned in dli_fname may not be correct. The pathname is taken directly from argv[0] of the calling process. When executing a program specified by its full pathname, most shells set argv[0] to the pathname. But this is not required of shells or guaranteed by the operating system. o If addr is of the form &func, where func is a global function, its value may be an unpleasant surprise. In dynamically linked programs, the address of a global function is considered to point to its program linkage table entry, rather than to the entry point of the func- tion itself. This causes most global functions to appear to be defined within the main executable, rather than in the shared libraries where the actual code resides. o Returning 0 as an indication of failure goes against long-standing Unix tradition.BSDFebruary 5, 1998 BSD
Related Man Pages |
---|
dladdr(3c) - opensolaris |
dlclose(3) - netbsd |
dlerror(3) - netbsd |
dlfcn(3) - netbsd |
dlopen(3) - netbsd |
Similar Topics in the Unix Linux Community |
---|
Static objects in libraries |
AIX 5.3 , gensyms command, translate 32 bit addr to 64 bit addr |
Problem In Loading A Shared Object In Linux |
Anyone knows of Qnix OS?? |
dladdr for AIX 5.3 |