unw_get_elf_filename - Man Page

#include <libunwind.h>

int unw_get_elf_filename(unw_cursor_t *cp, char *bufp, size_t len, unw_word_t *offp);

The unw_get_elf_filename() routine returns the backing elf  filename of the current instruction pointer that created the stack frame  identified by argument cp. The bufp argument is a pointer  to a character buffer that is at least len bytes long. This buffer  is used to return the name of the procedure. The offp argument is  a pointer to a word that is used to return the byte offset of the instruction  pointer saved in the stack frame identified by cp, relative to the  start of the elf file. For embedded system the symbol information may has  been stripped from a program, then unw_get_proc_name() may be  completely unavailable, if the host side have the unstripped program with  debuginfo, then can use addr2line command tool on host to get the  source file name and line number of the instruction pointer, with the elf  filename in bufp and address in offp.

On successful completion, unw_get_elf_filename() returns 0.  Otherwise the negative value of one of the error codes below is  returned.

unw_get_elf_filename() is thread safe. If cursor cp is  in the local address space, this routine is also safe to use from a  signal handler.

UNW_EUNSPEC

An unspecified error occurred.

UNW_ENOINFO

Libunwind was unable to determine  the elf filename of the instruction pointer.

UNW_ENOMEM

The elf filename is too long to fit  in the buffer provided. A truncated version of the name has been  returned.

libunwind(3libunwind), unw_get_proc_info(3libunwind) unw_get_proc_name(3libunwind) unw_get_elf_filename_by_ip(3libunwind) addr2line(1addr2line)

Xiang Lin
Email: myd.xia@gmail.com