unw_backtrace - Man Page

return backtrace for the calling program


#include <libunwind.h>

int unw_backtrace(void **buffer, int size);

#include <execinfo.h>

int backtrace(void **buffer, int size);


unw_backtrace() is a convenient routine for obtaining the backtrace for  the calling program. The routine fills up to size addresses in the array  pointed by buffer. The routine is only available for local unwinding.

Note that many (but not all) systems provide practically identical function  called backtrace(). The prototype for this function is usually obtained  by including the <execinfo.h> header file -- a prototype for  backtrace() is not provided by libunwind. libunwind weakly  aliases backtrace() to unw_backtrace(), so when a program  calling backtrace() is linked against libunwind, it may end up  calling unw_backtrace().

Return Value

The routine returns the number of addresses stored in the array pointed by  buffer. The return value may be zero to indicate that no addresses were  stored.

See Also

libunwind(3), unw_step(3)


David Mosberger-Tang
Email: dmosberger@gmail.com
WWW: http://www.nongnu.org/libunwind/.


31 August 2012 Programming Library