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#include <sys/ptrace.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <libunwind-ptrace.h>
void die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
int main(int argc, char **argv)
{
if (argc != 2)
die("USAGE: unwind-pid <pid>\n");
unw_addr_space_t as = unw_create_addr_space(&_UPT_accessors, 0);
pid_t pid = atoi(argv[1]);
if (ptrace(PTRACE_ATTACH, pid, 0, 0) != 0)
die("ERROR: cannot attach to %d\n", pid);
void *context = _UPT_create(pid);
unw_cursor_t cursor;
if (unw_init_remote(&cursor, as, context) != 0)
die("ERROR: cannot initialize cursor for remote unwinding\n");
do {
unw_word_t offset, pc;
char sym[4096];
if (unw_get_reg(&cursor, UNW_REG_IP, &pc))
die("ERROR: cannot read program counter\n");
printf("0x%lx: ", pc);
if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0)
printf("(%s+0x%lx)\n", sym, offset);
else
printf("-- no symbol name found\n");
} while (unw_step(&cursor) > 0);
_UPT_destroy(context);
(void) ptrace(PTRACE_DETACH, pid, 0, 0);
return 0;
}
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