callstack.h

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#ifndef CALLSTACK_H
#define CALLSTACK_H
 
#ifdef __amd64__
#include <sys/wait.h>
#include <unistd.h>
#include <sys/prctl.h>
#include <execinfo.h>
 
#include "c_decls.h"
__BEGIN_DECLS /* till __END_DECLS */
 
static inline void callstack() {
    char pid_buf[30];
    sprintf(pid_buf, "%d", getpid());
    char name_buf[512];
    name_buf[readlink("/proc/self/exe", name_buf, 511)]=0;
    prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
    int child_pid = fork();
    if (!child_pid) {
        dup2(2,1); // redirect output to stderr - edit: unnecessary?
        execl("/usr/bin/gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "bt", name_buf, pid_buf, NULL);
        abort(); /* If gdb failed to start */
    } else {
        waitpid(child_pid,NULL,0);
    }
} //static inline void print_trace() =================
 
#  define CALLSTACK() callstack()
#else
#  define CALLSTACK()
#endif
 
__END_DECLS
#endif /* CALLSTACK_H */