nguyen-phillip

import ctypes

libproc = ctypes.cdll.LoadLibrary('/usr/lib/libproc.dylib')

# int proc_listallpids(void * buffer, int buffersize)
libproc.proc_listallpids.res_type = ctypes.c_int
libproc.proc_listallpids.arg_types = [ctypes.c_void_p, ctypes.c_int]

# int proc_pidpath(int pid, void * buffer, uint32_t buffersize)
libproc.proc_pidpath.res_type = ctypes.c_int

nguyen-phillip

#include <stdio.h>
#include <stdlib.h>
#include <libproc.h>

// Uses proc_pidinfo from libproc.h to find the parent of given pid.
// Call this repeatedly until ppid(pid) == pid to get ancestors.
int ppid(pid_t pid) {
    struct proc_bsdinfo info;
    proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &info, sizeof(info));
    return info.pbi_ppid;