OSX: proc_pidinfo returns 0 for other user's processes

Question

I need to get some information (PID, UID, GID, process name) about running processes on Mac OSX. I tried proc_pidinfo. For my own processes it works fine. However,

Answer 1

You can use :

int proc_listpids(uint32_t type, uint32_t typeinfo, void *buffer, int buffersize);

combinated to proc_pidinfo to get many others pids informations like :

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

void procpid(pid_t pid)
{ struct proc_bsdinfo proc;
  int st = proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
  printf("name: %s\n", proc.pbi_name);
}

void pidlist(void)
{ int bufsize = proc_listpids(PROC_ALL_PIDS, 0, NULL, 0);
  pid_t pids[2 * bufsize / sizeof(pid_t)];
  bufsize = proc_listpids(PROC_ALL_PIDS, 0, pids, sizeof(pids));
  size_t num_pids = bufsize / sizeof(pid_t);
  int i = 0;
  while (i < num_pids)
  { printf("pid[%d]::%d\n", i, pids[i]);
    procpid(pids[i]);
    printf("\n-------------------------------\n\n");
    i += 1; }}

int main(void)
{ pidlist();
  return(42); }