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Can't get cmdline

Hi @kaegi !

Thank you for your very useful crates.

I run the example, but can't get cmdline.

extern crate procps_sys;
use procps_sys::readproc::{openproc, readproc, closeproc, proc_t};
use std::ffi::CStr;
use std::ptr::null_mut;


fn main() {
    unsafe {
        // intialize query for process list
        let proctab = openproc(/* fills cmdline line attribute */
                               procps_sys::readproc::PROC_FILLCOM);

        // go through all processes
        let mut procinfo = proc_t::default();
        while readproc(proctab, &mut procinfo) != null_mut() {

            // read cmdline attribute
            let cmdline = if procinfo.cmdline == null_mut() {
                "".to_string()
            } else {
                CStr::from_ptr(*procinfo.cmdline)
                    .to_string_lossy()
                    .into_owned()
            };

            // print information
            println!("pid: {} cmdline: \"{}\"", procinfo.tid, cmdline);
        }
        closeproc(proctab);
    }
}
$ cargo run

(snip)

pid: 862 cmdline: ""
pid: 867 cmdline: ""
pid: 869 cmdline: ""
pid: 873 cmdline: ""
pid: 884 cmdline: ""
pid: 898 cmdline: ""
pid: 901 cmdline: ""
pid: 992 cmdline: ""
pid: 1007 cmdline: ""
pid: 1061 cmdline: ""
pid: 1079 cmdline: ""
pid: 1080 cmdline: ""
pid: 1155 cmdline: ""
pid: 1170 cmdline: ""
pid: 1179 cmdline: ""
pid: 1181 cmdline: ""
pid: 1189 cmdline: ""
pid: 1232 cmdline: ""
pid: 2768 cmdline: ""
pid: 16229 cmdline: ""
pid: 16234 cmdline: ""
pid: 16510 cmdline: ""
pid: 16512 cmdline: ""
pid: 16514 cmdline: ""
pid: 16515 cmdline: ""
pid: 16572 cmdline: ""
pid: 16573 cmdline: ""
pid: 16629 cmdline: ""
pid: 16630 cmdline: ""
pid: 19256 cmdline: ""
pid: 19309 cmdline: ""
pid: 19310 cmdline: ""
pid: 22509 cmdline: ""
pid: 23120 cmdline: ""
pid: 23740 cmdline: ""

(snip)

I think char ** is always empty on Rust. but the following C code is run normaly.

$ cat misc/a.c 
#include <string.h>
#include <stdio.h>
#include <proc/readproc.h>

int main(int argc, char **argv) {

  PROCTAB *proc = openproc(PROC_FILLMEM | PROC_FILLSTAT | PROC_FILLSTATUS | PROC_FILLCOM);
  proc_t *proc_info;

  while ((proc_info = readproc(proc, NULL)) != NULL) {
          if (proc_info->cmdline != NULL) {
    printf("%20s:\t%5ld\t%5lld\t%5lld\t%20s\n", proc_info->cmd, proc_info->resident,
           proc_info->utime, proc_info->stime, proc_info->cmdline[0]);
    freeproc(proc_info);
          }
  }

  closeproc(proc);
}
$ gcc misc/a.c -lprocps
$ ./a.out 
             systemd:    1485     119    1498             /sbin/init
     systemd-journal:    1069      12       9   /lib/systemd/systemd-journald
             lvmetad:     359       0       0          /sbin/lvmetad
       systemd-udevd:     979       4       3   /lib/systemd/systemd-udevd
            dhclient:     724       0       0         /sbin/dhclient
                cron:     742       4       1         /usr/sbin/cron
            rsyslogd:     885       2       2     /usr/sbin/rsyslogd
               lxcfs:    1031      10      19         /usr/bin/lxcfs
         dbus-daemon:     971     105      46   /usr/bin/dbus-daemon
               snapd:    3397       7       1   /usr/lib/snapd/snapd
               acpid:     305       0       0        /usr/sbin/acpid
      systemd-logind:     792       0       5   /lib/systemd/systemd-logind
     accounts-daemon:    1574      43      24   /usr/lib/accountsservice/accounts-daemon
                 atd:     544       0       0          /usr/sbin/atd
               mdadm:      42       0       0            /sbin/mdadm
             polkitd:    2026       1       0   /usr/lib/policykit-1/polkitd
           memcached:     654     106      70     /usr/bin/memcached
        redis-server:    2191     996    2274   /usr/bin/redis-server 127.0.0.1:6379
                sshd:    1596       0       0         /usr/sbin/sshd
              iscsid:      39      48      84           /sbin/iscsid
              iscsid:     878     173     464           /sbin/iscsid
         VBoxService:     627      34     745   /usr/sbin/VBoxService
          irqbalance:      56      16      66   /usr/sbin/irqbalance

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