root@ubuntu:~# ls /proc/
1   1143 1345 1447 2   2292 29  331  393 44  63  70  76  acpi    diskstats  irq     locks     sched_debug  sysvipc      zoneinfo
10  1145 1357 148  20  23  290 332  396 442  64  7019 77  asound   dma     kallsyms   mdstat    schedstat   thread-self
1042 1149 1361 149  2084 2425 291 34  398 45  65  7029 8  buddyinfo driver    kcore    meminfo    scsi      timer_list
1044 1150 1363 15  2087 25  3  3455 413 46  66  7079 83  bus    execdomains keys     misc     self      timer_stats
1046 1151 1371 16  2090 256  30  35  418 47  6600 7080 884 cgroups  fb      key-users  modules    slabinfo    tty
1048 1153 1372 17  21  26  302 36  419 5   67  71  9  cmdline  filesystems kmsg     mounts    softirqs    uptime
11  1190 1390 18  22  27  31  37  420 518  6749 72  96  consoles  fs      kpagecgroup mtrr     stat      version
1126 12  143  182  2214 28  32  373  421 524  68  73  97  cpuinfo  interrupts  kpagecount  net      swaps     version_signature
1137 1252 1434 184  2215 280  327 38  422 525  69  74  98  crypto   iomem    kpageflags  pagetypeinfo sys      vmallocinfo
1141 13  144  190  2262 281  33  39  425 5940 7   75  985 devices  ioports   loadavg   partitions  sysrq-trigger vmstat

root@ubuntu:~# ls /proc/1/
attr/      cmdline     environ     io        mem       ns/       pagemap     schedstat    stat       timers
autogroup    comm       exe       limits      mountinfo    numa_maps    personality   sessionid    statm      uid_map
auxv       coredump_filter fd/       loginuid     mounts      oom_adj     projid_map    setgroups    status      wchan
cgroup      cpuset      fdinfo/     map_files/    mountstats    oom_score    root/      smaps      syscall     
clear_refs    cwd/       gid_map     maps       net/       oom_score_adj  sched      stack      task/

# ls /sys
block bus class dev devices firmware fs hypervisor kernel module power

#include <asm/types.h>
#include <sys/socket.h>
#include <linux/netlink.h>

netlink_socket = socket(AF_NETLINK, socket_type, netlink_family);