check all socket opened in linux OS

Question

My program opens a socket with this function       sockfd   socket AF INET  SOCK RAW  IPPROTO ICMP    After finish sending data the socket is closed       close sockfd     But the issue is when the program doesn t run well and is blocking  Thereby the socket will not be closed     How can I check all sockets opened under Linux OS

User · Answer

Also you can use ss utility to dump sockets statistics.

To dump summary:

ss -s

Total: 91 (kernel 0)
TCP:   18 (estab 11, closed 0, orphaned 0, synrecv 0, timewait 0/0), ports 0

Transport Total     IP        IPv6
*         0         -         -        
RAW       0         0         0        
UDP       4         2         2        
TCP       18        16        2        
INET      22        18        4        
FRAG      0         0         0

To display all sockets:

ss -a

To display UDP sockets:

ss -u -a

To display TCP sockets:

ss -t -a

Here you can read ss man: ss

User · Answer

You can use netstat command       netstat --listen   To display open ports and established TCP connections        netstat -vatn   To display only open UDP ports try the following command        netstat -vaun

User · Answer

proc net tcp -a list of open tcp sockets       proc net udp -a list of open udp sockets       proc net raw -a list all the  raw  sockets   These are the files  use cat command to view them  For example   cat  proc net tcp  You can also use the lsof command      lsof is a command meaning  list open files   which is used in many   Unix-like systems to report a list of all open files and the processes   that opened them

[c] check all socket opened in linux OS

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