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 · Accepted 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

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

[c] check all socket opened in linux OS

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