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Full Discussion: How to easily identify socket given a PID on Linux?
Operating Systems Linux How to easily identify socket given a PID on Linux? Post 302995477 by mohtashims on Thursday 6th of April 2017 05:41:25 AM
Old 04-06-2017
Quote:
Originally Posted by drysdalk
Hi,

Ah, you want to check the listening sockets in that case. That's not what you're doing here. You're looking at all established sockets - in other words, connections between your system and another system.

For listening sockets, the netstat syntax you want is netstat -lnpt, and not netstat -anpt (and of course you don't want to be doing a grep ESTABLISHED either). That will show you just the sockets that are open and listening for incoming connections on your local system.

Hope this helps !
This is better but can you tell me how can i extract the ip and port as the output varies from Process to process.

For PID=32538 below is what i get as an ouput

Code:
bash-3.2$ netstat -lnpt | grep 32538
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:7666                0.0.0.0:*                   LISTEN      32538/java
tcp        0      0 ::ffff:10.2.228.79:13804    :::*                        LISTEN      32538/java
tcp        0      0 :::38970                    :::*                        LISTEN      32538/java

First Question: Out of the listings above how can i grep for just the ip and port i.e. in this case 10.2.228.79 & 13804 which is the correct ip port we specified in the configuration. I wish i could ignore the other listings in the output above.

Second question: will fd be a better alternative ? if yes, can you tell me how can i get the listen ip & port from fd command?
 

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LEARN ABOUT SUSE

gettid

GETTID(2)						     Linux Programmer's Manual							 GETTID(2)

NAME

       gettid - get thread identification

SYNOPSIS

       #include <sys/types.h>

       pid_t gettid(void);

DESCRIPTION

       gettid() returns the caller's thread ID (TID).  In a single-threaded process, the thread ID is equal to the process ID (PID, as returned by
       getpid(2)).  In a multithreaded process, all threads have the same PID, but each one has a unique TID.  For further details, see  the  dis-
       cussion of CLONE_THREAD in clone(2).

RETURN VALUE

       On success, returns the thread ID of the calling process.

ERRORS

       This call is always successful.

VERSIONS

       The gettid() system call first appeared on Linux in kernel 2.4.11.

CONFORMING TO

       gettid() is Linux-specific and should not be used in programs that are intended to be portable.

NOTES

       Glibc does not provide a wrapper for this system call; call it using syscall(2).

       The thread ID returned by this call is not the same thing as a POSIX thread ID (i.e., the opaque value returned by pthread_self(3)).

SEE ALSO

       clone(2), fork(2), getpid(2)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-04-14								 GETTID(2)
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