Is there a file that associates a thread to its network namespace?

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/proc/[pid]/ns/net contains a link to the inode representing the network namespace of the process with PID [pid]. Is there something similar for threads?



My use case is a multi-threaded application, where there's one main thread and a group of worker threads. The generic worker W creates a new network namespace N with a call to unshare() (which makes W enter N), pushes one end of a veth pair in N and leaves it (it uses an fd pointing to the root namespace to go back to such namespace). Since no processes are in N after W goes back to the root namespace, N is destroyed when that happens, and I do not want that.



The solution I thought about is to mount a link to N somewhere in the filesystem. This is what iproute2 netns does: mounting a link to /proc/[pid]/ns/net. The problem, in my case, is that /proc/[pid]/ns/net keeps referencing the root namespace, only W changes namespace, hence I cannot use it and I need a file/something else which points to the namespace of a thread. Is there such a thing in Linux?










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    4















    /proc/[pid]/ns/net contains a link to the inode representing the network namespace of the process with PID [pid]. Is there something similar for threads?



    My use case is a multi-threaded application, where there's one main thread and a group of worker threads. The generic worker W creates a new network namespace N with a call to unshare() (which makes W enter N), pushes one end of a veth pair in N and leaves it (it uses an fd pointing to the root namespace to go back to such namespace). Since no processes are in N after W goes back to the root namespace, N is destroyed when that happens, and I do not want that.



    The solution I thought about is to mount a link to N somewhere in the filesystem. This is what iproute2 netns does: mounting a link to /proc/[pid]/ns/net. The problem, in my case, is that /proc/[pid]/ns/net keeps referencing the root namespace, only W changes namespace, hence I cannot use it and I need a file/something else which points to the namespace of a thread. Is there such a thing in Linux?










    share|improve this question
























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      /proc/[pid]/ns/net contains a link to the inode representing the network namespace of the process with PID [pid]. Is there something similar for threads?



      My use case is a multi-threaded application, where there's one main thread and a group of worker threads. The generic worker W creates a new network namespace N with a call to unshare() (which makes W enter N), pushes one end of a veth pair in N and leaves it (it uses an fd pointing to the root namespace to go back to such namespace). Since no processes are in N after W goes back to the root namespace, N is destroyed when that happens, and I do not want that.



      The solution I thought about is to mount a link to N somewhere in the filesystem. This is what iproute2 netns does: mounting a link to /proc/[pid]/ns/net. The problem, in my case, is that /proc/[pid]/ns/net keeps referencing the root namespace, only W changes namespace, hence I cannot use it and I need a file/something else which points to the namespace of a thread. Is there such a thing in Linux?










      share|improve this question














      /proc/[pid]/ns/net contains a link to the inode representing the network namespace of the process with PID [pid]. Is there something similar for threads?



      My use case is a multi-threaded application, where there's one main thread and a group of worker threads. The generic worker W creates a new network namespace N with a call to unshare() (which makes W enter N), pushes one end of a veth pair in N and leaves it (it uses an fd pointing to the root namespace to go back to such namespace). Since no processes are in N after W goes back to the root namespace, N is destroyed when that happens, and I do not want that.



      The solution I thought about is to mount a link to N somewhere in the filesystem. This is what iproute2 netns does: mounting a link to /proc/[pid]/ns/net. The problem, in my case, is that /proc/[pid]/ns/net keeps referencing the root namespace, only W changes namespace, hence I cannot use it and I need a file/something else which points to the namespace of a thread. Is there such a thing in Linux?







      linux networking namespace thread network-namespaces






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      asked Jan 13 at 3:07









      MatteoMatteo

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          There is a file that associates a thread to its network namespace:



          /proc/[PID]/task/[TID]/ns/net


          where TID is the thread ID. This solved my issue.






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            There is a file that associates a thread to its network namespace:



            /proc/[PID]/task/[TID]/ns/net


            where TID is the thread ID. This solved my issue.






            share|improve this answer



























              2














              There is a file that associates a thread to its network namespace:



              /proc/[PID]/task/[TID]/ns/net


              where TID is the thread ID. This solved my issue.






              share|improve this answer

























                2












                2








                2







                There is a file that associates a thread to its network namespace:



                /proc/[PID]/task/[TID]/ns/net


                where TID is the thread ID. This solved my issue.






                share|improve this answer













                There is a file that associates a thread to its network namespace:



                /proc/[PID]/task/[TID]/ns/net


                where TID is the thread ID. This solved my issue.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Jan 15 at 2:52









                MatteoMatteo

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