Where is PCB on Linux Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionSave entire process for continuation after rebootHow does copy-on-write in fork() handle multiple fork?/usr/bin/random using a lot of CPUProcess scheduling data on linuxWhat is the relationship between the stack and the process table?Is a light weight process attached to a kernel thread in Linux?is `write()` asynchronous write?What kinds of files can be dynamically loaded?understanding how threads are created inside linux operating systemLegitimate reasons for a program to intercept, internally handle and ignore SIGINT signal

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Where is PCB on Linux



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionSave entire process for continuation after rebootHow does copy-on-write in fork() handle multiple fork?/usr/bin/random using a lot of CPUProcess scheduling data on linuxWhat is the relationship between the stack and the process table?Is a light weight process attached to a kernel thread in Linux?is `write()` asynchronous write?What kinds of files can be dynamically loaded?understanding how threads are created inside linux operating systemLegitimate reasons for a program to intercept, internally handle and ignore SIGINT signal



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








9















A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu







share|improve this question
























  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago

















9















A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu







share|improve this question
























  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago













9












9








9


4






A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu







share|improve this question
















A PCB is a process control block , this is its definition on Wikipedia




Process Control Block (PCB, also called Task Controlling Block,[1]
Task Struct, or Switchframe) is a data structure in the operating
system kernel containing the information needed to manage a particular
process. The PCB is "the manifestation of a process in an operating
system




and its duty is :



Process identification data
Processor state data
Process control data


So where is the PCB of a process to be found?






linux process cpu




linux process cpu






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 10 hours ago









jww

1,64632668




1,64632668










asked Aug 18 '14 at 6:26









Mohammad Reza RezwaniMohammad Reza Rezwani

370248




370248












  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago

















  • Also see Process control block in Linux on Stack Overflow.

    – jww
    11 hours ago
















Also see Process control block in Linux on Stack Overflow.

– jww
11 hours ago





Also see Process control block in Linux on Stack Overflow.

– jww
11 hours ago










1 Answer
1






active

oldest

votes


















12














In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer























  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39











Your Answer








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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









12














In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer























  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39















12














In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer























  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39













12












12








12







In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.






share|improve this answer













In the Linux kernel, each process is represented by a task_struct in a doubly-linked list, the head of which is init_task (pid 0, not pid 1). This is commonly known as the process table.



In user mode, the process table is visible to normal users under /proc. Taking the headings for your question:



  • Process identification data is the process ID (which is in the path /proc/<process-id>/...), the command line (cmd), and possibly other attributes depending on your definition of 'identification'.


  • Process state data includes scheduling data (sched, stat and schedstat), what the process is currently waiting on (wchan), its environment (environ) etc.


  • Process control data could be said to be its credentials (uid_map) and resource limits (limits).


So it all depends how you define your terms... but in general, all data about a process can be found in /proc.







share|improve this answer












share|improve this answer



share|improve this answer










answered Aug 18 '14 at 7:38









FlupFlup

6,13912244




6,13912244












  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39

















  • "the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

    – AleksandrH
    Sep 15 '18 at 14:42






  • 1





    @AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

    – Flup
    Sep 15 '18 at 15:39











  • And yet pid is only for processes...

    – AleksandrH
    Sep 15 '18 at 16:38











  • @AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

    – Flup
    Sep 15 '18 at 16:39
















"the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

– AleksandrH
Sep 15 '18 at 14:42





"the head of which is init_task (pid 0, not pid 1)" There's no such thing as init_task. It's init, and its pid is 1, not 0 (confirmed via pidof init).

– AleksandrH
Sep 15 '18 at 14:42




1




1





@AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

– Flup
Sep 15 '18 at 15:39





@AleksandrH init_task is a kernel structure and not a process. It points to the idle task which is internally represented by pid 0. init_task and init are completely different things.

– Flup
Sep 15 '18 at 15:39













And yet pid is only for processes...

– AleksandrH
Sep 15 '18 at 16:38





And yet pid is only for processes...

– AleksandrH
Sep 15 '18 at 16:38













@AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

– Flup
Sep 15 '18 at 16:39





@AleksandrH Read init/init_task.c in the kernel source tree (github.com/torvalds/linux/blob/master/init/init_task.c).

– Flup
Sep 15 '18 at 16:39

















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