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
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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
edited 10 hours ago
jww
1,64632668
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
add a comment |
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
edited 10 hours ago
jww
1,64632668
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
Also see Process control block in Linux on Stack Overflow.
– jww
11 hours ago
add a comment |
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
edited 10 hours ago
jww
1,64632668
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
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
edited 10 hours ago
jww
1,64632668
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
edited 10 hours ago
jww
1,64632668
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
edited 10 hours ago
jww
1,64632668
edited 10 hours ago
jww
1,64632668
edited 10 hours ago
jww
1,64632668
1,64632668
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
asked Aug 18 '14 at 6:26
Mohammad Reza RezwaniMohammad Reza Rezwani
370248
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
add a comment |
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
add a comment |
1 Answer
1
active
oldest
votes
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,statandschedstat), 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.
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
"the head of which isinit_task(pid 0, not pid 1)" There's no such thing asinit_task. It'sinit, and its pid is 1, not 0 (confirmed viapidof 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 yetpidis 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
add a comment |
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1 Answer
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
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,statandschedstat), 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.
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
"the head of which isinit_task(pid 0, not pid 1)" There's no such thing asinit_task. It'sinit, and its pid is 1, not 0 (confirmed viapidof 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 yetpidis 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
add a comment |
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,statandschedstat), 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.
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
"the head of which isinit_task(pid 0, not pid 1)" There's no such thing asinit_task. It'sinit, and its pid is 1, not 0 (confirmed viapidof 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 yetpidis 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
add a comment |
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,statandschedstat), 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.
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
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,statandschedstat), 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.
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
answered Aug 18 '14 at 7:38
FlupFlup
6,13912244
6,13912244
"the head of which isinit_task(pid 0, not pid 1)" There's no such thing asinit_task. It'sinit, and its pid is 1, not 0 (confirmed viapidof 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 yetpidis 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
add a comment |
"the head of which isinit_task(pid 0, not pid 1)" There's no such thing asinit_task. It'sinit, and its pid is 1, not 0 (confirmed viapidof 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 yetpidis 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
add a comment |
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-cpu, linux, process
Also see Process control block in Linux on Stack Overflow.
– jww
11 hours ago