Process - Revision history

Pbug: /* Debugging a process that's running */ process context lifetime

2013-03-28T16:24:38Z

Debugging a process that's running: process context lifetime

← Older revision		Revision as of 09:24, 28 March 2013
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	Where program is the program that's running (ie. /bin/ls) and 1234 is the [[pid]] of the process. As soon as you attach the processes execution stops and isn't resumed until you quit, step through or continue (after perhaps setting a few breakpoints).		Where program is the program that's running (ie. /bin/ls) and 1234 is the [[pid]] of the process. As soon as you attach the processes execution stops and isn't resumed until you quit, step through or continue (after perhaps setting a few breakpoints).

			== A process context lifetime? ==

			In a [[UBO]] a process doesn't RUN for very long. Since UNIX is a multitasking system, other processes are given the chance to run too. Usually there is a timeout how long a process can run in [[userland]] mode before being context switched. Another way a context switch occurs if a process calls a [[system call]].

Pbug: /* Tracing a Process in BSD */

2008-05-30T20:29:39Z

Tracing a Process in BSD

← Older revision		Revision as of 13:29, 30 May 2008
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	== Tracing a Process in BSD ==		== Tracing a Process in BSD ==

	[[BSD]] has the [[ktrace]] command. With it a processes [[syscall]]s can be traced. By default ktrace writes the file "ktrace.out". To switch off tracing a simple "ktrace -C" is used. To view the contents of the tracefile you would use [[kdump]]. When you need to trace the child of a process the "-i" flag to ktrace is probably best.		[[BSD]] has the [[ktrace]] command. With it a processes [[syscall]]s can be traced. By default ktrace writes the file "ktrace.out". To switch off tracing a simple "ktrace -C" is used. To view the contents of the tracefile you would use [[ktrace\|kdump]]. When you need to trace the child of a process the "-i" flag to ktrace is probably best.

	12926 ls CALL stat(0x469b6170,0x7f7fffff7490)		12926 ls CALL stat(0x469b6170,0x7f7fffff7490)

Pbug: /* Ending a Process */ oops reversed

2008-05-24T09:21:25Z

Ending a Process: oops reversed

← Older revision		Revision as of 02:21, 24 May 2008
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	$ pkill [[Variables\|process]]		$ pkill [[Variables\|process]]

	You will have to have proper [[permission~~\|permissions~~]] to kill this process. You can optionally include a [[signal]] with pkill.		You will have to have proper [[permissions\|permission]] to kill this process. You can optionally include a [[signal]] with pkill.

	The traditional command to do this is kill(1), which takes the [[pid]] as an argument and optionally the [[signal]] which is supposed to be sent to the process.		The traditional command to do this is kill(1), which takes the [[pid]] as an argument and optionally the [[signal]] which is supposed to be sent to the process.

Pbug: /* Ending a Process */ fix link

2008-05-24T09:20:48Z

Ending a Process: fix link

← Older revision		Revision as of 02:20, 24 May 2008
Line 30:		Line 30:
	$ pkill [[Variables\|process]]		$ pkill [[Variables\|process]]

	You will have to have proper [[permission]] to kill this process. You can optionally include a [[signal]] with pkill.		You will have to have proper [[permission\|permissions]] to kill this process. You can optionally include a [[signal]] with pkill.

	The traditional command to do this is kill(1), which takes the [[pid]] as an argument and optionally the [[signal]] which is supposed to be sent to the process.		The traditional command to do this is kill(1), which takes the [[pid]] as an argument and optionally the [[signal]] which is supposed to be sent to the process.

Pbug: /* Tracing a process with strace (Redhat EL9) */

2008-02-25T19:47:12Z

Tracing a process with strace (Redhat EL9)

← Older revision		Revision as of 12:47, 25 February 2008
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	== Tracing a process with strace (Redhat EL9) ==		== Tracing a process with strace (Redhat EL9) ==

			strace comes with Redhat Enterprise Linux 9 (3) at least on my vserver system.

	[pjp@proteus pjp]$ strace -fo trace.out fire		[pjp@proteus pjp]$ strace -fo trace.out fire
	pbug, fire started.		pbug, fire started.
	Process 11552 attached		Process 11552 attached

			This dumps all information into the file trace.out...

	[pjp@proteus pjp]$ head trace.out		[pjp@proteus pjp]$ head trace.out
Line 88:		Line 92:
	11551 close(3) = 0		11551 close(3) = 0

			A bunch of files are opened here in the preload (dynamic linker) of system libraries, there is a lot more after the dynamic libraries are loaded.

	== Debugging a process that's running ==		== Debugging a process that's running ==

Pbug: /* Description of a process */

2008-02-25T19:44:21Z

Description of a process

← Older revision		Revision as of 12:44, 25 February 2008
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	=== Ending a Process ===		== Ending a Process ==

	A user can end a process by killing it. By default the TERM (15) signal is sent. It is wise to send a TERM signal to a process so that it can trap this signal and do possible safe shutdown's of open files or databases. When it is absolutely necessary to immediately kill a process the KILL (9) signal is used, the process terminates immediately without being able to safely shut anything off. Sometimes a process is "in-disk" (state D in a ps listing) meaning it is awaiting i/o from the kernel. In this state a process cannot be killed at all and it may be wedged forever until the next boot of the system.		A user can end a process by killing it. By default the TERM (15) signal is sent. It is wise to send a TERM signal to a process so that it can trap this signal and do possible safe shutdown's of open files or databases. When it is absolutely necessary to immediately kill a process the KILL (9) signal is used, the process terminates immediately without being able to safely shut anything off. Sometimes a process is "in-disk" (state D in a ps listing) meaning it is awaiting i/o from the kernel. In this state a process cannot be killed at all and it may be wedged forever until the next boot of the system.
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	Here is a list of [[signal]]s.		Here is a list of [[signal]]s.

	=== Tracing a Process in BSD ===		== Tracing a Process in BSD ==

	[[BSD]] has the [[ktrace]] command. With it a processes [[syscall]]s can be traced. By default ktrace writes the file "ktrace.out". To switch off tracing a simple "ktrace -C" is used. To view the contents of the tracefile you would use [[kdump]]. When you need to trace the child of a process the "-i" flag to ktrace is probably best.		[[BSD]] has the [[ktrace]] command. With it a processes [[syscall]]s can be traced. By default ktrace writes the file "ktrace.out". To switch off tracing a simple "ktrace -C" is used. To view the contents of the tracefile you would use [[kdump]]. When you need to trace the child of a process the "-i" flag to ktrace is probably best.
Line 70:		Line 70:
	pbug mplayer 11555 tr /usr 8016941 -rw------- rw 1273886		pbug mplayer 11555 tr /usr 8016941 -rw------- rw 1273886
	...		...


	== Tracing a process with strace (Redhat EL9) ==		== Tracing a process with strace (Redhat EL9) ==

Pbug: desc

2008-02-25T19:43:37Z

desc

← Older revision		Revision as of 12:43, 25 February 2008
Line 1:		Line 1:
			== Description of a process ==

	A process is a program running in a UNIX system. It communicates with the rest of the system or network by means of [[syscall]]s, [[descriptors]] or [[shared memory]]. A process is in [[protected memory]] also called [[virtual memory]] because address locations are translated by the [[kernel]] from the real physical addresses. A process cannot read the memory of another process owned by another user unless both processes share that memory which needs to be set up by both. Interfaces for reading the memory of another process of the same [[uid]] are [[ptrace]] and the /proc [[filesystem]].		A process is a program running in a UNIX system. It communicates with the rest of the system or network by means of [[syscall]]s, [[descriptors]] or [[shared memory]]. A process is in [[protected memory]] also called [[virtual memory]] because address locations are translated by the [[kernel]] from the real physical addresses. A process cannot read the memory of another process owned by another user unless both processes share that memory which needs to be set up by both. Interfaces for reading the memory of another process of the same [[uid]] are [[ptrace]] and the /proc [[filesystem]].

Pbug: /* Tracing a process with strace (Redhat EL9) */

2008-02-25T19:42:32Z

Tracing a process with strace (Redhat EL9)

← Older revision		Revision as of 12:42, 25 February 2008
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	=== Debugging a process that's running ===		== Debugging a process that's running ==

	[[gdb]] allows one to attach to a process. The process should be compiled with debugging symbols (-g flag). The debugger attaches to the process like so:		[[gdb]] allows one to attach to a process. The process should be compiled with debugging symbols (-g flag). The debugger attaches to the process like so:

Pbug: using strace in linux

2008-02-25T19:41:35Z

using strace in linux

← Older revision		Revision as of 12:41, 25 February 2008
Line 68:		Line 68:
	pbug mplayer 11555 tr /usr 8016941 -rw------- rw 1273886		pbug mplayer 11555 tr /usr 8016941 -rw------- rw 1273886
	...		...


			== Tracing a process with strace (Redhat EL9) ==

			[pjp@proteus pjp]$ strace -fo trace.out fire
			pbug, fire started.
			Process 11552 attached

			[pjp@proteus pjp]$ head trace.out
			11551 execve("/home/pjp/bin/fire", ["fire"], [/* 26 vars */]) = 0
			11551 uname({sys="Linux", node="proteus.solarscale.de", ...}) = 0
			11551 brk(0) = 0x804c000
			11551 old_mmap(NULL, 4096, PROT_READ\|PROT_WRITE, MAP_PRIVATE\|MAP_ANONYMOUS, -1, 0) = 0xb7fed000
			11551 open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
			11551 open("/etc/ld.so.cache", O_RDONLY) = 3
			11551 fstat64(3, {st_mode=S_IFREG\|0644, st_size=20916, ...}) = 0
			11551 old_mmap(NULL, 20916, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7fe7000
			11551 close(3) = 0

Hawson: Reverted edits by ReeO7r (Talk); changed back to last version by Franks

2007-07-13T18:49:04Z

Reverted edits by ReeO7r (Talk); changed back to last version by Franks

← Older revision		Revision as of 11:49, 13 July 2007
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[[http://www.psfc.mit.edu/~jinseok/bbse/view.php?id=presentations&no=359 free nextel ringtones]] [[http://news.engin.brown.edu/forums/thread-view.asp?tid=165 vicodin online]] [[http://wc1.worldcrossing.com/WebX/.1de60a01 sagem ringtones]] [[http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=217 punk ringtones]] [[http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=117 order propecia]] [[http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=195 mono ringtones]] [[http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=116 free polyphonic ringtones]] [[http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=96 cheap levitra]] [[http://news.engin.brown.edu/forums/thread-view.asp?tid=224 wwe ringtones]] [[http://wc1.worldcrossing.com/WebX/.1de609f0 lorazepam online]] [[http://news.engin.brown.edu/forums/thread-view.asp?tid=209 samsung ringtones]] [[http://wc1.worldcrossing.com/WebX/.1de60a31 zanaflex online]] A process is a program running in a UNIX system. It communicates with the rest of the system or network by means of [[syscall]]s, [[descriptors]] or [[shared memory]]. A process is in [[protected memory]] also called [[virtual memory]] because address locations are translated by the [[kernel]] from the real physical addresses. A process cannot read the memory of another process owned by another user unless both processes share that memory which needs to be set up by both. Interfaces for reading the memory of another process of the same [[uid]] are [[ptrace]] and the /proc [[filesystem]].		A process is a program running in a UNIX system. It communicates with the rest of the system or network by means of [[syscall]]s, [[descriptors]] or [[shared memory]]. A process is in [[protected memory]] also called [[virtual memory]] because address locations are translated by the [[kernel]] from the real physical addresses. A process cannot read the memory of another process owned by another user unless both processes share that memory which needs to be set up by both. Interfaces for reading the memory of another process of the same [[uid]] are [[ptrace]] and the /proc [[filesystem]].

	A process is created by the [[fork]] [[syscall]] by a parent process. The new process is also called the child. After fork the child retains all memory and [[descriptors]] of its parent.		A process is created by the [[fork]] [[syscall]] by a parent process. The new process is also called the child. After fork the child retains all memory and [[descriptors]] of its parent.