How to create core through program at the time of crash by handling signals? Post: 302740833

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Operating Systems Solaris How to create core through program at the time of crash by handling signals? Post 302740833 by rajeev_ks on Friday 7th of December 2012 12:04:56 AM

Old

12-07-2012

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Quote:

Originally Posted by jim mcnamara

The simple way to get a core that "starts" at the fault is not to block signals. Obviously this has some very bad downsides.

Otherwise with what you have done you have to traverse stack frames back to the problem, in gdb this is the

Code:

backtrace

command. Signal receipt when blocked causes an immediate interrupt to the executing code, pushing the state of the process and kernel onto the interrupt stack. Working backwards can be fun.

Some example code for gaddr2line():

Note that you should consider libelf instead of the python library.

I am using dbx for debugging core and the corresponding command for backtrace is where in dbx. But as I said earlier I am getting the stack of signal handler routine through backtrace and not the location of faulty code.

rajeev_ks

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LEARN ABOUT HPUX

gcore

gcore(1)						      General Commands Manual							  gcore(1)

NAME

       gcore - get core images of running processes

SYNOPSIS

       filename] process-id...

DESCRIPTION

       The command creates a core image of each specified process.  By default, the name of the core image file for process-id will be The process
       information in the core file can be obtained by using debuggers.

       When the command creates a core image of each specified process, the process is temporarily stopped.  Further, when the	creation  of  core
       image is complete, the process continues to execute.

   Options
       Creates the core file with name of the file as
		      If multiple process-id values are specified, filename will be common for all the core image files.  See the section.

   Operands
       process-id     The process ID for which a core image file will be created.

RETURN VALUE

       Upon completion, exits with one of the following values:

	      A core file was successfully created.

	      An error condition was encountered.
		     In such a case, the creation of a core file is not guaranteed.  The error conditions could be because of

		     o	A nonexistent or incorrect process ID was specified.

		     o	An invalid option was specified.

		     o	The current working directory of the process or directory from which was invoked had no write permissions.

		     o	The current working directory of the process was not accessible.

		     o	The file system is full.

EXAMPLES

   Example 1
       Dump the core image of process 1030 in the file "core.1030".

   Example 2
       Dump the core image of the process 1030 in the file "test.1030".

   Example 3
       Dump the core image of the processes 1030, 1031, 1032, and 1033 in the files "core.1030", "core.1031", "core.1032", "core.1033".

   Example 4
       Dump the core image of the processes 1030, 1031, 1032, and 1033 in the files

FILES

       Core image file for process-id.	(Both where is invoked and the current working directory of the process.)

AUTHOR

       was developed by Chris Bertin (HP).

SEE ALSO

       adb(1), gdb(1), kill(1), ttrace(2), a.out(4), core(4).

																	  gcore(1)