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Full Discussion: How to create core through program at the time of crash by handling signals?
Operating Systems Solaris How to create core through program at the time of crash by handling signals? Post 302739997 by rajeev_ks on Wednesday 5th of December 2012 10:00:37 AM
Old 12-05-2012
How to create core through program at the time of crash by handling signals?
I am in process of writing a library which can make any application of my product capable of creating core in the application's log folder with a product friendly core file name programatically. In my library I am registering for certain signals e.g. SIGILL, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGABRT and in the handler routine of my signal I am forking gcore to create dump of the current process.

I am able to successfully create the core in this manner if any application which uses my library runs a faulty code e.g. Illegal Memory Access (Segmentation Violation) etc. However the core created in this manner does not take me to the faulty code location and displays the Signal Handler routine stack.

On windows this can be done through registering handler by calling SetUnhandledExceptionFilter. When OS calls the handler in case of any unhandled exception it also passes _EXCEPTION_POINTERS which is used for dump creation. The dump created in this manner contains the correct information of faulty code.

Through Solaris signal handling I am only getting signal number in the handler routine. How can create correct core in the given situation on AIX programatically. Forking gcore is not working here as correct core is not getting generated. If any sample program is available then that would be great.

I am using Solaris 10.
Last edited by rajeev_ks; 12-06-2012 at 12:11 PM..
 

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LEARN ABOUT FREEBSD

crashinfo

CRASHINFO(8)						    BSD System Manager's Manual 					      CRASHINFO(8)

NAME

     crashinfo -- analyze a core dump of the operating system

SYNOPSIS

     crashinfo [-d crashdir] [-n dumpnr] [-k kernel] [core]

DESCRIPTION

     The crashinfo utility analyzes a core dump saved by savecore(8).  It generates a text file containing the analysis in the same directory as
     the core dump.  For a given core dump file named vmcore.XX the generated text file will be named core.txt.XX.

     By default, crashinfo analyzes the most recent core dump in the core dump directory.  A specific core dump may be specified via either the
     core or dumpnr arguments.	Once crashinfo has located a core dump, it analyzes the core dump to determine the exact version of the kernel
     that generated the core.  It then looks for a matching kernel file under each of the subdirectories in /boot.  The location of the kernel
     file can also be explicitly provided via the kernel argument.

     Once crashinfo has located a core dump and kernel, it uses several utilities to analyze the core including dmesg(8), fstat(1), iostat(8),
     ipcs(1), kgdb(1), netstat(1), nfsstat(1), ps(1), pstat(8), and vmstat(8).

     The options are as follows:

     -d crashdir
	     Specify an alternate core dump directory.	The default crash dump directory is /var/crash.

     -n dumpnr
	     Use the core dump saved in vmcore.dumpnr instead of the latest core in the core dump directory.

     -k kernel
	     Specify an explicit kernel file.

SEE ALSO

     textdump(4), savecore(8)

HISTORY

     The crashinfo utility appeared in FreeBSD 6.4.

BSD
								   June 28, 2008							       BSD
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