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Operating Systems HP-UX Memory Fault with Lawson Install Post 48397 by Perderabo on Friday 5th of March 2004 12:32:32 PM
Old 03-05-2004
Here is a quick program:
Code:
#ifdef __STDC__
#define PROTOTYPICAL
#endif
#ifdef __cplusplus
#define PROTOTYPICAL
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>


#ifdef PROTOTYPICAL
int main(int argc, char *argv[])
#else
main(argc,argv)
char *argv[];
#endif
{
        char *p;
        brk(&p);
        *--p=1;
        exit(0);
}

It is specific to HP-UX. But copy that code into a file called memoryfault.c. Compile it with:
cc memoryfault.c -o memoryfault
and run it with:
./memoryfault

It will generate a memory fault. This is because it attempted a illegal sequence of operations. Adding memory or swap to your box will not fix my program. My program is broken. That's what a memory fault is.

A "memory fault" might be called a "segmentation fault" on another OS. Or even another shell. But the signal SIGSEGV was sent to process by the kernel. The shell detects this and displays the "memory fault" message.

Basicly the program attempted to write into a place that was not a writable memory segment. Your program might be doing that. Or it might be attempting a read from a location that is not in a readable memory segment.

But clearly, the program has a bug and it almost certainly involves referencing a pointer with an invalid value. And the author of the program is going to need to fix that.
 

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fmd(1M) 						  System Administration Commands						   fmd(1M)

NAME
fmd - fault manager daemon SYNOPSIS
/usr/lib/fm/fmd/fmd [-V] [-f file] [-o opt=val] [-R dir] DESCRIPTION
fmd is a daemon that runs in the background on each Solaris system. fmd receives telemetry information relating to problems detected by the system software, diagnoses these problems, and initiates proactive self-healing activities such as disabling faulty components. When appropriate, the fault manager also sends a message to the syslogd(1M) service to notify an administrator that a problem has been detected. The message directs administrators to a knowledge article on Sun's web site, http://www.sun.com/msg/, which explains more about the problem impact and appropriate responses. Each problem diagnosed by the fault manager is assigned a Universal Unique Identifier (UUID). The UUID uniquely identifes this particular problem across any set of systems. The fmdump(1M) utility can be used to view the list of problems diagnosed by the fault manager, along with their UUIDs and knowledge article message identifiers. The fmadm(1M) utility can be used to view the resources on the system believed to be faulty. The fmstat(1M) utility can be used to report statistics kept by the fault manager. The fault manager is started automatically when Solaris boots, so it is not necessary to use the fmd command directly. Sun's web site explains more about what capabilities are cur- rently available for the fault manager on Solaris. OPTIONS
The following options are supported -f file Read the specified configuration file prior to searching for any of the default fault manager configuration files. -o opt=value Set the specified fault manager option to the specified value. Fault manager options are currently a Private inter- face; see attributes(5) for information about Private interfaces. -R dir Use the specified root directory for all pathnames evaluated by the fault manager, instead of the default root (/). -V Print the fault manager's version to stdout and exit. EXIT STATUS
The following exit values are returned: 0 Successful completion 1 An error occurred which prevented the fault manager from initializing, such as failure to open the telemetry trans- port. 2 Invalid command-line options were specified. FILES
/etc/fm/fmd Fault manager configuration directory /usr/lib/fm/fmd Fault manager library directory /var/fm/fmd Fault manager log directory ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWfmd | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
svcs(1), fmadm(1M), fmdump(1M), fmstat(1M), syslogd(1M), attributes(5), smf(5) http://www.sun.com/msg/ NOTES
The Fault Manager is managed by the service management facility, smf(5), under the service identifier: svc:/system/fmd:default The service's status can be queried using the svcs(1) command. Administrators should not disable the Fault Manager service. SunOS 5.10 17 Nov 2004 fmd(1M)
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