IBM AIX Continuous Availability Features - IBM Redbooks

}
return 0;
}else{
printf("[%s] not loaded with ERROR=%d\n",g_binpath,errno);
return 1;
}
}
if (!(strcmp("--unload",*(argv+1)))){
ADD_LIBPATH();
if (sysconfig(SYS_QUERYLOAD, &g_cfg_load, sizeof(struct \\
cfg_load))||g_cfg_load.kmid){
printf("[%s] found with mid=[%d]\n",g_binpath,g_cfg_load.kmid);
/*
* Unloaded the loaded kernel extension
*/
if (sysconfig(SYS_KULOAD, &g_cfg_load, sizeof(struct cfg_load))== 0){
printf("[%s] unloaded successfully\n",g_binpath);
return 0;
}else{
printf("[%s] not unloaded with error=[%d]\n",g_binpath,errno);
return 1;
}
}else{
printf("[%s] currently not loaded, nothing to unload\n",g_binpath);
return 1;
}
}
/*
* Invalid second Argument
*/
printf("Usage: service --load|--unload Kernel_Entension [Libpath]\n");
return 1;
Try to load the kernel extension and call it first with a protection gate, and then without an
appropriate protection gate (that is, without KKEY_VMM) by using KKEY_VMM.
Note: The second iteration will cause the kernel to crash.
To view the output of the kernel extension (system call), you need console access. All output
will go to the hardware console when you use printf() in kernel mode. Compile the program
using the command shown in Example 3-26.
Example 3-26 Compile the program
# make
/usr/vac/bin/cc -q64 -o myprog myprog.c -bI:kkey_set.exp
/usr/vac/bin/cc -o service service.c
/usr/vac/bin/cc -q64 -D_KERNEL -D_KERNSYS -D_64BIT_KERNEL -D__64BIT__ -o
kkey_set64.o -c kkey_set.c
"kkey_set.c": 1506-312 (W) Compiler internal name __64BIT__ has been defined as a
macro.
ld -b64 -o kkey_set64 kkey_set64.o -e kkey_test_init -bE:kkey_set.exp
-bI:/usr/lib/kernex.exp -lcsys
Target "all" is up to date.
Chapter 3. AIX advanced continuous availability tools and features 95