IBM AIX Continuous Availability Features - IBM Redbooks

* will result in error out of read()->entry()
*/
__auto int auto_var;
}
thread_var=__arg1;
global_var=get_userstring(__arg2,15);
global_var1=__arg3;
printf("At read()->entry():\n");
printf("\tfile descriptor ====>%d\n", thread_var);
printf("\tfile context (15 bytes)====>%s\n", global_var);
printf("\tMAX buffer size ====>%d\n", global_var1);
/* Valid built-in variables : __pid, __rv
* __arg1, __arg2 and __arg2 are not valid here, they are valid only in
* read()->entry()
*/
@@syscall:*:read:exit
when ( __pid == $1 )
{
printf("At read()->exit(): bytes read=%d by read(%d, %s, %d)\n",__rv,
thread_var, global_var, global_var1);
}
@@END
{
/*
* auto_var not accessible here as its an Automatic variable in clause
"read:entry"
*/
printf("\nthread_var=%d global_var=%s global_var1=%d\n", thread_var,
global_var, global_var1);
}
Example 3-42 displays the C file that will be traced using the Vue script.
Example 3-42 Sample C program to be traced
#include
main()
{
int x,rc,fd;
int buff[4096];
for (x=0; x