IBM AIX Continuous Availability Features - IBM Redbooks

{
int count;
count = count +1;
printf("printf called %d times\n",count);
}
@@uft:$1:*:sleep:entry
{
int count1;
count1 = count1 +1;
printf("sleep called %d times\n",count1);
}
@@syscall:*:read:exit
when (__pid == $1)
{
printf("read entered\n");
}
@@syscall:*:read:entry
when (__pid == $1)
{
printf("read exited\n");
}
@@END
{
printf("Tracing ends now\n");
}
4. We execute the pvue.e script with the probevue command passing the process ID to be
traced as parameter:
# probevue ./pvue.e 262272
We obtain the tracing output shown in Example 3-40.
Example 3-40 Start Vue script providing pid
# ./pvue.e 262272
Tracing starts now
printf called 1 times
sleep called 1 times
printf called 2 times
/*
* Although the sleep precedes the printf in the loop, the reason we got the printf
in the trace was because the program was in the middle of the first sleep when we
started tracing it, and so the first thing we traced was the subsequent printf.
*/
sleep called 2 times
printf called 3 times
sleep called 3 times
printf called 4 times
sleep called 4 times
printf called 5 times
sleep called 5 times
read exited
read entered
printf called 6 times
^CTracing ends now
#
120 IBM AIX Continuous Availability Features