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Date: Tue, 06 Mar 2012 03:17:00 -0000
Message-ID: <CACeqxwT-v_fXLYdm6+FcCH5E+TSWQifbkY_n=Jnb7hk+xpa5+w@mail.gmail.com>
Subject: problem in User-Space Probing
From: ch huang <justlooks@gmail.com>
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i write a test function ,

#include <stdio.h>

static void my_out(void)
{
        printf("just a test\n");
}
main()
{
        printf("befor function\n");
        my_out();
        printf("after function\n");
}

and compile it
gcc -g -gdwarf-2 -g3  test.c  -o test

then write stap script

probe process("/root/test").function("my_out"){
printf("i in %s\n",pp())
}
probe process("/root/test").function("my_out").return{
printf("back from %s\n",probefunc())
}
when i run this script i find some warning information

# stap exec.stp
/usr/local/share/systemtap/runtime/uprobes/uprobes.c: In function
=91uprobe_report_exec=92:
/usr/local/share/systemtap/runtime/uprobes/uprobes.c:2401: warning:
=91uproc=92 may be used uninitialized in this function
/usr/local/share/systemtap/runtime/uprobes/uprobes.c: In function
=91uprobe_report_exit=92:
/usr/local/share/systemtap/runtime/uprobes/uprobes.c:2101: warning:
=91uproc=92 may be used uninitialized in this function
i in process("/root/test").function("my_out@/root/test.c:4")
back from my_out

it seems script works fine ,but i do not know the warning info,is
there something i missed?