Date: Wed, 24 Jul 2013 11:13:20 -0700 From: Yuri <yuri@rawbw.com> To: FreeBSD Hackers <hackers@freebsd.org> Subject: DTrace copyin with struct doesn't work? Message-ID: <51F01940.2020402@rawbw.com>
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This simple .d script fails:
---script begin---
#!/usr/sbin/dtrace -s
struct my_args {
int ii;
};
fbt::sys_select:entry
{
printf("sys_select %i", ((struct my_args*)copyin(arg1, sizeof (struct
my_args)))->ii);
}
---script end---
dtrace: error on enabled probe ID 1 (ID 33598:
fbt:kernel:sys_select:entry): invalid address (0xffffff82ff0799d8) in
action #1 at DIF offset 40
dtrace: error on enabled probe ID 1 (ID 33598:
fbt:kernel:sys_select:entry): invalid address (0xffffff82fefb19d8) in
action #1 at DIF offset 40
Function sys_select is defined in kern/sys_generic.c:
int
sys_select(struct thread *td, struct select_args *uap)
arg1 in DTrace script should correspond to uap argument of sys_select,
and dereferencing should always produce an int.
Yuri
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