I'm not sure if I understand this correctly but I would like to access the
values after the system call returns.
syscall::stat:entry { /* int stat(const char *restrict path, struct stat
*restrict buf); */
/* where arg0 = const char *restrict path */
/* arg1 = struct stat *restrict buf */
self->arg0 = copyinstr ( arg0 );
self->arg1 = (struct stat *) arg1;
}
syscall::stat:return / self->arg0 != 0 / {
printf ( "%-10d %-10d %-10s: [%-25s:%-10d:%-10d]",
pid,
uid,
execname,
self->arg0,
arg0 == 0 ? self->arg1->st_uid : -1,
arg0 == 0 ? self->arg1->st_gid : -1 );
self->arg0 = 0;
self->arg1 = 0;
}
When :entry fires it should store the pointer to stat buf to be used in the
:return event.
When :return fires I get the following when the return value of 'stat()' is
zero:
dtrace: error on enabled probe ID 2 (ID 4694: syscall::stat:return): invalid
address (0xfcc7bd48) in action #5 at DIF offset 48
What am I doing wrong?
Cheers
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