Hi dtrace users,
even as a dtrace beginner, I was quite successful putting a dtrace
script together to help me debug a wierd file descriptor issue on Mac
OS X 10.5.5 -- I was able to get all the necessary debugging
information from syscalls like open, dup, dup2, fork, write and many
more, just with pipe I got no idea on how to output both of the file
descriptors returned using dtrace.
With pipe being defined as follows
int pipe(int *fildes);
actually returning the two file descriptors as fildes[0] and
fildes[1], I always get fildes[0] in arg0 (and arg1) inside
syscall::pipe:return. But where is fildes[1]? I thought I'd probably
need to get the pointer and then use copyin() -- but I just can't
figure out how...
syscall::pipe:entry
{
/* Any possibility to get a pointer here already to be assigned to
self->something to help me in "return"? */
}
syscall::pipe:return
{
printf("pipe(%d, %d)\n", arg0, arg1 /* <- How to get the second
file descriptor? */);
}
Any help is appreciated!
Thanks,
Beat
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