It's not obvious to me... looks like it should work. Did you verify
that the memory at tbuf.bufPtr has the right values before the copyOut?
There may be something subtle in the way operator[] is overloaded on
TypedBufferArg.
Jeff wrote:
Hi,
I'm trying to implement the pipe system call in ALPHA_SE mode, by just calling
pipe natively and writing the file descriptors into the array passed in by
address.
this is the code snippet showing how i'm doing it. for some reason, the values
in memory aren't being updated correctly and the pipe-caller sees the wrong
values in the file descriptor array. is there something obvious that i'm
missing here?
thanks, i really appreciate help with this... i've been stuck on it for the
past couple days and am getting nowhere.
/// Target pipe() function.
template <class OS>
SyscallReturn
pipeFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
TypedBufferArg<int> tbuf(xc->getSyscallArg(0), 8);
int fds[2];
int pipe_retval = pipe(fds);
tbuf[0] = process->open_fd(fds[0]);
tbuf[1] = process->open_fd(fds[1]);
tbuf.copyOut(xc->mem);
return pipe_retval;
}
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