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/*
Fake libxc which doesn't require hypervisor but talks to xs_test.
Copyright (C) 2005 Rusty Russell IBM Corporation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include "utils.h"
#include "xenstored_core.h"
#include "xenstored_domain.h"
#include "xenstored_test.h"
static int sigfd;
static int xs_test_pid;
static u16 port;
/* The event channel maps to a signal, shared page to an mmapped file. */
int xc_evtchn_send(int xc_handle __attribute__((unused)), int local_port)
{
assert(local_port == port);
if (kill(xs_test_pid, SIGUSR2) != 0)
barf_perror("fake event channel failed");
return 0;
}
void *xc_map_foreign_range(int xc_handle, u32 dom __attribute__((unused)),
int size, int prot,
unsigned long mfn __attribute__((unused)))
{
void *ret;
ret = mmap(NULL, size, prot, MAP_SHARED, xc_handle, 0);
if (ret == MAP_FAILED)
return NULL;
/* xs_test tells us pid and port by putting it in buffer, we reply. */
xs_test_pid = *(int *)(ret + 32);
port = *(int *)(ret + 36);
*(int *)(ret + 32) = getpid();
return ret;
}
int xc_interface_open(void)
{
int fd;
char page[getpagesize()];
fd = open("/tmp/xcmap", O_RDWR|O_CREAT|O_TRUNC, 0600);
if (fd < 0)
return fd;
memset(page, 0, sizeof(page));
if (!xs_write_all(fd, page, sizeof(page)))
barf_perror("Failed to write /tmp/xcmap page");
return fd;
}
int xc_interface_close(int xc_handle)
{
close(xc_handle);
return 0;
}
static void send_to_fd(int signo __attribute__((unused)))
{
int saved_errno = errno;
write(sigfd, &port, sizeof(port));
errno = saved_errno;
}
void fake_block_events(void)
{
signal(SIGUSR2, SIG_IGN);
}
void fake_ack_event(void)
{
signal(SIGUSR2, send_to_fd);
}
int fake_open_eventchn(void)
{
int fds[2];
if (pipe(fds) != 0)
return -1;
if (signal(SIGUSR2, send_to_fd) == SIG_ERR) {
int saved_errno = errno;
close(fds[0]);
close(fds[1]);
errno = saved_errno;
return -1;
}
sigfd = fds[1];
return fds[0];
}
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