source: trunk/packages/xen-3.1/xen-3.1/tools/xenstore/xenstored_linux.c @ 34

/******************************************************************************
 *
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * 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, version 2 of the
 * License.
 */

#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>

#include "xenstored_core.h"

#define XENSTORED_PROC_KVA  "/proc/xen/xsd_kva"
#define XENSTORED_PROC_PORT "/proc/xen/xsd_port"

evtchn_port_t xenbus_evtchn(void)
{
        int fd;
        int rc;
        evtchn_port_t port; 
        char str[20]; 

        fd = open(XENSTORED_PROC_PORT, O_RDONLY); 
        if (fd == -1)
                return -1;

        rc = read(fd, str, sizeof(str)); 
        if (rc == -1)
        {
                int err = errno;
                close(fd);
                errno = err;
                return -1;
        }

        str[rc] = '\0'; 
        port = strtoul(str, NULL, 0); 

        close(fd); 
        return port;
}

void *xenbus_map(void)
{
        int fd;
        void *addr;

        fd = open(XENSTORED_PROC_KVA, O_RDWR);
        if (fd == -1)
                return NULL;

        addr = mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE,
                MAP_SHARED, fd, 0);

        if (addr == MAP_FAILED)
                addr = NULL;

        close(fd);

        return addr;
}

void xenbus_notify_running(void)
{
}