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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* Copyright (c) 2008, XenSource Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of XenSource Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include "tap-ctl.h"
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#include "blktap2.h"
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int
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tap_ctl_check_blktap(const char **msg)
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{
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FILE *f;
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int err = 0, minor;
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char name[32];
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memset(name, 0, sizeof(name));
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f = fopen("/proc/misc", "r");
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if (!f) {
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*msg = "failed to open /proc/misc";
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return -errno;
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}
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while (fscanf(f, "%d %32s", &minor, name) == 2) {
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if (!strcmp(name, BLKTAP2_CONTROL_NAME))
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goto out;
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}
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err = -ENOSYS;
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*msg = "blktap kernel module not installed";
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out:
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fclose(f);
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return err;
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}
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int
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tap_ctl_check(const char **msg)
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{
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int err;
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uid_t uid;
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err = tap_ctl_check_blktap(msg);
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if (err)
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goto out;
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err = 0;
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*msg = "ok";
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out:
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return err;
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}
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