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Ian Campbell
cf8c4d3d13
By having the "num" argument before the page and error arrays we can
potentially use a variable-length-array argument ("int pages[num]") in
the function prototype.
However VLAs are a C99 feature and we are currently targetting C89 and
later, so we don't actually make use of this here, merely arrange that
we can switch to VLAs in the future without changing the function ABI.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/******************************************************************************
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include "private.h"
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#define PRIVCMD_DEV "/dev/xen/privcmd"
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int osdep_xenforeignmemory_open(xenforeignmemory_handle *fmem)
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{
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int flags, saved_errno;
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int fd = open(PRIVCMD_DEV, O_RDWR);
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if ( fd == -1 )
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{
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PERROR("Could not obtain handle on privileged command interface "
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PRIVCMD_DEV);
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return -1;
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}
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/*
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* Although we return the file handle as the 'xc handle' the API
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* does not specify / guarentee that this integer is in fact
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* a file handle. Thus we must take responsiblity to ensure
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* it doesn't propagate (ie leak) outside the process.
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*/
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if ( (flags = fcntl(fd, F_GETFD)) < 0 )
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{
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PERROR("Could not get file handle flags");
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goto error;
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}
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flags |= FD_CLOEXEC;
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if ( fcntl(fd, F_SETFD, flags) < 0 )
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{
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PERROR("Could not set file handle flags");
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goto error;
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}
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fmem->fd = fd;
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return 0;
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error:
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saved_errno = errno;
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close(fd);
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errno = saved_errno;
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return -1;
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}
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int osdep_xenforeignmemory_close(xenforeignmemory_handle *fmem)
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{
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int fd = fmem->fd;
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if ( fd == -1 )
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return 0;
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return close(fd);
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}
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void *osdep_xenforeignmemory_map(xenforeignmemory_handle *fmem,
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uint32_t dom, int prot,
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size_t num,
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const xen_pfn_t arr[/*num*/], int err[/*num*/])
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{
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int fd = fmem->fd;
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privcmd_mmapbatch_t ioctlx;
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void *addr;
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int rc;
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addr = mmap(NULL, num << PAGE_SHIFT, prot, MAP_SHARED, fd, 0);
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if ( addr == MAP_FAILED )
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{
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PERROR("xc_map_foreign_bulk: mmap failed");
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return NULL;
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}
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ioctlx.num = num;
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ioctlx.dom = dom;
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ioctlx.addr = (unsigned long)addr;
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ioctlx.arr = arr;
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ioctlx.err = err;
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rc = ioctl(fd, IOCTL_PRIVCMD_MMAPBATCH, &ioctlx);
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if ( rc < 0 )
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{
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int saved_errno = errno;
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PERROR("xc_map_foreign_bulk: ioctl failed");
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(void)munmap(addr, num << PAGE_SHIFT);
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errno = saved_errno;
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return NULL;
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}
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return addr;
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}
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int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
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void *addr, size_t num)
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{
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return munmap(addr, num << PAGE_SHIFT);
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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