mirror of
https://github.com/xen-project/xen.git
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Ian Campbell
d322b7f4c2
"tools/libs/*: Use O_CLOEXEC on Linux and FreeBSD" left some dead code in the FreeBSD case, which breaks the build on that platform. Also fix a typo "uint_32". Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
119 lines
2.8 KiB
C
119 lines
2.8 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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* Split from xc_freebsd_osdep.c
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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_xencall_open(xencall_handle *xcall)
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{
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int fd = open(PRIVCMD_DEV, O_RDWR|O_CLOEXEC);
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/*
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* This file descriptor is opaque to the caller, thus we are
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* polite and try and ensure it doesn't propagate (ie leak)
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* outside the process, by using O_CLOEXEC.
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*/
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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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xcall->fd = fd;
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return 0;
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}
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int osdep_xencall_close(xencall_handle *xcall)
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{
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int fd = xcall->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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int osdep_hypercall(xencall_handle *xcall, privcmd_hypercall_t *hypercall)
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{
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int fd = xcall->fd;
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int ret;
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ret = ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, hypercall);
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return (ret == 0) ? hypercall->retval : ret;
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}
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void *osdep_alloc_pages(xencall_handle *xcall, size_t npages)
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{
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size_t size = npages * PAGE_SIZE;
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void *p;
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/* Address returned by mmap is page aligned. */
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p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
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-1, 0);
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if (p == NULL)
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return NULL;
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/*
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* Since FreeBSD doesn't have the MAP_LOCKED flag,
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* lock memory using mlock.
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*/
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if ( mlock(p, size) < 0 )
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{
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munmap(p, size);
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return NULL;
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}
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return p;
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}
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void osdep_free_pages(xencall_handle *xcall, void *ptr, size_t npages)
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{
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int saved_errno = errno;
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/* Unlock pages */
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munlock(ptr, npages * PAGE_SIZE);
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munmap(ptr, npages * PAGE_SIZE);
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/* We MUST propagate the hypercall errno, not unmap call's. */
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errno = saved_errno;
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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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