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https://github.com/xen-project/xen.git
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Ian Jackson
52dd77ed93
This necessitates adding $(CFLAGS_xeninclude) to all the depending libraries (which can be done via Rules.mk), so that the definition of domid_t (in xen.h) can be found. Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* handlreg.c
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*
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* implementation of xentoolcore_restrict_all
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*
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* Copyright (c) 2017 Citrix
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* Part of a generic logging interface used by various dom0 userland libraries.
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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 "xentoolcore_internal.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <assert.h>
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static pthread_mutex_t handles_lock = PTHREAD_MUTEX_INITIALIZER;
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static XENTOOLCORE_LIST_HEAD(, Xentoolcore__Active_Handle) handles;
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static void lock(void) {
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int e = pthread_mutex_lock(&handles_lock);
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assert(!e);
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}
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static void unlock(void) {
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int e = pthread_mutex_unlock(&handles_lock);
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assert(!e);
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}
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void xentoolcore__register_active_handle(Xentoolcore__Active_Handle *ah) {
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lock();
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XENTOOLCORE_LIST_INSERT_HEAD(&handles, ah, entry);
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unlock();
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}
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void xentoolcore__deregister_active_handle(Xentoolcore__Active_Handle *ah) {
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lock();
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XENTOOLCORE_LIST_REMOVE(ah, entry);
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unlock();
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}
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int xentoolcore_restrict_all(domid_t domid) {
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int r;
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Xentoolcore__Active_Handle *ah;
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lock();
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XENTOOLCORE_LIST_FOREACH(ah, &handles, entry) {
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r = ah->restrict_callback(ah, domid);
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if (r) goto out;
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}
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r = 0;
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out:
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unlock();
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return r;
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}
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int xentoolcore__restrict_by_dup2_null(int fd) {
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int nullfd = -1, r;
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if (fd < 0)
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/* just in case */
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return 0;
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nullfd = open("/dev/null", O_RDONLY);
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if (nullfd < 0) goto err;
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r = dup2(nullfd, fd);
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if (r < 0) goto err;
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close(nullfd);
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return 0;
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err:
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if (nullfd >= 0) close(nullfd);
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return -1;
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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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