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libvirt-lxc: add virDomainLxcEnterCGroup API

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Add the virDomainLxcEnterCGroup API to the libvirt-lxc.so
file. This method moves the calling process into the cgroups
associated with the container.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-04-14 15:16:22 +01:00
parent 235620463c
commit 57e62ee00a
5 changed files with 60 additions and 0 deletions
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2
config-post.h
View File

@ -32,6 +32,7 @@
# undef HAVE_LIBSASL2
# undef WITH_CAPNG
# undef WITH_CURL
# undef WITH_DBUS
# undef WITH_DTRACE_PROBES
# undef WITH_GNUTLS
# undef WITH_GNUTLS_GCRYPT
@ -39,6 +40,7 @@
# undef WITH_NUMACTL
# undef WITH_SASL
# undef WITH_SSH2
# undef WITH_SYSTEMD_DAEMON
# undef WITH_VIRTUALPORT
# undef WITH_YAJL
# undef WITH_YAJL2

2
include/libvirt/libvirt-lxc.h
View File

@ -46,6 +46,8 @@ int virDomainLxcEnterSecurityLabel(virSecurityModelPtr model,
virSecurityLabelPtr label,
virSecurityLabelPtr oldlabel,
unsigned int flags);
int virDomainLxcEnterCGroup(virDomainPtr domain,
unsigned int flags);
# ifdef __cplusplus
}

4
src/Makefile.am
View File

@ -2327,8 +2327,10 @@ libvirt_setuid_rpc_client_la_SOURCES = \
util/viratomic.h \
util/virbitmap.c \
util/virbuffer.c \
util/vircgroup.c \
util/vircommand.c \
util/virconf.c \
util/virdbus.c \
util/virerror.c \
util/virevent.c \
util/vireventpoll.c \
@ -2336,6 +2338,7 @@ libvirt_setuid_rpc_client_la_SOURCES = \
util/virgettext.c \
util/virhash.c \
util/virhashcode.c \
util/virhostcpu.c \
util/virjson.c \
util/virlog.c \
util/virobject.c \
@ -2344,6 +2347,7 @@ libvirt_setuid_rpc_client_la_SOURCES = \
util/virrandom.c \
util/virsocketaddr.c \
util/virstring.c \
util/virsystemd.c \
util/virtime.c \
util/virthread.c \
util/virthreadjob.c \

47
src/libvirt-lxc.c
View File

@ -36,6 +36,7 @@
#ifdef WITH_APPARMOR
# include <sys/apparmor.h>
#endif
#include "vircgroup.h"
#define VIR_FROM_THIS VIR_FROM_NONE
@ -269,3 +270,49 @@ virDomainLxcEnterSecurityLabel(virSecurityModelPtr model,
virDispatchError(NULL);
return -1;
}
/**
* virDomainLxcEnterCGroup:
* @domain: a domain object
* @flags: currently unused, pass 0
*
* This API is LXC specific, so it will only work with hypervisor
* connections to the LXC driver.
*
* Attaches the process to the control cgroups associated
* with the container @domain.
*
* Returns 0 on success, -1 on error
*/
int virDomainLxcEnterCGroup(virDomainPtr domain,
unsigned int flags)
{
virConnectPtr conn;
virCgroupPtr cgroup = NULL;
VIR_DOMAIN_DEBUG(domain, "flags=%x", flags);
virResetLastError();
virCheckDomainReturn(domain, -1);
conn = domain->conn;
virCheckReadOnlyGoto(conn->flags, error);
virCheckFlagsGoto(0, error);
if (virCgroupNewDetect(domain->id, -1, &cgroup) < 0)
goto error;
if (virCgroupAddTask(cgroup, getpid()) < 0)
goto error;
virCgroupFree(&cgroup);
return 0;
error:
virDispatchError(NULL);
virCgroupFree(&cgroup);
return -1;
}

5
src/libvirt_lxc.syms
View File

@ -20,3 +20,8 @@ LIBVIRT_LXC_1.0.4 {
global:
virDomainLxcEnterSecurityLabel;
} LIBVIRT_LXC_1.0.2;
LIBVIRT_LXC_1.3.6 {
global:
virDomainLxcEnterCGroup;
} LIBVIRT_LXC_1.0.4;