mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 18:50:05 +01:00
Keir Fraser
5cc436c1d2
This patch eliminate the global variables in libxenctrl (used for logging and error reporting). Instead the information which was in the global variables is now in a new xc_interface* opaque structure, which xc_interface open returns instead of the raw file descriptor; furthermore, logging is done via xentoollog. There are three new parameters to xc_interface_open to control the logging, but existing callers can just pass "0" for all three to get the old behaviour. All libxc callers have been adjusted accordingly. Also update QEMU_TAG for corresponding qemu change. Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of
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* this archive for more details.
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*/
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#include "xc_private.h"
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#include "xenguest.h"
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#define SUSPEND_LOCK_FILE "/var/lib/xen/suspend_evtchn"
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static int lock_suspend_event(xc_interface *xch, int domid)
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{
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int fd, rc;
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mode_t mask;
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char buf[128];
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char suspend_file[256];
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snprintf(suspend_file, sizeof(suspend_file), "%s_%d_lock.d",
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SUSPEND_LOCK_FILE, domid);
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mask = umask(022);
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fd = open(suspend_file, O_CREAT | O_EXCL | O_RDWR, 0666);
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if (fd < 0)
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{
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ERROR("Can't create lock file for suspend event channel %s\n",
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suspend_file);
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return -EINVAL;
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}
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umask(mask);
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snprintf(buf, sizeof(buf), "%10ld", (long)getpid());
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rc = write_exact(fd, buf, strlen(buf));
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close(fd);
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return rc;
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}
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static int unlock_suspend_event(xc_interface *xch, int domid)
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{
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int fd, pid, n;
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char buf[128];
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char suspend_file[256];
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snprintf(suspend_file, sizeof(suspend_file), "%s_%d_lock.d",
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SUSPEND_LOCK_FILE, domid);
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fd = open(suspend_file, O_RDWR);
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if (fd < 0)
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return -EINVAL;
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n = read(fd, buf, 127);
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close(fd);
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if (n > 0)
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{
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sscanf(buf, "%d", &pid);
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/* We are the owner, so we can simply delete the file */
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if (pid == getpid())
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{
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unlink(suspend_file);
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return 0;
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}
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}
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return -EPERM;
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}
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int xc_await_suspend(xc_interface *xch, int xce, int suspend_evtchn)
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{
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int rc;
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do {
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rc = xc_evtchn_pending(xce);
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if (rc < 0) {
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ERROR("error polling suspend notification channel: %d", rc);
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return -1;
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}
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} while (rc != suspend_evtchn);
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/* harmless for one-off suspend */
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if (xc_evtchn_unmask(xce, suspend_evtchn) < 0)
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ERROR("failed to unmask suspend notification channel: %d", rc);
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return 0;
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}
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int xc_suspend_evtchn_release(xc_interface *xch, int xce, int domid, int suspend_evtchn)
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{
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if (suspend_evtchn >= 0)
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xc_evtchn_unbind(xce, suspend_evtchn);
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return unlock_suspend_event(xch, domid);
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}
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int xc_suspend_evtchn_init(xc_interface *xch, int xce, int domid, int port)
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{
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int rc, suspend_evtchn = -1;
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if (lock_suspend_event(xch, domid))
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return -EINVAL;
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suspend_evtchn = xc_evtchn_bind_interdomain(xce, domid, port);
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if (suspend_evtchn < 0) {
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ERROR("failed to bind suspend event channel: %d", suspend_evtchn);
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goto cleanup;
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}
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rc = xc_domain_subscribe_for_suspend(xch, domid, port);
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if (rc < 0) {
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ERROR("failed to subscribe to domain: %d", rc);
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goto cleanup;
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}
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/* event channel is pending immediately after binding */
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xc_await_suspend(xch, xce, suspend_evtchn);
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return suspend_evtchn;
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cleanup:
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if (suspend_evtchn != -1)
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xc_suspend_evtchn_release(xch, xce, domid, suspend_evtchn);
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return -1;
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}
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