--- /dev/null
+/*
+ * virinitctl.c: API for talking to init systems via initctl
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#include <config.h>
+
+#include <sys/param.h>
+#include <fcntl.h>
+
+#include "internal.h"
+#include "virinitctl.h"
+#include "virterror_internal.h"
+#include "util.h"
+#include "memory.h"
+#include "virfile.h"
+
+#define VIR_FROM_THIS VIR_FROM_INITCTL
+
+/* These constants & struct definitions are taken from
+ * systemd, under terms of LGPLv2+
+ *
+ * initreq.h Interface to talk to init through /dev/initctl.
+ *
+ * Copyright (C) 1995-2004 Miquel van Smoorenburg
+ */
+
+#if defined(__FreeBSD_kernel__)
+# define VIR_INITCTL_FIFO "/etc/.initctl"
+#else
+# define VIR_INITCTL_FIFO "/dev/initctl"
+#endif
+
+#define VIR_INITCTL_MAGIC 0x03091969
+#define VIR_INITCTL_CMD_START 0
+#define VIR_INITCTL_CMD_RUNLVL 1
+#define VIR_INITCTL_CMD_POWERFAIL 2
+#define VIR_INITCTL_CMD_POWERFAILNOW 3
+#define VIR_INITCTL_CMD_POWEROK 4
+#define VIR_INITCTL_CMD_BSD 5
+#define VIR_INITCTL_CMD_SETENV 6
+#define VIR_INITCTL_CMD_UNSETENV 7
+
+#define VIR_INITCTL_CMD_CHANGECONS 12345
+
+#ifdef MAXHOSTNAMELEN
+# define VIR_INITCTL_RQ_HLEN MAXHOSTNAMELEN
+#else
+# define VIR_INITCTL_RQ_HLEN 64
+#endif
+
+/*
+* This is what BSD 4.4 uses when talking to init.
+* Linux doesn't use this right now.
+*/
+struct virInitctlRequestBSD {
+ char gen_id[8]; /* Beats me.. telnetd uses "fe" */
+ char tty_id[16]; /* Tty name minus /dev/tty */
+ char host[VIR_INITCTL_RQ_HLEN]; /* Hostname */
+ char term_type[16]; /* Terminal type */
+ int signal; /* Signal to send */
+ int pid_value; /* Process to send to */
+ char exec_name[128]; /* Program to execute */
+ char reserved[128]; /* For future expansion. */
+};
+
+
+/*
+ * Because of legacy interfaces, "runlevel" and "sleeptime"
+ * aren't in a separate struct in the union.
+ *
+ * The weird sizes are because init expects the whole
+ * struct to be 384 bytes.
+ */
+struct virInitctlRequest {
+ int magic; /* Magic number */
+ int cmd; /* What kind of request */
+ int runlevel; /* Runlevel to change to */
+ int sleeptime; /* Time between TERM and KILL */
+ union {
+ struct virInitctlRequestBSD bsd;
+ char data[368];
+ } i;
+};
+
+verify(sizeof(struct virInitctlRequest) == 384);
+
+/*
+ * Send a message to init to change the runlevel
+ *
+ * Returns 1 on success, 0 if initctl does not exist, -1 on error
+ */
+int virInitctlSetRunLevel(virInitctlRunLevel level,
+ const char *vroot)
+{
+ struct virInitctlRequest req;
+ int fd = -1;
+ char *path = NULL;
+ int ret = -1;
+
+ memset(&req, 0, sizeof(req));
+
+ req.magic = VIR_INITCTL_MAGIC;
+ req.sleeptime = 0;
+ req.cmd = VIR_INITCTL_CMD_RUNLVL;
+ /* Yes it is an 'int' field, but wants a numeric character. Go figure */
+ req.runlevel = '0' + level;
+
+ if (vroot) {
+ if (virAsprintf(&path, "%s/%s", vroot, VIR_INITCTL_FIFO) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+ } else {
+ if (!(path = strdup(VIR_INITCTL_FIFO))) {
+ virReportOOMError();
+ return -1;
+ }
+ }
+
+ if ((fd = open(path, O_WRONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY)) < 0) {
+ if (errno == ENOENT) {
+ ret = 0;
+ goto cleanup;
+ }
+ virReportSystemError(errno,
+ _("Cannot open init control %s"),
+ path);
+ goto cleanup;
+ }
+
+ if (safewrite(fd, &req, sizeof(req)) != sizeof(req)) {
+ virReportSystemError(errno,
+ _("Failed to send request to init control %s"),
+ path);
+ goto cleanup;
+ }
+
+ ret = 1;
+
+cleanup:
+ VIR_FREE(path);
+ VIR_FORCE_CLOSE(fd);
+ return ret;
+}
--- /dev/null
+/*
+ * virinitctl.h: API for talking to init systems via initctl
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#ifndef __VIR_INITCTL_H__
+# define __VIR_INITCTL_H__
+
+typedef enum virInitctlRunLevel virInitctlRunLevel;
+enum virInitctlRunLevel {
+ VIR_INITCTL_RUNLEVEL_POWEROFF = 0,
+ VIR_INITCTL_RUNLEVEL_1 = 1,
+ VIR_INITCTL_RUNLEVEL_2 = 2,
+ VIR_INITCTL_RUNLEVEL_3 = 3,
+ VIR_INITCTL_RUNLEVEL_4 = 4,
+ VIR_INITCTL_RUNLEVEL_5 = 5,
+ VIR_INITCTL_RUNLEVEL_REBOOT = 6,
+
+ VIR_INITCTL_RUNLEVEL_LAST
+};
+
+int virInitctlSetRunLevel(virInitctlRunLevel level,
+ const char *vroot);
+
+#endif
projects / thirdparty / libvirt.git / commitdiff
