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/*\
* Copyright (C) International Business Machines Corp., 2005
* Author(s): Anthony Liguori <aliguori@us.ibm.com>
*
* Xen Console Daemon
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; under version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <getopt.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string.h>
#include <signal.h>
#include "xenctrl.h"
#include "utils.h"
struct xs_handle *xs;
xc_interface *xc;
static void child_exit(int sig)
{
while (waitpid(-1, NULL, WNOHANG) > 0);
}
void daemonize(const char *pidfile)
{
pid_t pid;
int fd;
int len;
int i;
char buf[100];
if (getppid() == 1) {
return;
}
if ((pid = fork()) > 0) {
exit(0);
} else if (pid == -1) {
err(errno, "fork() failed");
}
setsid();
if ((pid = fork()) > 0) {
exit(0);
} else if (pid == -1) {
err(errno, "fork() failed");
}
/* redirect fd 0,1,2 to /dev/null */
if ((fd = open("/dev/null",O_RDWR)) == -1) {
exit(1);
}
for (i = 0; i <= 2; i++) {
close(i);
dup2(fd, i);
}
close(fd);
umask(027);
if (chdir("/") < 0)
exit (1);
fd = open(pidfile, O_RDWR | O_CREAT, S_IRUSR|S_IWUSR);
if (fd == -1) {
exit(1);
}
if (lockf(fd, F_TLOCK, 0) == -1) {
exit(1);
}
len = snprintf(buf, sizeof(buf), "%ld\n", (long)getpid());
if (write(fd, buf, len) < 0)
exit(1);
signal(SIGCHLD, child_exit);
signal(SIGTSTP, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
signal(SIGTTIN, SIG_IGN);
}
bool xen_setup(void)
{
xs = xs_daemon_open();
if (xs == NULL) {
dolog(LOG_ERR,
"Failed to contact xenstore (%m). Is it running?");
goto out;
}
xc = xc_interface_open(0,0,0);
if (!xc) {
dolog(LOG_ERR, "Failed to contact hypervisor (%m)");
goto out;
}
if (!xs_watch(xs, "@introduceDomain", "domlist")) {
dolog(LOG_ERR, "xenstore watch on @introduceDomain fails.");
goto out;
}
if (!xs_watch(xs, "@releaseDomain", "domlist")) {
dolog(LOG_ERR, "xenstore watch on @releaseDomain fails.");
goto out;
}
return true;
out:
if (xs)
xs_daemon_close(xs);
if (xc)
xc_interface_close(xc);
return false;
}
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