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https://github.com/xen-project/xen.git
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Andrew Cooper
9ab1792e1c
Coverity ID: 715218 1055876 1055877 Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> CC: Ian Campbell <Ian.Campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
146 lines
2.8 KiB
C
146 lines
2.8 KiB
C
/*\
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* Copyright (C) International Business Machines Corp., 2005
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* Author(s): Anthony Liguori <aliguori@us.ibm.com>
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*
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* Xen Console Daemon
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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\*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <string.h>
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#include <signal.h>
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#include "xenctrl.h"
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#include "utils.h"
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struct xs_handle *xs;
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xc_interface *xc;
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static void child_exit(int sig)
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{
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while (waitpid(-1, NULL, WNOHANG) > 0);
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}
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void daemonize(const char *pidfile)
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{
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pid_t pid;
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int fd;
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int len;
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int i;
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char buf[100];
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if (getppid() == 1) {
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return;
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}
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if ((pid = fork()) > 0) {
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exit(0);
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} else if (pid == -1) {
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err(errno, "fork() failed");
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}
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setsid();
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if ((pid = fork()) > 0) {
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exit(0);
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} else if (pid == -1) {
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err(errno, "fork() failed");
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}
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/* redirect fd 0,1,2 to /dev/null */
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if ((fd = open("/dev/null",O_RDWR)) == -1) {
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exit(1);
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}
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for (i = 0; i <= 2; i++) {
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close(i);
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dup2(fd, i);
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}
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close(fd);
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umask(027);
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if (chdir("/") < 0)
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exit (1);
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fd = open(pidfile, O_RDWR | O_CREAT, S_IRUSR|S_IWUSR);
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if (fd == -1) {
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exit(1);
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}
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if (lockf(fd, F_TLOCK, 0) == -1) {
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exit(1);
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}
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len = snprintf(buf, sizeof(buf), "%ld\n", (long)getpid());
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if (write(fd, buf, len) < 0)
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exit(1);
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signal(SIGCHLD, child_exit);
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signal(SIGTSTP, SIG_IGN);
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signal(SIGTTOU, SIG_IGN);
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signal(SIGTTIN, SIG_IGN);
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close(fd);
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}
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bool xen_setup(void)
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{
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xs = xs_daemon_open();
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if (xs == NULL) {
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dolog(LOG_ERR,
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"Failed to contact xenstore (%m). Is it running?");
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goto out;
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}
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xc = xc_interface_open(0,0,0);
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if (!xc) {
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dolog(LOG_ERR, "Failed to contact hypervisor (%m)");
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goto out;
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}
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if (!xs_watch(xs, "@introduceDomain", "domlist")) {
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dolog(LOG_ERR, "xenstore watch on @introduceDomain fails.");
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goto out;
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}
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if (!xs_watch(xs, "@releaseDomain", "domlist")) {
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dolog(LOG_ERR, "xenstore watch on @releaseDomain fails.");
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goto out;
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}
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return true;
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out:
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if (xs)
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xs_daemon_close(xs);
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if (xc)
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xc_interface_close(xc);
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return false;
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}
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