mirror of
https://github.com/xen-project/xen.git
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Ross Lagerwall
26d4eebee8
Previously, xenconsoled's daemonize function would do nothing if its parent process is init (as it is under systemd but not sysv init). This is confusing. Instead, always daemonize when asked to, but use the "interactive" switch when running from the systemd service. Because a pidfile is only written when daemonizing, drop the pidfile parameters from the service file (systemd keeps track of the pids anyway). Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
141 lines
2.7 KiB
C
141 lines
2.7 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, see <http://www.gnu.org/licenses/>.
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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 ((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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