Daemonize option, by Anthony Liguori.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2261 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/vl.c b/vl.c
index 929d2a9..c56c87c 100644
--- a/vl.c
+++ b/vl.c
@@ -163,6 +163,7 @@
int acpi_enabled = 1;
int fd_bootchk = 1;
int no_reboot = 0;
+int daemonize = 0;
/***********************************************************/
/* x86 ISA bus support */
@@ -6018,6 +6019,9 @@
"-no-reboot exit instead of rebooting\n"
"-loadvm file start right away with a saved state (loadvm in monitor)\n"
"-vnc display start a VNC server on display\n"
+#ifndef _WIN32
+ "-daemonize daemonize QEMU after initializing\n"
+#endif
"\n"
"During emulation, the following keys are useful:\n"
"ctrl-alt-f toggle full screen\n"
@@ -6098,6 +6102,7 @@
QEMU_OPTION_vnc,
QEMU_OPTION_no_acpi,
QEMU_OPTION_no_reboot,
+ QEMU_OPTION_daemonize,
};
typedef struct QEMUOption {
@@ -6178,6 +6183,7 @@
{ "cirrusvga", 0, QEMU_OPTION_cirrusvga },
{ "no-acpi", 0, QEMU_OPTION_no_acpi },
{ "no-reboot", 0, QEMU_OPTION_no_reboot },
+ { "daemonize", 0, QEMU_OPTION_daemonize },
{ NULL },
};
@@ -6408,6 +6414,7 @@
QEMUMachine *machine;
char usb_devices[MAX_USB_CMDLINE][128];
int usb_devices_index;
+ int fds[2];
LIST_INIT (&vm_change_state_head);
#ifndef _WIN32
@@ -6826,10 +6833,61 @@
case QEMU_OPTION_no_reboot:
no_reboot = 1;
break;
+ case QEMU_OPTION_daemonize:
+ daemonize = 1;
+ break;
}
}
}
+#ifndef _WIN32
+ if (daemonize && !nographic && vnc_display == NULL) {
+ fprintf(stderr, "Can only daemonize if using -nographic or -vnc\n");
+ daemonize = 0;
+ }
+
+ if (daemonize) {
+ pid_t pid;
+
+ if (pipe(fds) == -1)
+ exit(1);
+
+ pid = fork();
+ if (pid > 0) {
+ uint8_t status;
+ ssize_t len;
+
+ close(fds[1]);
+
+ again:
+ len = read(fds[0], &status, 1);
+ if (len == -1 && (errno == EINTR))
+ goto again;
+
+ if (len != 1 || status != 0)
+ exit(1);
+ else
+ exit(0);
+ } else if (pid < 0)
+ exit(1);
+
+ setsid();
+
+ pid = fork();
+ if (pid > 0)
+ exit(0);
+ else if (pid < 0)
+ exit(1);
+
+ umask(027);
+ chdir("/");
+
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGTTOU, SIG_IGN);
+ signal(SIGTTIN, SIG_IGN);
+ }
+#endif
+
#ifdef USE_KQEMU
if (smp_cpus > 1)
kqemu_allowed = 0;
@@ -7028,6 +7086,30 @@
}
}
+ if (daemonize) {
+ uint8_t status = 0;
+ ssize_t len;
+ int fd;
+
+ again1:
+ len = write(fds[1], &status, 1);
+ if (len == -1 && (errno == EINTR))
+ goto again1;
+
+ if (len != 1)
+ exit(1);
+
+ fd = open("/dev/null", O_RDWR);
+ if (fd == -1)
+ exit(1);
+
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+
+ close(fd);
+ }
+
main_loop();
quit_timers();
return 0;
