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halt: add a -k kexec flag
--- a/man/halt.8
+++ b/man/halt.8
@@ -40,6 +40,7 @@ halt, reboot, poweroff \- stop the system.
.RB [ \-d ]
.RB [ \-f ]
.RB [ \-i ]
+.RB [ \-k ]
.br
.B /sbin/poweroff
.RB [ \-n ]
@@ -83,6 +84,8 @@ Put all hard drives on the system in stand-by mode just before halt or power-off
.IP \fB\-p\fP
When halting the system, switch off the power. This is the default when halt is
called as \fBpoweroff\fP.
+.IP \fB\-k\fP
+Try to reboot using \fBkexec\fP, if kernel supports it.
.\"}}}
.\"{{{ Diagnostics
.SH DIAGNOSTICS
--- a/src/halt.c
+++ b/src/halt.c
@@ -8,7 +8,7 @@
* execute an "shutdown -r". This is for compatibility with
* sysvinit 2.4.
*
- * Usage: halt [-n] [-w] [-d] [-f] [-h] [-i] [-p]
+ * Usage: halt [-n] [-w] [-d] [-f] [-h] [-i] [-p] [-k]
* -n: don't sync before halting the system
* -w: only write a wtmp reboot record and exit.
* -d: don't write a wtmp record.
@@ -16,6 +16,7 @@
* -h: put harddisks in standby mode
* -i: shut down all network interfaces.
* -p: power down the system (if possible, otherwise halt).
+ * -k: reboot the system using kexec.
*
* Reboot and halt are both this program. Reboot
* is just a link to halt. Invoking the program
@@ -74,8 +75,10 @@ extern void write_wtmp(char *user, char *id, int pid, int type, char *line);
*/
void usage(void)
{
- fprintf(stderr, "usage: %s [-n] [-w] [-d] [-f] [-h] [-i]%s\n",
- progname, strcmp(progname, "halt") ? "" : " [-p]");
+ fprintf(stderr, "usage: %s [-n] [-w] [-d] [-f] [-h] [-i]%s%s\n",
+ progname,
+ strcmp(progname, "halt") ? "" : " [-p]",
+ strcmp(progname, "reboot") ? "" : " [-k]");
fprintf(stderr, "\t-n: don't sync before halting the system\n");
fprintf(stderr, "\t-w: only write a wtmp reboot record and exit.\n");
fprintf(stderr, "\t-d: don't write a wtmp record.\n");
@@ -84,6 +87,8 @@ void usage(void)
fprintf(stderr, "\t-i: shut down all network interfaces.\n");
if (!strcmp(progname, "halt"))
fprintf(stderr, "\t-p: power down the system (if possible, otherwise halt).\n");
+ if (!strcmp(progname, "reboot"))
+ fprintf(stderr, "\t-k: reboot the system using kexec.\n");
exit(1);
}
@@ -182,6 +187,7 @@ int main(int argc, char **argv)
int do_ifdown = 0;
int do_hddown = 0;
int do_poweroff = 0;
+ int do_kexec = 0;
int c;
char *tm = NULL;
@@ -201,7 +207,7 @@ int main(int argc, char **argv)
/*
* Get flags
*/
- while((c = getopt(argc, argv, ":ihdfnpwt:")) != EOF) {
+ while((c = getopt(argc, argv, ":ihdfnpwkt:")) != EOF) {
switch(c) {
case 'n':
do_sync = 0;
@@ -225,6 +231,9 @@ int main(int argc, char **argv)
case 'p':
do_poweroff = 1;
break;
+ case 'k':
+ do_kexec = 1;
+ break;
case 't':
tm = optarg;
break;
@@ -242,10 +251,24 @@ int main(int argc, char **argv)
(void)chdir("/");
if (!do_hard && !do_nothing) {
+ c = get_runlevel();
+
+ /*
+ * We can't reboot using kexec through this path.
+ */
+ if (c != '6' && do_reboot && do_kexec) {
+ fprintf(stderr, "ERROR: using -k at this"
+ " runlevel requires also -f\n"
+ " (You probably want instead to reboot"
+ " normally and let your reboot\n"
+ " script, usually /etc/init.d/reboot,"
+ " specify -k)\n");
+ exit(1);
+ }
+
/*
* See if we are in runlevel 0 or 6.
*/
- c = get_runlevel();
if (c != '0' && c != '6')
do_shutdown(do_reboot ? "-r" : "-h", tm);
}
@@ -277,6 +300,15 @@ int main(int argc, char **argv)
if (do_nothing) exit(0);
if (do_reboot) {
+ /*
+ * kexec or reboot
+ */
+ if (do_kexec)
+ init_reboot(BMAGIC_KEXEC);
+
+ /*
+ * Fall through if failed
+ */
init_reboot(BMAGIC_REBOOT);
} else {
/*
--- a/src/reboot.h
+++ b/src/reboot.h
@@ -47,5 +47,8 @@
# define BMAGIC_POWEROFF BMAGIC_HALT
#endif
+/* for kexec support */
+#define BMAGIC_KEXEC 0x45584543
+
#define init_reboot(magic) reboot(magic)
|
