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merge2

--- a/rc/bin/fshalt

+++ b/rc/bin/fshalt

@@ -48,6 +48,7 @@

 cp /bin/rc /tmp

 cp /bin/sed /tmp

 cp /bin/sleep /tmp

+cp /bin/scram /tmp

 bind /tmp /rc

 bind /tmp /bin

@@ -77,6 +78,7 @@

 		echo rebooting...

 		echo reboot >'#c/reboot'

 	}

+	if not scram

 }

 x

--- a/sys/man/8/fshalt

+++ b/sys/man/8/fshalt

@@ -1,6 +1,6 @@

 .TH FSHALT 8

 .SH NAME

-fshalt, reboot \- halt any local file systems and optionally reboot the system

+fshalt, scram, reboot \- halt any local file systems and optionally shut down or reboot the system

 .SH SYNOPSIS

 .B fshalt

 [

@@ -8,6 +8,8 @@

 ]

 .br

 .B reboot

+.br

+.B scram

 .SH DESCRIPTION

 .I Fshalt

 syncs all local

@@ -25,6 +27,9 @@

 .BR -r ,

 .I fshalt

 will then reboot the machine.

+Else it will invoke

+.I scram

+to shut down the machine.

 The halting and rebooting is done by copying all necessary

 commands into a

 .IR ramfs (4)

@@ -35,6 +40,9 @@

 .PP

 .I Reboot

 restarts the machine it is invoked on.

+.PP

+.I Scram

+shuts down the machine it is invoked on.

 .SH SOURCE

 .B /rc/bin/fshalt

 .br

@@ -43,6 +51,9 @@

 .IR cons (3),

 .IR reboot (8)

 .SH BUGS

-On standalone machines, it will be impossible to do anything

+On standalone machines, it will be impossible to do anything if scram fails

 after invoking bare

-.LR fshalt .

+.IR fshalt .

+

+.I Scram

+is limited to the PC and requires APM.

--- /dev/null

+++ b/sys/src/cmd/scram.c

@@ -1,0 +1,20 @@

+#include <u.h>

+#include </386/include/ureg.h>

+typedef struct Ureg Ureg;

+#include <libc.h>

+

+void

+main()

+{

+	Ureg ureg;

+	int fd;

+	

+	fd = open("/dev/apm", OWRITE);

+	if(fd < 0) sysfatal("%r");

+	memset(&ureg, 0, sizeof ureg);

+	ureg.ax = 0x5307;

+	ureg.bx = 0x0001;

+	ureg.cx = 0x0003;

+	ureg.trap = 0x15;

+	write(fd, &ureg, sizeof ureg);

+}

-- 

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