20060303a

1 files changed, 59 insertions, 0 deletions

diff --git a/appl/lib/powerman.b b/appl/lib/powerman.b
new file mode 100644
index 00000000..5b343726
--- /dev/null
+++ b/appl/lib/powerman.b
@@ -0,0 +1,59 @@
+implement Powerman;
+
+#
+# Copyright © 2001 Vita Nuova Holdings Limited.  All rights reserved.
+#
+
+include "sys.m";
+	sys: Sys;
+
+include "powerman.m";
+
+pid := 0;
+
+init(file: string, events: chan of string): int
+{
+	if(file == nil)
+		file = "/dev/powerdata";
+	fd := sys->open(file, Sys->OREAD);
+	if(fd == nil)
+		return -1;
+	pidc := chan of int;
+	spawn reader(fd, events, pidc);
+	return pid = <-pidc;
+}
+
+reader(fd: ref Sys->FD, events: chan of string, pidc: chan of int)
+{
+	pidc <-= sys->pctl(0, nil);
+	buf := array[128] of byte;
+	while((n := sys->read(fd, buf, len buf)) > 0){
+		if(buf[n-1] == byte '\n')
+			n--;
+		events <-= string buf[0:n];
+	}
+	events <-= "error";
+}
+
+stop()
+{
+	if(pid != 0){
+		fd := sys->open("#p/"+string pid+"/ctl", Sys->OWRITE);
+		if(fd != nil)
+			sys->fprint(fd, "kill");
+		pid = 0;
+	}
+}
+
+ack(op: string)
+{
+	ctl("ack "+op);
+}
+
+ctl(op: string): string
+{
+	fd := sys->open("/dev/powerctl", Sys->OWRITE);
+	if(fd != nil && sys->fprint(fd, "%s", op) >= 0)
+		return nil;
+	return sys->sprint("%r");
+}