minit

commit 06e88f445336e2732ccd423178d808df64661483
parent b2105d862b1f0e6c351c11c12438d611e7a35daf
Author: leitner <leitner>
Date:   Mon, 13 Apr 2015 18:29:06 +0000

  add powersave (demo tool to set up power saving, needs customization, not actually installed)

Diffstat:
M
.cvsignore
 | 
2
++
M
CHANGES
 | 
2
++
M
Makefile
 | 
3
++-
A
powersave.c
 | 
84
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 90 insertions(+), 1 deletion(-)
diff --git a/.cvsignore b/.cvsignore
@@ -9,3 +9,5 @@ shutdown
 minit-update
 serdo
 ftrigger
+waitinterface
+waitport
diff --git a/CHANGES b/CHANGES
@@ -10,6 +10,8 @@
   only install SIGWINCH and SIGINT if running with PID 1
   you can now do "make MINITROOT=/var/minit"
   add ftrigger (run a command if a file changes)
+  add waitinterface and waitport (to resolve races)
+  add powersave (demo tool to set up power saving, needs customization, not actually installed)
 
 0.10:
   add sample script for /etc/minit/ctrlaltdel/run as
diff --git a/Makefile b/Makefile
@@ -1,5 +1,5 @@
 all: minit msvc pidfilehack hard-reboot write_proc killall5 shutdown \
-minit-update serdo ftrigger waitinterface waitport # governor
+minit-update serdo ftrigger waitinterface waitport powersave # governor
 
 #CFLAGS=-pipe -march=i386 -fomit-frame-pointer -Os -I../dietlibc/include
 CC=gcc
@@ -53,6 +53,7 @@ minit-update: minit-update.o split.o openreadclose.o
 serdo: serdo.o
 waitinterface: waitinterface.o
 waitport: waitport.o
+powersave: powersave.o
 governor: governor.o
 
 shutdown: shutdown.o split.o openreadclose.o opendevconsole.o
diff --git a/powersave.c b/powersave.c
@@ -0,0 +1,84 @@
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <open.h>
+#include <string.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+
+int write_to(const char* filename,const char* string) {
+  int fd=open_write(filename);
+  if (fd!=-1) {
+    write(fd,string,strlen(string));
+    fd=close(fd);
+  }
+  return fd;
+}
+
+void handle(const char* s) {
+  size_t l=strlen(s);
+  char* x=alloca(l+20);
+  strcpy(x,s);
+  strcpy(x+l,"/power/control");
+  write_to(x,"auto");
+}
+
+void dwim(const char* name) {
+  DIR* D;
+  struct dirent* d;
+  if (chdir(name)) return;
+  if (!(D=opendir("."))) return;
+  while ((d=readdir(D))) {
+//    puts(d->d_name);
+    handle(d->d_name);
+  }
+  closedir(D);
+}
+
+void pci() {
+  dwim("/sys/bus/pci/devices");
+}
+
+void usb() {
+  dwim("/sys/bus/usb/devices");
+}
+
+void wakeonlan(const char* interface) {
+  struct ethtool_wolinfo {
+   uint32_t cmd,supported,wolopts;
+   char sopass[6];
+  } wol;
+  int fd=socket(PF_INET,SOCK_DGRAM,0);
+  struct ifreq ifr;
+  if (strlen(interface) > IFNAMSIZ)
+    return;
+  memset(&ifr,0,sizeof(ifr));
+  strncpy(ifr.ifr_name,interface,sizeof(ifr.ifr_name));
+  ifr.ifr_data=(void*)&wol;
+  memset(&wol,0,sizeof(wol));
+  wol.cmd=6;	// ETHTOOL_SWOL
+  wol.wolopts=0;
+  ioctl(fd,SIOCETHTOOL,&ifr);
+  close(fd);
+}
+
+int main() {
+  write_to("/sys/class/scsi_host/host0/link_power_management_policy","min_power");
+  write_to("/sys/class/scsi_host/host1/link_power_management_policy","min_power");
+  write_to("/sys/class/scsi_host/host2/link_power_management_policy","min_power");
+  write_to("/sys/class/scsi_host/host3/link_power_management_policy","min_power");
+  write_to("/sys/class/scsi_host/host4/link_power_management_policy","min_power");
+  write_to("/sys/class/scsi_host/host5/link_power_management_policy","min_power");
+  write_to("/sys/class/scsi_host/host6/link_power_management_policy","min_power");
+  write_to("/sys/module/snd_hda_intel/parameters/power_save","1");
+  write_to("/sys/bus/usb/devices/1-3/power/control","auto");
+  write_to("/sys/bus/usb/devices/1-4/power/control","auto");
+  write_to("/proc/sys/vm/dirty_writeback_centisecs","1500");
+  pci();
+  wakeonlan("eth0");
+//  usb();
+  return 0;
+}