#
# http://www.gluelogic.com/code/
#
diff -ru daemontools-0.76/src/error.h daemontools-0.76.new/src/error.h
--- daemontools-0.76/src/error.h	2001-07-12 12:49:49.000000000 -0400
+++ daemontools-0.76.new/src/error.h	2004-01-10 06:50:37.000000000 -0500
@@ -3,7 +3,7 @@
 #ifndef ERROR_H
 #define ERROR_H
 
-extern int errno;
+#include <errno.h>
 
 extern int error_intr;
 extern int error_nomem;
diff -ru daemontools-0.76/src/svscan.c daemontools-0.76.new/src/svscan.c
--- daemontools-0.76/src/svscan.c	2001-07-12 12:49:49.000000000 -0400
+++ daemontools-0.76.new/src/svscan.c	2004-02-08 01:50:27.000000000 -0500
@@ -1,6 +1,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <fcntl.h>
 #include "direntry.h"
 #include "strerr.h"
 #include "error.h"
@@ -14,6 +15,11 @@
 
 #define SERVICES 1000
 
+#ifndef SVSCANINFO
+#define SVSCANINFO ".svscan"  /* must begin with dot ('.') */
+#endif
+
+#define INFO "svscan: info: "
 #define WARNING "svscan: warning: "
 #define FATAL "svscan: fatal: "
 
@@ -38,7 +44,7 @@
   int i;
   const char *args[3];
 
-  if (fn[0] == '.') return;
+  if (fn[0] == '.' && str_diff(fn,SVSCANINFO)) return;
 
   if (stat(fn,&st) == -1) {
     strerr_warn4(WARNING,"unable to stat ",fn,": ",&strerr_sys);
@@ -59,7 +65,8 @@
     }
     x[i].ino = st.st_ino;
     x[i].dev = st.st_dev;
-    x[i].pid = 0;
+    /*(fn[0]=='.' here only if SVSCANINFO; if so only supervise log/ subdir)*/
+    x[i].pid = (fn[0] != '.') ? 0 : -1;
     x[i].pidlog = 0;
     x[i].flaglog = 0;
 
@@ -190,12 +197,39 @@
   }
 }
 
+static void open_svscan_log(void)
+{
+  const int i = numx;
+  struct stat st;
+  static char fn[] = SVSCANINFO;  /* avoid compiler warning on const string */
+
+  /* (semi-paranoid; could be moreso) */
+  if (fstat(STDIN_FILENO,&st)  != 0 && errno == EBADF)
+    (void) open("/dev/null", O_RDONLY);
+  if (fstat(STDOUT_FILENO,&st) != 0 && errno == EBADF)
+    (void) open("/dev/null", O_WRONLY);
+  if (fstat(STDERR_FILENO,&st) != 0 && errno == EBADF)
+    (void) open("/dev/null", O_WRONLY);
+
+  if (stat(fn,&st) == 0) {
+    start(fn);
+    if (i+1 == numx && x[i].pidlog != 0) {
+      (void) dup2(x[i].pi[1], STDOUT_FILENO);
+      (void) dup2(x[i].pi[1], STDERR_FILENO);
+      strerr_warn1("",0);
+      strerr_warn2(INFO,"*** Starting svscan",0);
+    }
+  }
+}
+
 int main(int argc,char **argv)
 {
   if (argv[0] && argv[1])
     if (chdir(argv[1]) == -1)
       strerr_die4sys(111,FATAL,"unable to chdir to ",argv[1],": ");
 
+  open_svscan_log();
+
   for (;;) {
     doit();
     sleep(5);