new detach code from HEAD

diff --git a/libraries/liblutil/detach.c b/libraries/liblutil/detach.c
new file mode 100644 (file)
index 0000000..3692a46
--- /dev/null
+++ b/libraries/liblutil/detach.c
@@ -0,0 +1,125 @@
+/* $OpenLDAP$ */
+/*
+ * Copyright (c) 1990, 1994 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/stdlib.h>
+#include <ac/signal.h>
+#include <ac/socket.h>
+#include <ac/unistd.h>
+
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#ifdef HAVE_SYS_FILE_H
+#include <sys/file.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#include "lutil.h"
+
+void
+lutil_detach( int debug, int do_close )
+{
+       int             i, sd, nbits;
+
+#ifdef HAVE_SYSCONF
+       nbits = sysconf( _SC_OPEN_MAX );
+#elif HAVE_GETDTABLESIZE
+       nbits = getdtablesize();
+#else
+       nbits = FD_SETSIZE;
+#endif
+
+#ifdef FD_SETSIZE
+       if ( nbits > FD_SETSIZE ) {
+               nbits = FD_SETSIZE;
+       }
+#endif /* FD_SETSIZE */
+
+       if ( debug == 0 ) {
+               for ( i = 0; i < 5; i++ ) {
+#if HAVE_THR
+                       switch ( fork1() )
+#else
+                       switch ( fork() )
+#endif
+                       {
+                       case -1:
+                               sleep( 5 );
+                               continue;
+
+                       case 0:
+                               break;
+
+                       default:
+                               _exit( EXIT_SUCCESS );
+                       }
+                       break;
+               }
+
+               if ( (sd = open( "/dev/null", O_RDWR   )) == -1 &&
+                        (sd = open( "/dev/null", O_RDONLY )) == -1 &&
+                        /* Panic -- open *something* */
+                        (sd = open( "/",         O_RDONLY )) == -1    ) {
+                       perror("/dev/null");
+               } else {
+                       /* redirect stdin, stdout, stderr to /dev/null */
+                       dup2( sd, STDIN_FILENO );
+                       dup2( sd, STDOUT_FILENO );
+                       dup2( sd, STDERR_FILENO );
+
+                       switch( sd ) {
+                       default:
+                               close( sd );
+                       case STDIN_FILENO:
+                       case STDOUT_FILENO:
+                       case STDERR_FILENO:
+                               break;
+                       }
+               }
+
+               if ( do_close ) {
+                       /* close everything else */
+                       for ( i = 0; i < nbits; i++ ) {
+                               if( i != STDIN_FILENO &&
+                                       i != STDOUT_FILENO && 
+                                       i != STDERR_FILENO )
+                               {
+                                       close( i );
+                               }
+                       }
+               }
+
+#ifdef CHDIR_TO_ROOT
+               (void) chdir( "/" );
+#endif
+
+#ifdef HAVE_SETSID
+               (void) setsid();
+#elif TIOCNOTTY
+               if ( (sd = open( "/dev/tty", O_RDWR )) != -1 ) {
+                       (void) ioctl( sd, TIOCNOTTY, NULL );
+                       (void) close( sd );
+               }
+#endif
+       } 
+
+#ifdef SIGPIPE
+       (void) SIGNAL( SIGPIPE, SIG_IGN );
+#endif
+}