+/* detach.c -- routines to daemonize a process */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2012 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
/*
* Copyright (c) 1990, 1994 Regents of the University of Michigan.
* All rights reserved.
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
+/* This work was originally developed by the University of Michigan
+ * and distributed as part of U-MICH LDAP.
+ */
#include "portable.h"
#include "lutil.h"
-void
+int
lutil_detach( int debug, int do_close )
{
- int i, sd, nbits;
+ int i, sd, nbits, pid;
#ifdef HAVE_SYSCONF
nbits = sysconf( _SC_OPEN_MAX );
-#elif HAVE_GETDTABLESIZE
+#elif defined(HAVE_GETDTABLESIZE)
nbits = getdtablesize();
#else
nbits = FD_SETSIZE;
if ( debug == 0 ) {
for ( i = 0; i < 5; i++ ) {
-#if HAVE_THR
- switch ( fork1() )
+#ifdef HAVE_THR
+ pid = fork1();
#else
- switch ( fork() )
+ pid = fork();
#endif
+ switch ( pid )
{
case -1:
sleep( 5 );
break;
default:
- _exit( EXIT_SUCCESS );
+ return pid;
}
break;
}
- if ( do_close )
- for ( i = 3; i < nbits; i++ )
- close( i );
-
- (void) chdir( "/" );
+ 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 ( (sd = open( "/dev/null", O_RDWR )) == -1 ) {
- perror( "/dev/null" );
- exit( EXIT_FAILURE );
+ if ( do_close ) {
+ /* close everything else */
+ for ( i = 0; i < nbits; i++ ) {
+ if( i != STDIN_FILENO &&
+ i != STDOUT_FILENO &&
+ i != STDERR_FILENO )
+ {
+ close( i );
+ }
+ }
}
- for ( i = 0; i < 3; i++ )
- if ( sd != i && isatty( i ) )
- (void) dup2( sd, i );
- if ( sd > 2 )
- close( sd );
+
+#ifdef CHDIR_TO_ROOT
+ (void) chdir( "/" );
+#endif
#ifdef HAVE_SETSID
(void) setsid();
-#elif TIOCNOTTY
+#elif defined(TIOCNOTTY)
if ( (sd = open( "/dev/tty", O_RDWR )) != -1 ) {
(void) ioctl( sd, TIOCNOTTY, NULL );
(void) close( sd );
#ifdef SIGPIPE
(void) SIGNAL( SIGPIPE, SIG_IGN );
#endif
+ return 0;
}