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-rw-r--r--libraries/liblutil/detach.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/libraries/liblutil/detach.c b/libraries/liblutil/detach.c
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+++ b/libraries/liblutil/detach.c
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+/* detach.c -- routines to daemonize a process */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 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.
+ *
+ * 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.
+ */
+/* This work was originally developed by the University of Michigan
+ * and distributed as part of U-MICH LDAP.
+ */
+
+#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"
+
+int
+lutil_detach( int debug, int do_close )
+{
+ int i, sd, nbits, pid;
+
+#ifdef HAVE_SYSCONF
+ nbits = sysconf( _SC_OPEN_MAX );
+#elif defined(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++ ) {
+#ifdef HAVE_THR
+ pid = fork1();
+#else
+ pid = fork();
+#endif
+ switch ( pid )
+ {
+ case -1:
+ sleep( 5 );
+ continue;
+
+ case 0:
+ break;
+
+ default:
+ return pid;
+ }
+ 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 defined(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
+ return 0;
+}