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/* detach.c -- routines to daemonize a process */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2021 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;
}
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