mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
145 lines
3.0 KiB
C
145 lines
3.0 KiB
C
/* detach.c -- routines to daemonize a process */
|
|
/* $OpenLDAP$ */
|
|
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
|
|
*
|
|
* Copyright 1998-2020 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;
|
|
}
|