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65d76d7db4
open /dev/null and then / in read-only mode if opening /dev/null failed, and skip the dup2()s as well if open() failed.
126 lines
2.3 KiB
C
126 lines
2.3 KiB
C
/* $OpenLDAP$ */
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/*
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* Copyright (c) 1990, 1994 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/stdlib.h>
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#include <ac/signal.h>
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#include <ac/socket.h>
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#include <ac/unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#include "lutil.h"
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void
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lutil_detach( int debug, int do_close )
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{
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int i, sd, nbits;
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#ifdef HAVE_SYSCONF
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nbits = sysconf( _SC_OPEN_MAX );
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#elif HAVE_GETDTABLESIZE
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nbits = getdtablesize();
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#else
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nbits = FD_SETSIZE;
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#endif
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#ifdef FD_SETSIZE
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if ( nbits > FD_SETSIZE ) {
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nbits = FD_SETSIZE;
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}
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#endif /* FD_SETSIZE */
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if ( debug == 0 ) {
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for ( i = 0; i < 5; i++ ) {
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#if HAVE_THR
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switch ( fork1() )
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#else
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switch ( fork() )
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#endif
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{
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case -1:
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sleep( 5 );
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continue;
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case 0:
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break;
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default:
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_exit( EXIT_SUCCESS );
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}
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break;
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}
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if ( (sd = open( "/dev/null", O_RDWR )) == -1 &&
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(sd = open( "/dev/null", O_RDONLY )) == -1 &&
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/* Panic -- open *something* */
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(sd = open( "/", O_RDONLY )) == -1 ) {
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perror("/dev/null");
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} else {
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/* redirect stdin, stdout, stderr to /dev/null */
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dup2( sd, STDIN_FILENO );
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dup2( sd, STDOUT_FILENO );
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dup2( sd, STDERR_FILENO );
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switch( sd ) {
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default:
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close( sd );
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case STDIN_FILENO:
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case STDOUT_FILENO:
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case STDERR_FILENO:
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break;
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}
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}
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if ( do_close ) {
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/* close everything else */
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for ( i = 0; i < nbits; i++ ) {
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if( i != STDIN_FILENO &&
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i != STDOUT_FILENO &&
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i != STDERR_FILENO )
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{
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close( i );
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}
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}
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}
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#ifdef CHDIR_TO_ROOT
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(void) chdir( "/" );
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#endif
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#ifdef HAVE_SETSID
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(void) setsid();
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#elif TIOCNOTTY
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if ( (sd = open( "/dev/tty", O_RDWR )) != -1 ) {
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(void) ioctl( sd, TIOCNOTTY, NULL );
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(void) close( sd );
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}
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#endif
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}
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#ifdef SIGPIPE
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(void) SIGNAL( SIGPIPE, SIG_IGN );
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#endif
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}
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