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detach.c
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C/C++ Source or Header
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1992-04-09
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1KB
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67 lines
/*
* Copyright (c) 1990 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.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <signal.h>
detach( debug )
int debug;
{
int i, sd, nbits;
nbits = getdtablesize();
if ( debug == 0 || !(isatty( 1 )) ) {
for ( i = 0; i < 5; i++ ) {
switch ( fork() ) {
case -1:
sleep( 5 );
continue;
case 0:
break;
default:
_exit( 0 );
}
break;
}
for ( i = 3; i < nbits; i++ )
close( i );
(void) chdir( "/" );
if ( (sd = open( "/dev/null", O_RDWR )) == -1 ) {
if ( debug ) perror( "/dev/null" );
exit( 1 );
}
if ( isatty( 0 ) )
(void) dup2( sd, 0 );
if ( isatty( 1 ) )
(void) dup2( sd, 1 );
if ( isatty(2) )
(void) dup2( sd, 2 );
close( sd );
if ( (sd = open( "/dev/tty", O_RDWR )) != -1 ) {
(void) ioctl( sd, TIOCNOTTY, NULL );
(void) close( sd );
}
}
(void) signal( SIGPIPE, SIG_IGN );
}