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87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
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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 <stdio.h>
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <signal.h>
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#include "portable.h"
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#ifdef USE_SYSCONF
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#include <unistd.h>
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#endif /* USE_SYSCONF */
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detach( debug )
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int debug;
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{
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int i, sd, nbits;
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#ifdef USE_SYSCONF
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nbits = sysconf( _SC_OPEN_MAX );
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#else /* USE_SYSCONF */
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nbits = getdtablesize();
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#endif /* USE_SYSCONF */
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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 || !(isatty( 1 )) ) {
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for ( i = 0; i < 5; i++ ) {
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switch ( fork() ) {
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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( 0 );
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}
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break;
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}
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for ( i = 3; i < nbits; i++ )
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close( i );
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(void) chdir( "/" );
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if ( (sd = open( "/dev/null", O_RDWR )) == -1 ) {
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if ( debug ) perror( "/dev/null" );
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exit( 1 );
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}
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if ( isatty( 0 ) )
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(void) dup2( sd, 0 );
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if ( isatty( 1 ) )
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(void) dup2( sd, 1 );
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if ( isatty(2) )
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(void) dup2( sd, 2 );
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close( sd );
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#ifdef USE_SETSID
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(void) setsid();
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#else /* USE_SETSID */
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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 /* USE_SETSID */
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}
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(void) signal( SIGPIPE, SIG_IGN );
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}
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