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Revamp detach code to ensure stdin, stdout, stderr get closed.

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This commit is contained in:
Kurt Zeilenga 2000-01-11 02:20:01 +00:00
parent d61873e930
commit 1fb42bf957
1 changed files with 25 additions and 11 deletions
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36
libraries/liblutil/detach.c
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@ -72,21 +72,35 @@ lutil_detach( int debug, int do_close )
break;
}
if ( do_close )
for ( i = 3; i < nbits; i++ )
if ( do_close ) {
if ( (sd = open( "/dev/null", O_RDWR )) != -1 ) {
perror("/dev/null");
}
for ( i = 0; i < nbits; i++ ) {
if( i == sd ) continue;
close( i );
(void) chdir( "/" );
if( i == STDIN_FILENO ||
i == STDOUT_FILENO ||
i == STDERR_FILENO )
{
/* attach /dev/null */
dup2( sd, i );
}
}
if ( (sd = open( "/dev/null", O_RDWR )) == -1 ) {
perror( "/dev/null" );
exit( EXIT_FAILURE );
if( sd != STDIN_FILENO &&
sd != STDOUT_FILENO &&
sd != STDERR_FILENO )
{
/* unless stdin, stdout, or stderr, close /dev/null */
close( sd );
}
}
for ( i = 0; i < 3; i++ )
if ( sd != i )
(void) dup2( sd, i );
if ( sd > 2 )
close( sd );
(void) chdir( "/" );
#ifdef HAVE_SETSID
(void) setsid();