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+/* fork.c - fork and exec a process, connecting stdin/out w/pipes */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 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>.
+ */
+/* Portions Copyright (c) 1995 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.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was originally developed by the University of Michigan
+ * (as part of U-MICH LDAP).
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/errno.h>
+#include <ac/string.h>
+#include <ac/socket.h>
+#include <ac/unistd.h>
+
+#include "slap.h"
+#include "shell.h"
+
+pid_t
+forkandexec(
+ char **args,
+ FILE **rfp,
+ FILE **wfp
+)
+{
+ int p2c[2] = { -1, -1 }, c2p[2];
+ pid_t pid;
+
+ if ( pipe( p2c ) != 0 || pipe( c2p ) != 0 ) {
+ Debug( LDAP_DEBUG_ANY, "pipe failed\n", 0, 0, 0 );
+ close( p2c[0] );
+ close( p2c[1] );
+ return( -1 );
+ }
+
+ /*
+ * what we're trying to set up looks like this:
+ * parent *wfp -> p2c[1] | p2c[0] -> stdin child
+ * parent *rfp <- c2p[0] | c2p[1] <- stdout child
+ */
+
+ fflush( NULL );
+# ifdef HAVE_THR
+ pid = fork1();
+# else
+ pid = fork();
+# endif
+ if ( pid == 0 ) { /* child */
+ /*
+ * child could deadlock here due to resources locked
+ * by our parent
+ *
+ * If so, configure --without-threads.
+ */
+ if ( dup2( p2c[0], 0 ) == -1 || dup2( c2p[1], 1 ) == -1 ) {
+ Debug( LDAP_DEBUG_ANY, "dup2 failed\n", 0, 0, 0 );
+ exit( EXIT_FAILURE );
+ }
+ }
+ close( p2c[0] );
+ close( c2p[1] );
+ if ( pid <= 0 ) {
+ close( p2c[1] );
+ close( c2p[0] );
+ }
+ switch ( pid ) {
+ case 0:
+ execv( args[0], args );
+
+ Debug( LDAP_DEBUG_ANY, "execv failed\n", 0, 0, 0 );
+ exit( EXIT_FAILURE );
+
+ case -1: /* trouble */
+ Debug( LDAP_DEBUG_ANY, "fork failed\n", 0, 0, 0 );
+ return( -1 );
+ }
+
+ /* parent */
+ if ( (*rfp = fdopen( c2p[0], "r" )) == NULL || (*wfp = fdopen( p2c[1],
+ "w" )) == NULL ) {
+ Debug( LDAP_DEBUG_ANY, "fdopen failed\n", 0, 0, 0 );
+ if ( *rfp ) {
+ fclose( *rfp );
+ *rfp = NULL;
+ } else {
+ close( c2p[0] );
+ }
+ close( p2c[1] );
+
+ return( -1 );
+ }
+
+ return( pid );
+}