/* fork.c - fork and exec a process, connecting stdin/out w/pipes */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * 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 * . */ /* 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 #include #include #include #include #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 ); }