1/* $NetBSD: rumpclient.h,v 1.17 2017/05/11 18:44:50 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2010 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#ifndef _RUMP_RUMPCLIENT_H_ 29#define _RUMP_RUMPCLIENT_H_ 30 31#include <sys/types.h> 32 33#if !defined(__returns_twice) 34#ifdef __GNUC__ 35#define __returns_twice __attribute__((__returns_twice__)) 36#else /* __GNUC__ */ 37#define __returns_twice 38#endif /* !__GNUC__ */ 39#endif /* !__returns_twice */ 40 41#if !defined(RUMP_REGISTER_T) 42# define RUMP_REGISTER_T long 43# if !defined(_KERNEL) && !defined(_KMEMUSER) && \ 44 !defined(_KERNTYPES) && !defined(_STANDALONE) 45typedef RUMP_REGISTER_T register_t; 46# endif 47#endif 48 49struct rumpclient_fork; 50 51#define rumpclient_vfork() rumpclient__dofork(vfork) 52 53#ifdef __BEGIN_DECLS 54__BEGIN_DECLS 55#elif defined(__cplusplus) 56extern "C" { 57#endif 58 59int rumpclient_syscall(int, const void *, size_t, register_t *); 60int rumpclient_init(void); 61 62struct rumpclient_fork *rumpclient_prefork(void); 63int rumpclient_fork_init(struct rumpclient_fork *); 64void rumpclient_fork_cancel(struct rumpclient_fork *); 65void rumpclient_fork_vparent(struct rumpclient_fork *); 66 67pid_t rumpclient_fork(void); 68int rumpclient_exec(const char *, char *const [], char *const[]); 69int rumpclient_daemon(int, int); 70 71#define RUMPCLIENT_RETRYCONN_INFTIME ((time_t)-1) 72#define RUMPCLIENT_RETRYCONN_ONCE ((time_t)-2) 73#define RUMPCLIENT_RETRYCONN_DIE ((time_t)-3) 74void rumpclient_setconnretry(time_t); 75 76enum rumpclient_closevariant { 77 RUMPCLIENT_CLOSE_CLOSE, 78 RUMPCLIENT_CLOSE_DUP2, 79 RUMPCLIENT_CLOSE_FCLOSEM 80}; 81int rumpclient__closenotify(int *, enum rumpclient_closevariant); 82 83 84/* 85 * vfork needs to be implemented as an inline to make everything 86 * run in the caller's stackframe. 87 */ 88static __attribute__((__always_inline__)) __returns_twice inline pid_t 89rumpclient__dofork(pid_t (*forkfn)(void)) 90{ 91 struct rumpclient_fork *rf; 92 pid_t pid; 93 int childran = 0; 94 95 if (!(rf = rumpclient_prefork())) 96 return -1; 97 98 switch ((pid = forkfn())) { 99 case -1: 100 rumpclient_fork_cancel(rf); 101 break; 102 case 0: 103 childran = 1; 104 if (rumpclient_fork_init(rf) == -1) 105 pid = -1; 106 break; 107 default: 108 /* XXX: multithreaded vforker? do they exist? */ 109 if (childran) 110 rumpclient_fork_vparent(rf); 111 break; 112 } 113 114 return pid; 115} 116 117#ifdef __END_DECLS 118__END_DECLS 119#elif defined(__cplusplus) 120} 121#endif 122 123#endif /* _RUMP_RUMPCLIENT_H_ */ 124