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