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rumpclient.h revision 1.13 
      1 /*	$NetBSD: rumpclient.h,v 1.13 2013/01/17 20:47:44 pooka 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 struct rumpclient_fork;
     42 
     43 #define rumpclient_vfork() rumpclient__dofork(vfork)
     44 
     45 #ifdef __BEGIN_DECLS
     46 __BEGIN_DECLS
     47 #else
     48 extern "C" {
     49 #endif
     50 
     51 int rumpclient_syscall(int, const void *, size_t, register_t *);
     52 int rumpclient_init(void);
     53 
     54 struct rumpclient_fork *rumpclient_prefork(void);
     55 int			rumpclient_fork_init(struct rumpclient_fork *);
     56 void			rumpclient_fork_cancel(struct rumpclient_fork *);
     57 void			rumpclient_fork_vparent(struct rumpclient_fork *);
     58 
     59 pid_t rumpclient_fork(void);
     60 int rumpclient_exec(const char *, char *const [], char *const[]);
     61 int rumpclient_daemon(int, int);
     62 
     63 #define RUMPCLIENT_RETRYCONN_INFTIME ((time_t)-1)
     64 #define RUMPCLIENT_RETRYCONN_ONCE ((time_t)-2)
     65 #define RUMPCLIENT_RETRYCONN_DIE ((time_t)-3)
     66 void rumpclient_setconnretry(time_t);
     67 
     68 enum rumpclient_closevariant {
     69 	RUMPCLIENT_CLOSE_CLOSE,
     70 	RUMPCLIENT_CLOSE_DUP2,
     71 	RUMPCLIENT_CLOSE_FCLOSEM
     72 };
     73 int rumpclient__closenotify(int *, enum rumpclient_closevariant);
     74 
     75 
     76 /*
     77  * vfork needs to be implemented as an inline to make everything
     78  * run in the caller's stackframe.
     79  */
     80 static __attribute__((__always_inline__)) __returns_twice inline pid_t
     81 rumpclient__dofork(pid_t (*forkfn)(void))
     82 {
     83 	struct rumpclient_fork *rf;
     84 	pid_t pid;
     85 	int childran = 0;
     86 
     87 	if (!(rf = rumpclient_prefork()))
     88 		return -1;
     89 
     90 	switch ((pid = forkfn())) {
     91 	case -1:
     92 		rumpclient_fork_cancel(rf);
     93 		break;
     94 	case 0:
     95 		childran = 1;
     96 		if (rumpclient_fork_init(rf) == -1)
     97 			pid = -1;
     98 		break;
     99 	default:
    100 		/* XXX: multithreaded vforker?  do they exist? */
    101 		if (childran)
    102 			rumpclient_fork_vparent(rf);
    103 		break;
    104 	}
    105 
    106 	return pid;
    107 }
    108 
    109 #ifdef __END_DECLS
    110 __END_DECLS
    111 #else
    112 }
    113 #endif
    114 
    115 #endif /* _RUMP_RUMPCLIENT_H_ */
    116