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rumpclient.h revision 1.9 
      1 /*	$NetBSD: rumpclient.h,v 1.9 2011/02/16 19:58:01 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 struct rumpclient_fork;
     34 
     35 #define rumpclient_vfork() rumpclient__dofork(vfork)
     36 
     37 __BEGIN_DECLS
     38 
     39 int rumpclient_syscall(int, const void *, size_t, register_t *);
     40 int rumpclient_init(void);
     41 
     42 struct rumpclient_fork *rumpclient_prefork(void);
     43 int			rumpclient_fork_init(struct rumpclient_fork *);
     44 void			rumpclient_fork_cancel(struct rumpclient_fork *);
     45 void			rumpclient_fork_vparent(struct rumpclient_fork *);
     46 
     47 pid_t rumpclient_fork(void);
     48 int rumpclient_exec(const char *, char *const [], char *const[]);
     49 int rumpclient_daemon(int, int);
     50 
     51 #define RUMPCLIENT_RETRYCONN_INFTIME ((time_t)-1)
     52 #define RUMPCLIENT_RETRYCONN_ONCE ((time_t)-2)
     53 #define RUMPCLIENT_RETRYCONN_DIE ((time_t)-3)
     54 void rumpclient_setconnretry(time_t);
     55 
     56 enum rumpclient_closevariant {
     57 	RUMPCLIENT_CLOSE_CLOSE,
     58 	RUMPCLIENT_CLOSE_DUP2,
     59 	RUMPCLIENT_CLOSE_FCLOSEM
     60 };
     61 int rumpclient__closenotify(int *, enum rumpclient_closevariant);
     62 
     63 /*
     64  * vfork needs to be implemented as an inline to make everything
     65  * run in the caller's stackframe.
     66  */
     67 static inline pid_t
     68 rumpclient__dofork(pid_t (*forkfn)(void))
     69 {
     70 	struct rumpclient_fork *rf;
     71 	pid_t pid;
     72 	int childran = 0;
     73 
     74 	if ((rf = rumpclient_prefork()) == NULL)
     75 		return -1;
     76 
     77 	switch ((pid = forkfn())) {
     78 	case -1:
     79 		rumpclient_fork_cancel(rf);
     80 		break;
     81 	case 0:
     82 		childran = 1;
     83 		if (rumpclient_fork_init(rf) == -1)
     84 			pid = -1;
     85 		break;
     86 	default:
     87 		/* XXX: multithreaded vforker?  do they exist? */
     88 		if (childran)
     89 			rumpclient_fork_vparent(rf);
     90 		break;
     91 	}
     92 
     93 	return pid;
     94 }
     95 
     96 __END_DECLS
     97 
     98 #endif /* _RUMP_RUMPCLIENT_H_ */
     99