1 /* $NetBSD: rumpclient.h,v 1.10 2011/02/16 22:35:41 tron 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 #include <sys/null.h> 33 34 struct rumpclient_fork; 35 36 #define rumpclient_vfork() rumpclient__dofork(vfork) 37 38 __BEGIN_DECLS 39 40 int rumpclient_syscall(int, const void *, size_t, register_t *); 41 int rumpclient_init(void); 42 43 struct rumpclient_fork *rumpclient_prefork(void); 44 int rumpclient_fork_init(struct rumpclient_fork *); 45 void rumpclient_fork_cancel(struct rumpclient_fork *); 46 void rumpclient_fork_vparent(struct rumpclient_fork *); 47 48 pid_t rumpclient_fork(void); 49 int rumpclient_exec(const char *, char *const [], char *const[]); 50 int rumpclient_daemon(int, int); 51 52 #define RUMPCLIENT_RETRYCONN_INFTIME ((time_t)-1) 53 #define RUMPCLIENT_RETRYCONN_ONCE ((time_t)-2) 54 #define RUMPCLIENT_RETRYCONN_DIE ((time_t)-3) 55 void rumpclient_setconnretry(time_t); 56 57 enum rumpclient_closevariant { 58 RUMPCLIENT_CLOSE_CLOSE, 59 RUMPCLIENT_CLOSE_DUP2, 60 RUMPCLIENT_CLOSE_FCLOSEM 61 }; 62 int rumpclient__closenotify(int *, enum rumpclient_closevariant); 63 64 /* 65 * vfork needs to be implemented as an inline to make everything 66 * run in the caller's stackframe. 67 */ 68 static inline pid_t 69 rumpclient__dofork(pid_t (*forkfn)(void)) 70 { 71 struct rumpclient_fork *rf; 72 pid_t pid; 73 int childran = 0; 74 75 if ((rf = rumpclient_prefork()) == NULL) 76 return -1; 77 78 switch ((pid = forkfn())) { 79 case -1: 80 rumpclient_fork_cancel(rf); 81 break; 82 case 0: 83 childran = 1; 84 if (rumpclient_fork_init(rf) == -1) 85 pid = -1; 86 break; 87 default: 88 /* XXX: multithreaded vforker? do they exist? */ 89 if (childran) 90 rumpclient_fork_vparent(rf); 91 break; 92 } 93 94 return pid; 95 } 96 97 __END_DECLS 98 99 #endif /* _RUMP_RUMPCLIENT_H_ */ 100