Change sendfile() to use the new m_ext callback scheme for cleaning up after
[dragonfly.git] / sys / sys / sysent.h
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1/*-
2 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $
8ec60c3f 34 * $DragonFly: src/sys/sys/sysent.h,v 1.8 2004/07/24 20:21:35 dillon Exp $
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35 */
36
37#ifndef _SYS_SYSENT_H_
38#define _SYS_SYSENT_H_
39
40struct proc;
41
b153f746 42typedef int sy_call_t (void *);
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43
44struct sysent { /* system call table */
45 int sy_narg; /* number of arguments */
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46 sy_call_t *sy_call; /* start function */
47 sy_call_t *sy_abort; /* abort function (only if start was async) */
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48};
49
50#define SYF_ARGMASK 0x0000FFFF
51#define SYF_MPSAFE 0x00010000
52
53#define SCARG(p,k) ((p)->k) /* get arg from args pointer */
54 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
55
56struct image_params;
57struct __sigset;
58struct trapframe;
59struct vnode;
60
61struct sysentvec {
62 int sv_size; /* number of entries */
63 struct sysent *sv_table; /* pointer to sysent */
8ec60c3f 64 u_int sv_mask; /* optional mask to index, else -1 */
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65 int sv_sigsize; /* size of signal translation table */
66 int *sv_sigtbl; /* signal translation table */
67 int sv_errsize; /* size of errno translation table */
68 int *sv_errtbl; /* errno translation table */
b153f746 69 int (*sv_transtrap) (int, int);
984263bc 70 /* translate trap-to-signal mapping */
b153f746 71 int (*sv_fixup) (register_t **, struct image_params *);
984263bc 72 /* stack fixup function */
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73 void (*sv_sendsig) (void (*)(int), int,
74 struct __sigset *, u_long);
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75 /* send signal */
76 char *sv_sigcode; /* start of sigtramp code */
77 int *sv_szsigcode; /* size of sigtramp code */
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78 void (*sv_prepsyscall) (struct trapframe *, int *,
79 u_int *, caddr_t *);
984263bc 80 char *sv_name; /* name of binary type */
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81 int (*sv_coredump) (struct proc *, struct vnode *,
82 off_t);
984263bc 83 /* function to dump core, or NULL */
b153f746 84 int (*sv_imgact_try) (struct image_params *);
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85 int sv_minsigstksz; /* minimum signal stack size */
86};
87
88#ifdef _KERNEL
89extern struct sysentvec aout_sysvec;
90extern struct sysent sysent[];
91
92#define NO_SYSCALL (-1)
93
94struct module;
95
96struct syscall_module_data {
97 int (*chainevh)(struct module *, int, void *); /* next handler */
98 void *chainarg; /* arg for next event handler */
99 int *offset; /* offset into sysent */
100 struct sysent *new_sysent; /* new sysent */
101 struct sysent old_sysent; /* old sysent */
102};
103
104#define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
105static struct syscall_module_data name##_syscall_mod = { \
106 evh, arg, offset, new_sysent, { 0, NULL } \
107}; \
108 \
109static moduledata_t name##_mod = { \
110 #name, \
111 syscall_module_handler, \
112 &name##_syscall_mod \
113}; \
114DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
115
116#define SYSCALL_MODULE_HELPER(syscallname) \
117static int syscallname##_syscall = SYS_##syscallname; \
118static struct sysent syscallname##_sysent = { \
df2244e3 119 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg) - \
245e4f17 120 sizeof(union usrmsg)) / sizeof(register_t)), \
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121 (sy_call_t *)& syscallname \
122}; \
123SYSCALL_MODULE(syscallname, \
124 & syscallname##_syscall, & syscallname##_sysent, \
125 NULL, NULL);
126
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127int syscall_register (int *offset, struct sysent *new_sysent,
128 struct sysent *old_sysent);
129int syscall_deregister (int *offset, struct sysent *old_sysent);
130int syscall_module_handler (struct module *mod, int what, void *arg);
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131
132#endif /* _KERNEL */
133
134#endif /* !_SYS_SYSENT_H_ */