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29 * $FreeBSD: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $
30 * $DragonFly: src/sys/sys/sysent.h,v 1.12 2007/02/21 15:45:37 corecode Exp $
33 #ifndef _SYS_SYSENT_H_
34 #define _SYS_SYSENT_H_
37 #include <sys/types.h>
43 typedef int sy_call_t (struct sysmsg *sysmsg, const void *);
45 struct sysent { /* system call table */
46 int sy_narg; /* number of arguments */
47 sy_call_t *sy_call; /* start function */
48 sy_call_t *sy_abort; /* abort function (only if start was async) */
51 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */
52 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
60 int sv_size; /* number of entries */
61 struct sysent *sv_table; /* pointer to sysent */
62 int sv_sigsize; /* size of signal translation table */
63 int *sv_sigtbl; /* signal translation table */
64 int sv_errsize; /* size of errno translation table */
65 int *sv_errtbl; /* errno translation table */
66 int (*sv_transtrap) (int, int);
67 /* translate trap-to-signal mapping */
68 int (*sv_fixup) (register_t **, struct image_params *);
69 /* stack fixup function */
70 void (*sv_sendsig) (void (*)(int), int,
71 struct __sigset *, u_long);
73 char *sv_sigcode; /* start of sigtramp code */
74 int *sv_szsigcode; /* size of sigtramp code */
75 /* prep syscall (must be MPSAFE) */
76 char *sv_name; /* name of binary type */
77 int (*sv_coredump) (struct lwp *, int, struct vnode *,
79 /* function to dump core, or NULL */
80 int (*sv_imgact_try) (struct image_params *);
81 int sv_minsigstksz; /* minimum signal stack size */
85 extern struct sysentvec aout_sysvec;
86 extern struct sysent sysent[];
88 #define NO_SYSCALL (-1)
92 struct syscall_module_data {
93 int (*chainevh)(struct module *, int, void *); /* next handler */
94 void *chainarg; /* arg for next event handler */
95 int *offset; /* offset into sysent */
96 struct sysent *new_sysent; /* new sysent */
97 struct sysent old_sysent; /* old sysent */
100 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
101 static struct syscall_module_data name##_syscall_mod = { \
102 evh, arg, offset, new_sysent, { 0, NULL } \
105 static moduledata_t name##_mod = { \
107 syscall_module_handler, \
108 &name##_syscall_mod \
110 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
112 #define SYSCALL_MODULE_HELPER(syscallname) \
113 static int syscallname##_syscall = SYS_##syscallname; \
114 static struct sysent syscallname##_sysent = { \
115 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg)) \
116 / sizeof(register_t)), \
117 (sy_call_t *)& syscallname \
119 SYSCALL_MODULE(syscallname, \
120 & syscallname##_syscall, & syscallname##_sysent, \
123 int syscall_register (int *offset, struct sysent *new_sysent,
124 struct sysent *old_sysent);
125 int syscall_deregister (int *offset, struct sysent *old_sysent);
126 int syscall_module_handler (struct module *mod, int what, void *arg);
130 #endif /* !_SYS_SYSENT_H_ */