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33 * $FreeBSD: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $
34 * $DragonFly: src/sys/sys/sysent.h,v 1.12 2007/02/21 15:45:37 corecode Exp $
37 #ifndef _SYS_SYSENT_H_
38 #define _SYS_SYSENT_H_
41 #include <sys/types.h>
46 typedef int sy_call_t (void *);
48 struct sysent { /* system call table */
49 int sy_narg; /* number of arguments */
50 sy_call_t *sy_call; /* start function */
51 sy_call_t *sy_abort; /* abort function (only if start was async) */
54 #define SYF_ARGMASK 0x0000FFFF
56 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */
57 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
65 int sv_size; /* number of entries */
66 struct sysent *sv_table; /* pointer to sysent */
67 u_int sv_mask; /* optional mask to index, else -1 */
68 int sv_sigsize; /* size of signal translation table */
69 int *sv_sigtbl; /* signal translation table */
70 int sv_errsize; /* size of errno translation table */
71 int *sv_errtbl; /* errno translation table */
72 int (*sv_transtrap) (int, int);
73 /* translate trap-to-signal mapping */
74 int (*sv_fixup) (register_t **, struct image_params *);
75 /* stack fixup function */
76 void (*sv_sendsig) (void (*)(int), int,
77 struct __sigset *, u_long);
79 char *sv_sigcode; /* start of sigtramp code */
80 int *sv_szsigcode; /* size of sigtramp code */
81 /* prep syscall (must be MPSAFE) */
82 void (*sv_prepsyscall) (struct trapframe *, int *,
84 char *sv_name; /* name of binary type */
85 int (*sv_coredump) (struct lwp *, int, struct vnode *,
87 /* function to dump core, or NULL */
88 int (*sv_imgact_try) (struct image_params *);
89 int sv_minsigstksz; /* minimum signal stack size */
93 extern struct sysentvec aout_sysvec;
94 extern struct sysent sysent[];
96 #define NO_SYSCALL (-1)
100 struct syscall_module_data {
101 int (*chainevh)(struct module *, int, void *); /* next handler */
102 void *chainarg; /* arg for next event handler */
103 int *offset; /* offset into sysent */
104 struct sysent *new_sysent; /* new sysent */
105 struct sysent old_sysent; /* old sysent */
108 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
109 static struct syscall_module_data name##_syscall_mod = { \
110 evh, arg, offset, new_sysent, { 0, NULL } \
113 static moduledata_t name##_mod = { \
115 syscall_module_handler, \
116 &name##_syscall_mod \
118 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
120 #define SYSCALL_MODULE_HELPER(syscallname) \
121 static int syscallname##_syscall = SYS_##syscallname; \
122 static struct sysent syscallname##_sysent = { \
123 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg)) \
124 / sizeof(register_t)), \
125 (sy_call_t *)& syscallname \
127 SYSCALL_MODULE(syscallname, \
128 & syscallname##_syscall, & syscallname##_sysent, \
131 int syscall_register (int *offset, struct sysent *new_sysent,
132 struct sysent *old_sysent);
133 int syscall_deregister (int *offset, struct sysent *old_sysent);
134 int syscall_module_handler (struct module *mod, int what, void *arg);
138 #endif /* !_SYS_SYSENT_H_ */