The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
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  * $FreeBSD$
   34  */
   35 
   36 #ifndef _SYS_SYSENT_H_
   37 #define _SYS_SYSENT_H_
   38 
   39 struct proc;
   40 
   41 typedef int     sy_call_t __P((struct proc *, void *));
   42 
   43 struct sysent {         /* system call table */
   44         int     sy_narg;        /* number of arguments */
   45         sy_call_t *sy_call;     /* implementing function */
   46 };
   47 #define SCARG(p,k)      ((p)->k)        /* get arg from args pointer */
   48   /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
   49 
   50 struct image_params;
   51 struct trapframe;
   52 
   53 struct sysentvec {
   54         int             sv_size;        /* number of entries */
   55         struct sysent   *sv_table;      /* pointer to sysent */
   56         u_int           sv_mask;        /* optional mask to index */
   57         int             sv_sigsize;     /* size of signal translation table */
   58         int             *sv_sigtbl;     /* signal translation table */
   59         int             sv_errsize;     /* size of errno translation table */
   60         int             *sv_errtbl;     /* errno translation table */
   61         int             (*sv_transtrap) __P((int, int));
   62                                         /* translate trap-to-signal mapping */
   63         int             (*sv_fixup) __P((long **, struct image_params *));
   64                                         /* stack fixup function */
   65         void            (*sv_sendsig) __P((void (*)(int), int, int, u_long));
   66                                         /* send signal */
   67         char            *sv_sigcode;    /* start of sigtramp code */
   68         int             *sv_szsigcode;  /* size of sigtramp code */
   69         void            (*sv_prepsyscall) __P((struct trapframe *, int *,
   70                                                u_int *, caddr_t *));
   71         char            *sv_name;       /* name of binary type */
   72         int             (*sv_coredump) __P((struct proc *p, struct vnode *, off_t));
   73                                         /* function to dump core, or NULL */
   74 };
   75 
   76 #ifdef KERNEL
   77 extern struct sysentvec aout_sysvec;
   78 extern struct sysent sysent[];
   79 
   80 #define NO_SYSCALL (-1)
   81 
   82 struct module;
   83 
   84 struct syscall_module_data {
   85        int     (*chainevh)(struct module *, int, void *); /* next handler */
   86        void    *chainarg;      /* arg for next event handler */
   87        int     *offset;         /* offset into sysent */
   88        struct  sysent *new_sysent; /* new sysent */
   89        struct  sysent old_sysent; /* old sysent */
   90 };
   91 
   92 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg)     \
   93 static struct syscall_module_data name##_syscall_mod = {       \
   94        evh, arg, offset, new_sysent                            \
   95 };                                                             \
   96                                                                \
   97 static moduledata_t name##_mod = {                             \
   98        #name,                                                  \
   99        syscall_module_handler,                                 \
  100        &name##_syscall_mod                                     \
  101 };                                                             \
  102 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  103 
  104 int    syscall_register __P((int *offset, struct sysent *new_sysent,
  105                              struct sysent *old_sysent));
  106 int    syscall_deregister __P((int *offset, struct sysent *old_sysent));
  107 int    syscall_module_handler __P((struct module *mod, int what, void *arg));
  108 
  109 #endif /* KERNEL */
  110 
  111 #endif /* !_SYS_SYSENT_H_ */

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