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 
   48 #define SYF_ARGMASK     0x0000FFFF
   49 #define SYF_MPSAFE      0x00010000
   50 
   51 #define SCARG(p,k)      ((p)->k)        /* get arg from args pointer */
   52   /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
   53 
   54 struct image_params;
   55 struct __sigset;
   56 struct trapframe;
   57 struct vnode;
   58 
   59 struct sysentvec {
   60         int             sv_size;        /* number of entries */
   61         struct sysent   *sv_table;      /* pointer to sysent */
   62         u_int           sv_mask;        /* optional mask to index */
   63         int             sv_sigsize;     /* size of signal translation table */
   64         int             *sv_sigtbl;     /* signal translation table */
   65         int             sv_errsize;     /* size of errno translation table */
   66         int             *sv_errtbl;     /* errno translation table */
   67         int             (*sv_transtrap) __P((int, int));
   68                                         /* translate trap-to-signal mapping */
   69         int             (*sv_fixup) __P((register_t **, struct image_params *));
   70                                         /* stack fixup function */
   71         void            (*sv_sendsig) __P((void (*)(int), int,
   72                                            struct __sigset *, u_long));
   73                                         /* send signal */
   74         char            *sv_sigcode;    /* start of sigtramp code */
   75         int             *sv_szsigcode;  /* size of sigtramp code */
   76         void            (*sv_prepsyscall) __P((struct trapframe *, int *,
   77                                                u_int *, caddr_t *));
   78         char            *sv_name;       /* name of binary type */
   79         int             (*sv_coredump) __P((struct proc *, struct vnode *,
   80                                             off_t));
   81                                         /* function to dump core, or NULL */
   82         int             (*sv_imgact_try) __P((struct image_params *));
   83         int             sv_minsigstksz; /* minimum signal stack size */
   84 };
   85 
   86 #ifdef _KERNEL
   87 extern struct sysentvec aout_sysvec;
   88 extern struct sysent sysent[];
   89 
   90 #define NO_SYSCALL (-1)
   91 
   92 struct module;
   93 
   94 struct syscall_module_data {
   95        int     (*chainevh)(struct module *, int, void *); /* next handler */
   96        void    *chainarg;      /* arg for next event handler */
   97        int     *offset;         /* offset into sysent */
   98        struct  sysent *new_sysent; /* new sysent */
   99        struct  sysent old_sysent; /* old sysent */
  100 };
  101 
  102 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg)     \
  103 static struct syscall_module_data name##_syscall_mod = {       \
  104        evh, arg, offset, new_sysent, { 0, NULL }               \
  105 };                                                             \
  106                                                                \
  107 static moduledata_t name##_mod = {                             \
  108        #name,                                                  \
  109        syscall_module_handler,                                 \
  110        &name##_syscall_mod                                     \
  111 };                                                             \
  112 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  113 
  114 #define SYSCALL_MODULE_HELPER(syscallname)              \
  115 static int syscallname##_syscall = SYS_##syscallname;   \
  116 static struct sysent syscallname##_sysent = {           \
  117     (sizeof(struct syscallname ## _args )               \
  118      / sizeof(register_t)),                             \
  119     (sy_call_t *)& syscallname                          \
  120 };                                                      \
  121 SYSCALL_MODULE(syscallname,                             \
  122     & syscallname##_syscall, & syscallname##_sysent,    \
  123     NULL, NULL);
  124 
  125 int    syscall_register __P((int *offset, struct sysent *new_sysent,
  126                              struct sysent *old_sysent));
  127 int    syscall_deregister __P((int *offset, struct sysent *old_sysent));
  128 int    syscall_module_handler __P((struct module *mod, int what, void *arg));
  129 
  130 #endif /* _KERNEL */
  131 
  132 #endif /* !_SYS_SYSENT_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/sys/sysent.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/sysent.h