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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/6.4/sys/sys/sysent.h 169911 2007-05-23 18:24:43Z jhb $
   30  */
   31 
   32 #ifndef _SYS_SYSENT_H_
   33 #define _SYS_SYSENT_H_
   34 
   35 #include <bsm/audit.h>
   36 
   37 struct rlimit;
   38 struct thread;
   39 
   40 typedef int     sy_call_t(struct thread *, void *);
   41 
   42 struct sysent {         /* system call table */
   43         int     sy_narg;        /* number of arguments */
   44         sy_call_t *sy_call;     /* implementing function */
   45         au_event_t sy_auevent;  /* audit event associated with syscall */
   46 };
   47 
   48 #define SYF_ARGMASK     0x0000FFFF
   49 #define SYF_MPSAFE      0x00010000
   50 
   51 struct image_params;
   52 struct __sigset;
   53 struct trapframe;
   54 struct vnode;
   55 
   56 struct sysentvec {
   57         int             sv_size;        /* number of entries */
   58         struct sysent   *sv_table;      /* pointer to sysent */
   59         u_int           sv_mask;        /* optional mask to index */
   60         int             sv_sigsize;     /* size of signal translation table */
   61         int             *sv_sigtbl;     /* signal translation table */
   62         int             sv_errsize;     /* size of errno translation table */
   63         int             *sv_errtbl;     /* errno translation table */
   64         int             (*sv_transtrap)(int, int);
   65                                         /* translate trap-to-signal mapping */
   66         int             (*sv_fixup)(register_t **, struct image_params *);
   67                                         /* stack fixup function */
   68         void            (*sv_sendsig)(void (*)(int), int, struct __sigset *,
   69                             u_long);    /* send signal */
   70         char            *sv_sigcode;    /* start of sigtramp code */
   71         int             *sv_szsigcode;  /* size of sigtramp code */
   72         void            (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
   73                             caddr_t *);
   74         char            *sv_name;       /* name of binary type */
   75         int             (*sv_coredump)(struct thread *, struct vnode *, off_t);
   76                                         /* function to dump core, or NULL */
   77         int             (*sv_imgact_try)(struct image_params *);
   78         int             sv_minsigstksz; /* minimum signal stack size */
   79         int             sv_pagesize;    /* pagesize */
   80         vm_offset_t     sv_minuser;     /* VM_MIN_ADDRESS */
   81         vm_offset_t     sv_maxuser;     /* VM_MAXUSER_ADDRESS */
   82         vm_offset_t     sv_usrstack;    /* USRSTACK */
   83         vm_offset_t     sv_psstrings;   /* PS_STRINGS */
   84         int             sv_stackprot;   /* vm protection for stack */
   85         register_t      *(*sv_copyout_strings)(struct image_params *);
   86         void            (*sv_setregs)(struct thread *, u_long, u_long, u_long);
   87         void            (*sv_fixlimit)(struct rlimit *, int);
   88 };
   89 
   90 #ifdef _KERNEL
   91 extern struct sysentvec aout_sysvec;
   92 extern struct sysentvec elf_freebsd_sysvec;
   93 extern struct sysentvec null_sysvec;
   94 extern struct sysent sysent[];
   95 
   96 #define NO_SYSCALL (-1)
   97 
   98 struct module;
   99 
  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 */
  106 };
  107 
  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 }               \
  111 };                                                             \
  112                                                                \
  113 static moduledata_t name##_mod = {                             \
  114        #name,                                                  \
  115        syscall_module_handler,                                 \
  116        &name##_syscall_mod                                     \
  117 };                                                             \
  118 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
  119 
  120 #define SYSCALL_MODULE_HELPER(syscallname)              \
  121 static int syscallname##_syscall = SYS_##syscallname;   \
  122 static struct sysent syscallname##_sysent = {           \
  123     (sizeof(struct syscallname ## _args )               \
  124      / sizeof(register_t)),                             \
  125     (sy_call_t *)& syscallname                          \
  126 };                                                      \
  127 SYSCALL_MODULE(syscallname,                             \
  128     & syscallname##_syscall, & syscallname##_sysent,    \
  129     NULL, NULL);
  130 
  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);
  135 
  136 #endif /* _KERNEL */
  137 
  138 #endif /* !_SYS_SYSENT_H_ */

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