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

     /*
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)ucred.h     8.4 (Berkeley) 1/9/95
     * $FreeBSD: src/sys/sys/ucred.h,v 1.14.2.5 2002/03/09 05:20:25 dd Exp $
     * $DragonFly: src/sys/sys/ucred.h,v 1.9 2007/01/08 21:32:57 corecode Exp $
     */
    
    #ifndef _SYS_UCRED_H_
    #define _SYS_UCRED_H_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #ifndef _SYS_PARAM_H_
    #include <sys/param.h>
    #endif
    #ifndef _SYS_SPINLOCK_H_
    #include <sys/spinlock.h>
    #endif
    
    struct prison;
    
    /*
     * Credentials.
     *
     * Please do not inspect cr_uid directly to determine superuserness.
     * Only the priv(9) functions should be used for this.
     */
    struct ucred {
            int     cr_ref;                 /* reference count */
            uid_t   cr_uid;                 /* effective user id */
            short   cr_ngroups;             /* number of groups */
            gid_t   cr_groups[NGROUPS];     /* groups */
            struct  uidinfo *cr_uidinfo;    /* per uid resource consumption */
            struct  uidinfo *cr_ruidinfo;   /* per ruid resource consumption */
            struct  prison *cr_prison;      /* prison info */
            uid_t   cr_ruid;                /* Real user id. */
            uid_t   cr_svuid;               /* Saved effective user id. */
            gid_t   cr_rgid;                /* Real group id. */
            gid_t   cr_svgid;               /* Saved effective group id. */
    };
    #define cr_gid cr_groups[0]
    #define NOCRED ((struct ucred *)0)      /* no credential available */
    #define FSCRED ((struct ucred *)-1)     /* filesystem credential */
    
    /*
     * This is the external representation of struct ucred, based upon the
     * size of a 4.2-RELEASE struct ucred.  There will probably never be
     * any need to change the size of this or layout of its used fields.
     */
    struct xucred {
            u_int   cr_version;             /* structure layout version */
            uid_t   cr_uid;                 /* effective user id */
            short   cr_ngroups;             /* number of groups */
            gid_t   cr_groups[NGROUPS];     /* groups */
            void    *_cr_unused1;           /* compatibility with old ucred */
    };
    #define XUCRED_VERSION  0
    
    #ifdef _KERNEL
    
    struct proc;
    
    struct ucred    *change_euid (uid_t euid);
    struct ucred    *change_ruid (uid_t ruid);
    struct ucred    *cratom (struct ucred **pcr);
    struct ucred    *crcopy (struct ucred *cr);
    struct ucred    *crdup (struct ucred *cr);
    void            crfree (struct ucred *cr);
   void            crinit (struct ucred *cr);
   struct ucred    *crget (void);
   struct ucred    *crhold (struct ucred *cr);
   void            cru2x (struct ucred *cr, struct xucred *xcr);
   int             groupmember (gid_t gid, struct ucred *cred);
   #endif /* _KERNEL */
   
   #endif /* !_SYS_UCRED_H_ */

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