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/ucred.h

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    1 /*
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  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  *      @(#)ucred.h     8.4 (Berkeley) 1/9/95
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _SYS_UCRED_H_
   38 #define _SYS_UCRED_H_
   39 
   40 /*
   41  * Credentials.
   42  *
   43  * Please do not inspect cr_uid directly to determine superuserness.
   44  * Only the suser()/suser_xxx() function should be used for this.
   45  */
   46 struct ucred {
   47         u_int   cr_ref;                 /* reference count */
   48         uid_t   cr_uid;                 /* effective user id */
   49         short   cr_ngroups;             /* number of groups */
   50         gid_t   cr_groups[NGROUPS];     /* groups */
   51         struct  uidinfo *cr_uidinfo;    /* per uid resource consumption */
   52 };
   53 #define cr_gid cr_groups[0]
   54 #define NOCRED ((struct ucred *)0)      /* no credential available */
   55 #define FSCRED ((struct ucred *)-1)     /* filesystem credential */
   56 
   57 /*
   58  * This is the external representation of struct ucred, based upon the
   59  * size of a 4.2-RELEASE struct ucred.  There will probably never be
   60  * any need to change the size of this or layout of its used fields.
   61  */
   62 struct xucred {
   63         u_int   cr_version;             /* structure layout version */
   64         uid_t   cr_uid;                 /* effective user id */
   65         short   cr_ngroups;             /* number of groups */
   66         gid_t   cr_groups[NGROUPS];     /* groups */
   67         void    *_cr_unused1;           /* compatibility with old ucred */
   68 };
   69 #define XUCRED_VERSION  0
   70 
   71 #ifdef _KERNEL
   72 
   73 struct proc;
   74 
   75 void            change_euid __P((struct proc *p, uid_t euid));
   76 void            change_ruid __P((struct proc *p, uid_t ruid));
   77 struct ucred    *crcopy __P((struct ucred *cr));
   78 struct ucred    *crdup __P((struct ucred *cr));
   79 void            crfree __P((struct ucred *cr));
   80 struct ucred    *crget __P((void));
   81 void            crhold __P((struct ucred *cr));
   82 void            cru2x __P((struct ucred *cr, struct xucred *xcr));
   83 int             groupmember __P((gid_t gid, struct ucred *cred));
   84 #endif /* _KERNEL */
   85 
   86 #endif /* !_SYS_UCRED_H_ */

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