grp/grp.h

   1 /* Copyright (C) 1991, 1992, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      POSIX Standard: 9.2.1 Group Database Access     <grp.h>
  21  */
  22
  23 #ifndef _GRP_H
  24
  25 #define _GRP_H  1
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 #include <gnu/types.h>
  31
  32 #define __need_size_t
  33 #include <stddef.h>
  34
  35
  36 /* The group structure.  */
  37 struct group
  38   {
  39     char *gr_name;              /* Group name.  */
  40     char *gr_passwd;            /* Password.    */
  41     __gid_t gr_gid;             /* Group ID.    */
  42     char **gr_mem;              /* Member list. */
  43   };
  44
  45
  46 #if defined(__USE_SVID) || defined(__USE_GNU)
  47 #define __need_FILE
  48 #include <stdio.h>
  49 #endif
  50
  51 #ifdef  __USE_GNU
  52 /* Return a new stream open on the group file.  */
  53 extern FILE *__grpopen __P ((void));
  54
  55 /* Read a group entry from STREAM, filling in G.
  56    Return the `struct group' of G if successful, NULL on failure.  */
  57 extern struct group *__grpread __P ((FILE *__stream, __ptr_t __g));
  58
  59 /* Return a chunk of memory containing pre-initialized data for __grpread.  */
  60 extern __ptr_t __grpalloc __P ((void));
  61
  62 /* Scan the group file, filling in G, until SELECTOR returns nonzero for an
  63    entry.  Return the `struct group' of G if successful, NULL on failure.  */
  64 extern struct group *__grpscan __P ((__ptr_t *__p,
  65                                      int (*__selector) (struct group *)));
  66 #endif
  67
  68
  69 #if defined(__USE_SVID) || defined(__USE_MISC) || defined (__USE_BSD)
  70 /* Rewind the group-file stream.  */
  71 extern void setgrent __P ((void));
  72
  73 /* Close the group-file stream.  */
  74 extern void endgrent __P ((void));
  75
  76 /* Read an entry from the group-file stream, opening it if necessary.  */
  77 extern struct group *getgrent __P ((void));
  78 #endif
  79
  80 #ifdef  __USE_SVID
  81 /* Read a group entry from STREAM.  */
  82 extern struct group *fgetgrent __P ((FILE *__stream));
  83 #endif
  84
  85 /* Search for an entry with a matching group ID.  */
  86 extern struct group *getgrgid __P ((__gid_t __gid));
  87
  88 /* Search for an entry with a matching group name.  */
  89 extern struct group *getgrnam __P ((__const char *__name));
  90
  91 #ifdef  __USE_REENTRANT
  92 /* Reasonable value for the buffer sized used in the reentrant
  93    functions below.  But better use `sysconf'.  */
  94 #define NSS_BUFLEN_GROUP        1024
  95
  96 /* Reentrant versions of some of the functions above.
  97
  98    PLEASE NOTE: these functions are not yet standardized.  The interface
  99    may change in later versions of this library.  */
 100
 101 #if defined(__USE_SVID) || defined(__USE_MISC) || defined (__USE_BSD)
 102 extern int getgrent_r __P ((struct group *__resultbuf, char *buffer,
 103                             size_t __buflen, struct group **__result));
 104 #endif
 105
 106 /* Search for an entry with a matching group ID.  */
 107 extern int getgrgid_r __P ((__gid_t __gid, struct group *__resultbuf,
 108                             char *buffer, size_t __buflen,
 109                             struct group **__result));
 110
 111 /* Search for an entry with a matching group name.  */
 112 extern int getgrnam_r __P ((__const char *__name, struct group *__resultbuf,
 113                             char *buffer, size_t __buflen,
 114                             struct group **__result));
 115
 116 #ifdef  __USE_SVID
 117 /* Read a group entry from STREAM.  */
 118 extern int __fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
 119                                char *buffer, size_t __buflen,
 120                                struct group **__result));
 121 extern int fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
 122                              char *buffer, size_t __buflen,
 123                              struct group **__result));
 124 #endif
 125
 126 #endif  /* reentrant */
 127
 128
 129 #ifdef  __USE_BSD
 130
 131 #define __need_size_t
 132 #include <stddef.h>
 133
 134 /* Set the group set for the current user to GROUPS (N of them).  */
 135 extern int setgroups __P ((size_t __n, __const __gid_t *__groups));
 136
 137 /* Initialize the group set for the current user
 138    by reading the group database and using all groups
 139    of which USER is a member.  Also include GROUP.  */
 140 extern int initgroups __P ((__const char *__user, __gid_t __group));
 141
 142 #endif /* Use BSD.  */
 143
 144 __END_DECLS
 145
 146 #endif /* grp.h  */