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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, 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 #define __need_size_t
  36 #include <stddef.h>
  37
  38
  39 /* The group structure.  */
  40 struct group
  41   {
  42     char *gr_name;              /* Group name.  */
  43     char *gr_passwd;            /* Password.    */
  44     __gid_t gr_gid;             /* Group ID.    */
  45     char **gr_mem;              /* Member list. */
  46   };
  47
  48
  49 #if defined(__USE_SVID) || defined(__USE_GNU)
  50 #define __need_FILE
  51 #include <stdio.h>
  52 #endif
  53
  54 #ifdef  __USE_GNU
  55 /* Return a new stream open on the group file.  */
  56 extern FILE *__grpopen __P ((void));
  57
  58 /* Read a group entry from STREAM, filling in G.
  59    Return the `struct group' of G if successful, NULL on failure.  */
  60 extern struct group *__grpread __P ((FILE *__stream, __ptr_t __g));
  61
  62 /* Return a chunk of memory containing pre-initialized data for __grpread.  */
  63 extern __ptr_t __grpalloc __P ((void));
  64
  65 /* Scan the group file, filling in G, until SELECTOR returns nonzero for an
  66    entry.  Return the `struct group' of G if successful, NULL on failure.  */
  67 extern struct group *__grpscan __P ((__ptr_t *__p,
  68                                      int (*__selector) (struct group *)));
  69 #endif
  70
  71
  72 #if defined(__USE_SVID) || defined (__USE_BSD) || defined(__USE_XOPEN_EXTENDED)
  73 /* Rewind the group-file stream.  */
  74 extern void setgrent __P ((void));
  75
  76 /* Close the group-file stream.  */
  77 extern void endgrent __P ((void));
  78
  79 /* Read an entry from the group-file stream, opening it if necessary.  */
  80 extern struct group *getgrent __P ((void));
  81 #endif
  82
  83 #ifdef  __USE_SVID
  84 /* Read a group entry from STREAM.  */
  85 extern struct group *fgetgrent __P ((FILE *__stream));
  86 #endif
  87
  88 /* Search for an entry with a matching group ID.  */
  89 extern struct group *getgrgid __P ((__gid_t __gid));
  90
  91 /* Search for an entry with a matching group name.  */
  92 extern struct group *getgrnam __P ((__const char *__name));
  93
  94 #ifdef  __USE_REENTRANT
  95 /* Reasonable value for the buffer sized used in the reentrant
  96    functions below.  But better use `sysconf'.  */
  97 #define NSS_BUFLEN_GROUP        1024
  98
  99 /* Reentrant versions of some of the functions above.
 100
 101    PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
 102    The interface may change in later versions of this library.  But
 103    the interface is designed following the principals used for the
 104    other reentrant functions so the chances are good this is what the
 105    POSIX people would choose.  */
 106
 107 #if defined(__USE_SVID) || defined (__USE_BSD) || defined(__USE_XOPEN_EXTENDED)
 108 extern int getgrent_r __P ((struct group *__resultbuf, char *buffer,
 109                             size_t __buflen, struct group **__result));
 110 #endif
 111
 112 /* Search for an entry with a matching group ID.  */
 113 extern int getgrgid_r __P ((__gid_t __gid, struct group *__resultbuf,
 114                             char *buffer, size_t __buflen,
 115                             struct group **__result));
 116
 117 /* Search for an entry with a matching group name.  */
 118 extern int getgrnam_r __P ((__const char *__name, struct group *__resultbuf,
 119                             char *buffer, size_t __buflen,
 120                             struct group **__result));
 121
 122 #ifdef  __USE_SVID
 123 /* Read a group entry from STREAM.  This function is not standardized
 124    an probably never will.  */
 125 extern int __fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
 126                                char *buffer, size_t __buflen,
 127                                struct group **__result));
 128 extern int fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
 129                              char *buffer, size_t __buflen,
 130                              struct group **__result));
 131 #endif
 132
 133 #endif  /* reentrant */
 134
 135
 136 #ifdef  __USE_BSD
 137
 138 #define __need_size_t
 139 #include <stddef.h>
 140
 141 /* Set the group set for the current user to GROUPS (N of them).  */
 142 extern int setgroups __P ((size_t __n, __const __gid_t *__groups));
 143
 144 /* Initialize the group set for the current user
 145    by reading the group database and using all groups
 146    of which USER is a member.  Also include GROUP.  */
 147 extern int initgroups __P ((__const char *__user, __gid_t __group));
 148
 149 #endif /* Use BSD.  */
 150
 151 __END_DECLS
 152
 153 #endif /* grp.h  */