grp/grp.h

   1 /* Copyright (C) 1991, 92, 95, 96, 97, 98 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 #define _GRP_H  1
  25
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 #include <bits/types.h>
  31
  32 #define __need_size_t
  33 #include <stddef.h>
  34
  35
  36 /* For the Single Unix specification we must define this type here.  */
  37 #if defined __USE_XOPEN && !defined gid_t
  38 typedef __gid_t gid_t;
  39 # define gid_t gid_t
  40 #endif
  41
  42 /* The group structure.  */
  43 struct group
  44   {
  45     char *gr_name;              /* Group name.  */
  46     char *gr_passwd;            /* Password.    */
  47     __gid_t gr_gid;             /* Group ID.    */
  48     char **gr_mem;              /* Member list. */
  49   };
  50
  51
  52 #if defined __USE_SVID || defined __USE_GNU
  53 # define __need_FILE
  54 # include <stdio.h>
  55 #endif
  56
  57
  58 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  59 /* Rewind the group-file stream.  */
  60 extern void setgrent __P ((void));
  61
  62 /* Close the group-file stream.  */
  63 extern void endgrent __P ((void));
  64
  65 /* Read an entry from the group-file stream, opening it if necessary.  */
  66 extern struct group *getgrent __P ((void));
  67 #endif
  68
  69 #ifdef  __USE_SVID
  70 /* Read a group entry from STREAM.  */
  71 extern struct group *fgetgrent __P ((FILE *__stream));
  72 #endif
  73
  74 #ifdef __USE_GNU
  75 /* Write the given entry onto the given stream.  */
  76 extern int putgrent __P ((__const struct group *__p, FILE *__f));
  77 #endif
  78
  79 /* Search for an entry with a matching group ID.  */
  80 extern struct group *getgrgid __P ((__gid_t __gid));
  81
  82 /* Search for an entry with a matching group name.  */
  83 extern struct group *getgrnam __P ((__const char *__name));
  84
  85 #if defined __USE_POSIX || defined __USE_MISC
  86
  87 # ifdef __USE_MISC
  88 /* Reasonable value for the buffer sized used in the reentrant
  89    functions below.  But better use `sysconf'.  */
  90 #  define NSS_BUFLEN_GROUP      1024
  91 # endif
  92
  93 /* Reentrant versions of some of the functions above.
  94
  95    PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
  96    The interface may change in later versions of this library.  But
  97    the interface is designed following the principals used for the
  98    other reentrant functions so the chances are good this is what the
  99    POSIX people would choose.  */
 100
 101 # if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 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.  This function is not standardized
 118    an probably never will.  */
 119 extern int fgetgrent_r __P ((FILE * __stream, struct group *__resultbuf,
 120                              char *buffer, size_t __buflen,
 121                              struct group **__result));
 122 # endif
 123
 124 #endif  /* POSIX or reentrant */
 125
 126
 127 #ifdef  __USE_BSD
 128
 129 # define __need_size_t
 130 # include <stddef.h>
 131
 132 /* Set the group set for the current user to GROUPS (N of them).  */
 133 extern int setgroups __P ((size_t __n, __const __gid_t *__groups));
 134
 135 /* Initialize the group set for the current user
 136    by reading the group database and using all groups
 137    of which USER is a member.  Also include GROUP.  */
 138 extern int initgroups __P ((__const char *__user, __gid_t __group));
 139
 140 #endif /* Use BSD.  */
 141
 142 __END_DECLS
 143
 144 #endif /* grp.h  */