pwd/pwd.h

   1 /* Copyright (C) 1991-2014 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      POSIX Standard: 9.2.2 User Database Access      <pwd.h>
  20  */
  21
  22 #ifndef _PWD_H
  23 #define _PWD_H  1
  24
  25 #include <features.h>
  26
  27 __BEGIN_DECLS
  28
  29 #include <bits/types.h>
  30
  31 #define __need_size_t
  32 #include <stddef.h>
  33
  34 #if defined __USE_XOPEN || defined __USE_XOPEN2K
  35 /* The Single Unix specification says that some more types are
  36    available here.  */
  37 # ifndef __gid_t_defined
  38 typedef __gid_t gid_t;
  39 #  define __gid_t_defined
  40 # endif
  41
  42 # ifndef __uid_t_defined
  43 typedef __uid_t uid_t;
  44 #  define __uid_t_defined
  45 # endif
  46 #endif
  47
  48 /* The passwd structure.  */
  49 struct passwd
  50 {
  51   char *pw_name;                /* Username.  */
  52   char *pw_passwd;              /* Password.  */
  53   __uid_t pw_uid;               /* User ID.  */
  54   __gid_t pw_gid;               /* Group ID.  */
  55   char *pw_gecos;               /* Real name.  */
  56   char *pw_dir;                 /* Home directory.  */
  57   char *pw_shell;               /* Shell program.  */
  58 };
  59
  60
  61 #if defined __USE_MISC || defined __USE_GNU
  62 # define __need_FILE
  63 # include <stdio.h>
  64 #endif
  65
  66
  67 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  68 /* Rewind the password-file stream.
  69
  70    This function is a possible cancellation point and therefore not
  71    marked with __THROW.  */
  72 extern void setpwent (void);
  73
  74 /* Close the password-file stream.
  75
  76    This function is a possible cancellation point and therefore not
  77    marked with __THROW.  */
  78 extern void endpwent (void);
  79
  80 /* Read an entry from the password-file stream, opening it if necessary.
  81
  82    This function is a possible cancellation point and therefore not
  83    marked with __THROW.  */
  84 extern struct passwd *getpwent (void);
  85 #endif
  86
  87 #ifdef  __USE_MISC
  88 /* Read an entry from STREAM.
  89
  90    This function is not part of POSIX and therefore no official
  91    cancellation point.  But due to similarity with an POSIX interface
  92    or due to the implementation it is a cancellation point and
  93    therefore not marked with __THROW.  */
  94 extern struct passwd *fgetpwent (FILE *__stream);
  95
  96 /* Write the given entry onto the given stream.
  97
  98    This function is not part of POSIX and therefore no official
  99    cancellation point.  But due to similarity with an POSIX interface
 100    or due to the implementation it is a cancellation point and
 101    therefore not marked with __THROW.  */
 102 extern int putpwent (const struct passwd *__restrict __p,
 103                      FILE *__restrict __f);
 104 #endif
 105
 106 /* Search for an entry with a matching user ID.
 107
 108    This function is a possible cancellation point and therefore not
 109    marked with __THROW.  */
 110 extern struct passwd *getpwuid (__uid_t __uid);
 111
 112 /* Search for an entry with a matching username.
 113
 114    This function is a possible cancellation point and therefore not
 115    marked with __THROW.  */
 116 extern struct passwd *getpwnam (const char *__name);
 117
 118 #if defined __USE_POSIX || defined __USE_MISC
 119
 120 # ifdef __USE_MISC
 121 /* Reasonable value for the buffer sized used in the reentrant
 122    functions below.  But better use `sysconf'.  */
 123 #  define NSS_BUFLEN_PASSWD     1024
 124 # endif
 125
 126 /* Reentrant versions of some of the functions above.
 127
 128    PLEASE NOTE: the `getpwent_r' function is not (yet) standardized.
 129    The interface may change in later versions of this library.  But
 130    the interface is designed following the principals used for the
 131    other reentrant functions so the chances are good this is what the
 132    POSIX people would choose.  */
 133
 134 # ifdef __USE_MISC
 135 /* This function is not part of POSIX and therefore no official
 136    cancellation point.  But due to similarity with an POSIX interface
 137    or due to the implementation it is a cancellation point and
 138    therefore not marked with __THROW.  */
 139 extern int getpwent_r (struct passwd *__restrict __resultbuf,
 140                        char *__restrict __buffer, size_t __buflen,
 141                        struct passwd **__restrict __result);
 142 # endif
 143
 144 extern int getpwuid_r (__uid_t __uid,
 145                        struct passwd *__restrict __resultbuf,
 146                        char *__restrict __buffer, size_t __buflen,
 147                        struct passwd **__restrict __result);
 148
 149 extern int getpwnam_r (const char *__restrict __name,
 150                        struct passwd *__restrict __resultbuf,
 151                        char *__restrict __buffer, size_t __buflen,
 152                        struct passwd **__restrict __result);
 153
 154
 155 # ifdef __USE_MISC
 156 /* Read an entry from STREAM.  This function is not standardized and
 157    probably never will.
 158
 159    This function is not part of POSIX and therefore no official
 160    cancellation point.  But due to similarity with an POSIX interface
 161    or due to the implementation it is a cancellation point and
 162    therefore not marked with __THROW.  */
 163 extern int fgetpwent_r (FILE *__restrict __stream,
 164                         struct passwd *__restrict __resultbuf,
 165                         char *__restrict __buffer, size_t __buflen,
 166                         struct passwd **__restrict __result);
 167 # endif
 168
 169 #endif  /* POSIX or reentrant */
 170
 171 #ifdef __USE_GNU
 172 /* Re-construct the password-file line for the given uid
 173    in the given buffer.  This knows the format that the caller
 174    will expect, but this need not be the format of the password file.
 175
 176    This function is not part of POSIX and therefore no official
 177    cancellation point.  But due to similarity with an POSIX interface
 178    or due to the implementation it is a cancellation point and
 179    therefore not marked with __THROW.  */
 180 extern int getpw (__uid_t __uid, char *__buffer);
 181 #endif
 182
 183 __END_DECLS
 184
 185 #endif /* pwd.h  */