pwd/pwd.h

   1 /* Copyright (C) 1991-2021 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    <https://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 /* A record in the user database.  */
  49 struct passwd
  50 {
  51   char *pw_name;                /* Username.  */
  52   char *pw_passwd;              /* Hashed passphrase, if shadow database
  53                                    not in use (see shadow.h).  */
  54   __uid_t pw_uid;               /* User ID.  */
  55   __gid_t pw_gid;               /* Group ID.  */
  56   char *pw_gecos;               /* Real name.  */
  57   char *pw_dir;                 /* Home directory.  */
  58   char *pw_shell;               /* Shell program.  */
  59 };
  60
  61
  62 #ifdef __USE_MISC
  63 # include <bits/types/FILE.h>
  64 #endif
  65
  66
  67 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  68 /* Rewind the user database 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 user database 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 user database 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 a user database 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) __nonnull ((1));
  95
  96 /* Write a given user database 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 /* Retrieve the user database entry for the given 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 /* Retrieve the user database entry for the given 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) __nonnull ((1));
 117
 118 #ifdef __USE_POSIX
 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     __nonnull ((1, 2, 4))
 143     __attr_access ((__write_only__, 2, 3));
 144 # endif
 145
 146 extern int getpwuid_r (__uid_t __uid,
 147                        struct passwd *__restrict __resultbuf,
 148                        char *__restrict __buffer, size_t __buflen,
 149                        struct passwd **__restrict __result)
 150     __nonnull ((2, 3, 5))
 151     __attr_access ((__write_only__, 3, 4));
 152
 153 extern int getpwnam_r (const char *__restrict __name,
 154                        struct passwd *__restrict __resultbuf,
 155                        char *__restrict __buffer, size_t __buflen,
 156                        struct passwd **__restrict __result)
 157     __nonnull ((1, 2, 3, 5))
 158     __attr_access ((__write_only__, 3, 4));
 159
 160
 161 # ifdef __USE_MISC
 162 /* Read a user database entry from STREAM.  This function is not
 163    standardized and probably never will.
 164
 165    This function is not part of POSIX and therefore no official
 166    cancellation point.  But due to similarity with an POSIX interface
 167    or due to the implementation it is a cancellation point and
 168    therefore not marked with __THROW.  */
 169 extern int fgetpwent_r (FILE *__restrict __stream,
 170                         struct passwd *__restrict __resultbuf,
 171                         char *__restrict __buffer, size_t __buflen,
 172                         struct passwd **__restrict __result)
 173     __nonnull ((1, 2, 3, 5))
 174     __attr_access ((__write_only__, 3, 4));
 175 # endif
 176
 177 #endif  /* POSIX or reentrant */
 178
 179 #ifdef __USE_GNU
 180 /* Write a traditional /etc/passwd line, based on the user database
 181    entry for the given UID, to BUFFER; space for BUFFER must be
 182    allocated by the caller.
 183
 184    This function is not part of POSIX and therefore no official
 185    cancellation point.  But due to similarity with an POSIX interface
 186    or due to the implementation it is a cancellation point and
 187    therefore not marked with __THROW.  */
 188 extern int getpw (__uid_t __uid, char *__buffer);
 189 #endif
 190
 191 __END_DECLS
 192
 193 #endif /* pwd.h  */