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[glibc.git] / pwd / pwd.h
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1 /* Copyright (C) 1991,1992,1995-2001,2003,2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
20 * POSIX Standard: 9.2.2 User Database Access <pwd.h>
23 #ifndef _PWD_H
24 #define _PWD_H 1
26 #include <features.h>
28 __BEGIN_DECLS
30 #include <bits/types.h>
32 #define __need_size_t
33 #include <stddef.h>
35 #if defined __USE_XOPEN || defined __USE_XOPEN2K
36 /* The Single Unix specification says that some more types are
37 available here. */
38 # ifndef __gid_t_defined
39 typedef __gid_t gid_t;
40 # define __gid_t_defined
41 # endif
43 # ifndef __uid_t_defined
44 typedef __uid_t uid_t;
45 # define __uid_t_defined
46 # endif
47 #endif
49 /* The passwd structure. */
50 struct passwd
52 char *pw_name; /* Username. */
53 char *pw_passwd; /* Password. */
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. */
62 #if defined __USE_SVID || defined __USE_GNU
63 # define __need_FILE
64 # include <stdio.h>
65 #endif
68 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN_EXTENDED
69 /* Rewind the password-file stream.
71 This function is a possible cancellation point and therefore not
72 marked with __THROW. */
73 extern void setpwent (void);
75 /* Close the password-file stream.
77 This function is a possible cancellation point and therefore not
78 marked with __THROW. */
79 extern void endpwent (void);
81 /* Read an entry from the password-file stream, opening it if necessary.
83 This function is a possible cancellation point and therefore not
84 marked with __THROW. */
85 extern struct passwd *getpwent (void);
86 #endif
88 #ifdef __USE_SVID
89 /* Read an entry from STREAM.
91 This function is not part of POSIX and therefore no official
92 cancellation point. But due to similarity with an POSIX interface
93 or due to the implementation it is a cancellation point and
94 therefore not marked with __THROW. */
95 extern struct passwd *fgetpwent (FILE *__stream);
97 /* Write the given entry onto the given stream.
99 This function is not part of POSIX and therefore no official
100 cancellation point. But due to similarity with an POSIX interface
101 or due to the implementation it is a cancellation point and
102 therefore not marked with __THROW. */
103 extern int putpwent (__const struct passwd *__restrict __p,
104 FILE *__restrict __f);
105 #endif
107 /* Search for an entry with a matching user ID.
109 This function is a possible cancellation point and therefore not
110 marked with __THROW. */
111 extern struct passwd *getpwuid (__uid_t __uid);
113 /* Search for an entry with a matching username.
115 This function is a possible cancellation point and therefore not
116 marked with __THROW. */
117 extern struct passwd *getpwnam (__const char *__name);
119 #if defined __USE_POSIX || defined __USE_MISC
121 # ifdef __USE_MISC
122 /* Reasonable value for the buffer sized used in the reentrant
123 functions below. But better use `sysconf'. */
124 # define NSS_BUFLEN_PASSWD 1024
125 # endif
127 /* Reentrant versions of some of the functions above.
129 PLEASE NOTE: the `getpwent_r' function is not (yet) standardized.
130 The interface may change in later versions of this library. But
131 the interface is designed following the principals used for the
132 other reentrant functions so the chances are good this is what the
133 POSIX people would choose. */
135 # if defined __USE_SVID || defined __USE_MISC
136 /* This function is not part of POSIX and therefore no official
137 cancellation point. But due to similarity with an POSIX interface
138 or due to the implementation it is a cancellation point and
139 therefore not marked with __THROW. */
140 extern int getpwent_r (struct passwd *__restrict __resultbuf,
141 char *__restrict __buffer, size_t __buflen,
142 struct passwd **__restrict __result);
143 # endif
145 extern int getpwuid_r (__uid_t __uid,
146 struct passwd *__restrict __resultbuf,
147 char *__restrict __buffer, size_t __buflen,
148 struct passwd **__restrict __result);
150 extern int getpwnam_r (__const char *__restrict __name,
151 struct passwd *__restrict __resultbuf,
152 char *__restrict __buffer, size_t __buflen,
153 struct passwd **__restrict __result);
156 # ifdef __USE_SVID
157 /* Read an entry from STREAM. This function is not standardized and
158 probably never will.
160 This function is not part of POSIX and therefore no official
161 cancellation point. But due to similarity with an POSIX interface
162 or due to the implementation it is a cancellation point and
163 therefore not marked with __THROW. */
164 extern int fgetpwent_r (FILE *__restrict __stream,
165 struct passwd *__restrict __resultbuf,
166 char *__restrict __buffer, size_t __buflen,
167 struct passwd **__restrict __result);
168 # endif
170 #endif /* POSIX or reentrant */
172 #ifdef __USE_GNU
173 /* Re-construct the password-file line for the given uid
174 in the given buffer. This knows the format that the caller
175 will expect, but this need not be the format of the password file.
177 This function is not part of POSIX and therefore no official
178 cancellation point. But due to similarity with an POSIX interface
179 or due to the implementation it is a cancellation point and
180 therefore not marked with __THROW. */
181 extern int getpw (__uid_t __uid, char *__buffer);
182 #endif
184 __END_DECLS
186 #endif /* pwd.h */