--- /dev/null
+/* Copyright (C) 1996-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* Declaration of types and functions for "shadow" storage of hashed
+ passphrases. The shadow database is like the user database, but is
+ only accessible with special privileges, so that malicious users
+ cannot retrieve everyone else's hashed passphrase to brute-force at
+ their convenience. */
+
+#ifndef _SHADOW_H
+#define _SHADOW_H 1
+
+#include <features.h>
+
+#include <paths.h>
+
+#define __need_size_t
+#include <stddef.h>
+
+#include <bits/types/FILE.h>
+
+/* Paths to the user database files. */
+#define SHADOW _PATH_SHADOW
+
+
+__BEGIN_DECLS
+
+/* A record in the shadow database. */
+struct spwd
+ {
+ char *sp_namp; /* Login name. */
+ char *sp_pwdp; /* Hashed passphrase. */
+ long int sp_lstchg; /* Date of last change. */
+ long int sp_min; /* Minimum number of days between changes. */
+ long int sp_max; /* Maximum number of days between changes. */
+ long int sp_warn; /* Number of days to warn user to change
+ the password. */
+ long int sp_inact; /* Number of days the account may be
+ inactive. */
+ long int sp_expire; /* Number of days since 1970-01-01 until
+ account expires. */
+ unsigned long int sp_flag; /* Reserved. */
+ };
+
+
+/* Open database for reading.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern void setspent (void);
+
+/* Close database.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern void endspent (void);
+
+/* Get next entry from database, perhaps after opening the file.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern struct spwd *getspent (void);
+
+/* Get shadow entry matching NAME.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern struct spwd *getspnam (const char *__name);
+
+/* Read shadow entry from STRING.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern struct spwd *sgetspent (const char *__string);
+
+/* Read next shadow entry from STREAM.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern struct spwd *fgetspent (FILE *__stream);
+
+/* Write line containing shadow entry to stream.
+
+ This function is not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation it is a cancellation point and
+ therefore not marked with __THROW. */
+extern int putspent (const struct spwd *__p, FILE *__stream);
+
+
+#ifdef __USE_MISC
+/* Reentrant versions of some of the functions above.
+
+ These functions are not part of POSIX and therefore no official
+ cancellation point. But due to similarity with an POSIX interface
+ or due to the implementation they are cancellation points and
+ therefore not marked with __THROW. */
+extern int getspent_r (struct spwd *__result_buf, char *__buffer,
+ size_t __buflen, struct spwd **__result);
+
+extern int getspnam_r (const char *__name, struct spwd *__result_buf,
+ char *__buffer, size_t __buflen,
+ struct spwd **__result);
+
+extern int sgetspent_r (const char *__string, struct spwd *__result_buf,
+ char *__buffer, size_t __buflen,
+ struct spwd **__result);
+
+extern int fgetspent_r (FILE *__stream, struct spwd *__result_buf,
+ char *__buffer, size_t __buflen,
+ struct spwd **__result);
+#endif /* misc */
+
+
+/* The simple locking functionality provided here is not suitable for
+ multi-threaded applications. */
+
+/* Request exclusive access to /etc/passwd and /etc/shadow. */
+extern int lckpwdf (void) __THROW;
+
+/* Release exclusive access to /etc/passwd and /etc/shadow. */
+extern int ulckpwdf (void) __THROW;
+
+__END_DECLS
+
+#endif /* shadow.h */
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