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sourceware.org Git - glibc.git/blob - gshadow/sgetsgent.c
1 /* Copyright (C) 2009 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, see
16 <http://www.gnu.org/licenses/>. */
19 #include <bits/libc-lock.h>
24 /* A reasonable size for a buffer to start with. */
25 #define BUFLEN_SPWD 1024
27 /* We need to protect the dynamic buffer handling. */
28 __libc_lock_define_initialized (static, lock
);
30 /* Read one shadow entry from the given stream. */
32 sgetsgent (const char *string
)
35 static size_t buffer_size
;
36 static struct sgrp resbuf
;
41 __libc_lock_lock (lock
);
43 /* Allocate buffer if not yet available. */
46 buffer_size
= BUFLEN_SPWD
;
47 buffer
= malloc (buffer_size
);
51 && __sgetsgent_r (string
, &resbuf
, buffer
, buffer_size
, &result
) != 0
55 buffer_size
+= BUFLEN_SPWD
;
56 new_buf
= realloc (buffer
, buffer_size
);
59 /* We are out of memory. Free the current buffer so that the
60 process gets a chance for a normal termination. */
71 /* Release lock. Preserve error value. */
73 __libc_lock_unlock (lock
);
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