1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/* Internal routines for nss_files.
Copyright (C) 2020-2022 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
<https://www.gnu.org/licenses/>. */
#ifndef _NSS_FILES_H
#define _NSS_FILES_H
#include <nss.h>
#include <stdio.h>
#if IS_IN (libc)
#include <libc-lock.h>
#endif
/* Open PATH for reading, as a data source for nss_files. */
FILE *__nss_files_fopen (const char *path);
libc_hidden_proto (__nss_files_fopen)
/* Read a line from FP, storing it BUF. Strip leading blanks and skip
comments. Sets errno and returns error code on failure. Special
failure: ERANGE means the buffer is too small. The function writes
the original offset to *POFFSET (which can be negative in the case
of non-seekable input). */
int __nss_readline (FILE *fp, char *buf, size_t len, off64_t *poffset);
libc_hidden_proto (__nss_readline)
/* Seek FP to OFFSET. Sets errno and returns error code on failure.
On success, sets errno to ERANGE and returns ERANGE (to indicate
re-reading of the same input line to the caller). If OFFSET is
negative, fail with ESPIPE without seeking. Intended to be used
after parsing data read by __nss_readline failed with ERANGE. */
int __nss_readline_seek (FILE *fp, off64_t offset) attribute_hidden;
/* Handles the result of a parse_line call (as defined by
nss/nss_files/files-parse.c). Adjusts the file offset of FP as
necessary. Returns 0 on success, and updates errno on failure (and
returns that error code). */
int __nss_parse_line_result (FILE *fp, off64_t offset, int parse_line_result);
libc_hidden_proto (__nss_parse_line_result)
/* Per-file data. Used by the *ent functions that need to preserve
state across calls. */
struct nss_files_per_file_data
{
FILE *stream;
#if IS_IN (libc)
/* The size of locks changes between libc and nss_files, so this
member must be last and is only available in libc. */
__libc_lock_define (, lock);
#endif
};
/* File index for __nss_files_data_get. */
enum nss_files_file
{
nss_file_aliasent,
nss_file_etherent,
nss_file_grent,
nss_file_hostent,
nss_file_netent,
nss_file_protoent,
nss_file_pwent,
nss_file_rpcent,
nss_file_servent,
nss_file_sgent,
nss_file_spent,
nss_file_count
};
/* Obtains a pointer to the per-file data for FILE, which is written
to *PDATA, and tries to open the file at PATH for it. On success,
returns NSS_STATUS_SUCCESS, and the caller must later call
__nss_files_data_put. On failure, NSS_STATUS_TRYAGAIN is returned,
and *ERRNOP and *HERRNOP are updated if these pointers are not
null. */
enum nss_status __nss_files_data_open (struct nss_files_per_file_data **pdata,
enum nss_files_file file,
const char *path,
int *errnop, int *herrnop);
libc_hidden_proto (__nss_files_data_open)
/* Unlock the per-file data, previously obtained by
__nss_files_data_open. */
void __nss_files_data_put (struct nss_files_per_file_data *data);
libc_hidden_proto (__nss_files_data_put)
/* Performs the set*ent operation for FILE. PATH is the file to
open. */
enum nss_status __nss_files_data_setent (enum nss_files_file file,
const char *path);
libc_hidden_proto (__nss_files_data_setent)
/* Performs the end*ent operation for FILE. */
enum nss_status __nss_files_data_endent (enum nss_files_file file);
libc_hidden_proto (__nss_files_data_endent)
struct parser_data;
/* Instances of the parse_line function from
nss/nss_files/files-parse.c. */
typedef int nss_files_parse_line (char *line, void *result,
struct parser_data *data,
size_t datalen, int *errnop);
extern nss_files_parse_line _nss_files_parse_etherent;
extern nss_files_parse_line _nss_files_parse_grent;
extern nss_files_parse_line _nss_files_parse_netent;
extern nss_files_parse_line _nss_files_parse_protoent;
extern nss_files_parse_line _nss_files_parse_pwent;
extern nss_files_parse_line _nss_files_parse_rpcent;
extern nss_files_parse_line _nss_files_parse_servent;
extern nss_files_parse_line _nss_files_parse_sgent;
extern nss_files_parse_line _nss_files_parse_spent;
libc_hidden_proto (_nss_files_parse_etherent)
libc_hidden_proto (_nss_files_parse_grent)
libc_hidden_proto (_nss_files_parse_netent)
libc_hidden_proto (_nss_files_parse_protoent)
libc_hidden_proto (_nss_files_parse_pwent)
libc_hidden_proto (_nss_files_parse_rpcent)
libc_hidden_proto (_nss_files_parse_servent)
libc_hidden_proto (_nss_files_parse_sgent)
libc_hidden_proto (_nss_files_parse_spent)
NSS_DECLARE_MODULE_FUNCTIONS (files)
#undef DEFINE_NSS_FUNCTION
#define DEFINE_NSS_FUNCTION(x) libc_hidden_proto (_nss_files_##x)
#include <nss/function.def>
#undef DEFINE_NSS_FUNCTION
void _nss_files_init (void (*cb) (size_t, struct traced_file *));
libc_hidden_proto (_nss_files_init)
/* Generic implementation of fget*ent_r. Reads lines from FP until
EOF or a successful parse into *RESULT using PARSER. Returns 0 on
success, ENOENT on EOF, ERANGE on too-small buffer. */
int __nss_fgetent_r (FILE *fp, void *result,
char *buffer, size_t buffer_length,
nss_files_parse_line parser) attribute_hidden;
#endif /* _NSS_FILES_H */
|
