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60da9d95 NA |
1 | /* Simple subrs. |
2 | Copyright (C) 2019 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of libctf. | |
5 | ||
6 | libctf is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
14 | See the GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; see the file COPYING. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <ctf-impl.h> | |
21 | #ifdef HAVE_MMAP | |
22 | #include <sys/mman.h> | |
23 | #endif | |
24 | #include <sys/types.h> | |
25 | #include <stdarg.h> | |
26 | #include <string.h> | |
27 | #include <unistd.h> | |
28 | ||
29 | static size_t _PAGESIZE _libctf_unused_; | |
6c33b742 | 30 | int _libctf_version = CTF_VERSION; /* Library client version. */ |
60da9d95 NA |
31 | int _libctf_debug = 0; /* Debugging messages enabled. */ |
32 | ||
33 | _libctf_malloc_ void * | |
34 | ctf_data_alloc (size_t size) | |
35 | { | |
36 | void *ret; | |
37 | ||
38 | #ifdef HAVE_MMAP | |
39 | if (_PAGESIZE == 0) | |
40 | _PAGESIZE = sysconf(_SC_PAGESIZE); | |
41 | ||
42 | if (size > _PAGESIZE) | |
43 | { | |
44 | ret = mmap (NULL, size, PROT_READ | PROT_WRITE, | |
45 | MAP_PRIVATE | MAP_ANON, -1, 0); | |
46 | if (ret == MAP_FAILED) | |
47 | ret = NULL; | |
48 | } | |
49 | else | |
50 | ret = calloc (1, size); | |
51 | #else | |
52 | ret = calloc (1, size); | |
53 | #endif | |
54 | return ret; | |
55 | } | |
56 | ||
57 | void | |
58 | ctf_data_free (void *buf, size_t size _libctf_unused_) | |
59 | { | |
60 | #ifdef HAVE_MMAP | |
61 | /* Must be the same as the check in ctf_data_alloc(). */ | |
62 | ||
63 | if (size > _PAGESIZE) | |
64 | (void) munmap (buf, size); | |
65 | else | |
66 | free (buf); | |
67 | #else | |
68 | free (buf); | |
69 | #endif | |
70 | } | |
71 | ||
72 | /* Private, read-only mmap from a file, with fallback to copying. | |
73 | ||
74 | No handling of page-offset issues at all: the caller must allow for that. */ | |
75 | ||
76 | _libctf_malloc_ void * | |
77 | ctf_mmap (size_t length, size_t offset, int fd) | |
78 | { | |
79 | void *data; | |
80 | ||
81 | #ifdef HAVE_MMAP | |
82 | data = mmap (NULL, length, PROT_READ, MAP_PRIVATE, fd, offset); | |
83 | if (data == MAP_FAILED) | |
84 | data = NULL; | |
85 | #else | |
86 | if ((data = malloc (length)) != NULL) | |
87 | { | |
88 | if (ctf_pread (fd, data, length, offset) <= 0) | |
89 | { | |
90 | free (data); | |
91 | data = NULL; | |
92 | } | |
93 | } | |
94 | #endif | |
95 | return data; | |
96 | } | |
97 | ||
98 | void | |
99 | ctf_munmap (void *buf, size_t length _libctf_unused_) | |
100 | { | |
101 | #ifdef HAVE_MMAP | |
102 | (void) munmap (buf, length); | |
103 | #else | |
104 | free (buf); | |
105 | #endif | |
106 | } | |
107 | ||
108 | void | |
109 | ctf_data_protect (void *buf, size_t size) | |
110 | { | |
111 | #ifdef HAVE_MMAP | |
112 | /* Must be the same as the check in ctf_data_alloc(). */ | |
113 | ||
114 | if (size > _PAGESIZE) | |
115 | (void) mprotect (buf, size, PROT_READ); | |
116 | #endif | |
117 | } | |
118 | ||
119 | _libctf_malloc_ void * | |
120 | ctf_alloc (size_t size) | |
121 | { | |
122 | return (malloc (size)); | |
123 | } | |
124 | ||
125 | void | |
126 | ctf_free (void *buf) | |
127 | { | |
128 | free (buf); | |
129 | } | |
130 | ||
131 | ssize_t | |
132 | ctf_pread (int fd, void *buf, ssize_t count, off_t offset) | |
133 | { | |
134 | ssize_t len; | |
135 | size_t acc = 0; | |
136 | char *data = (char *) buf; | |
137 | ||
138 | #ifdef HAVE_PREAD | |
139 | while (count > 0) | |
140 | { | |
141 | errno = 0; | |
142 | if (((len = pread (fd, data, count, offset)) < 0) && | |
143 | errno != EINTR) | |
144 | return len; | |
145 | if (errno == EINTR) | |
146 | continue; | |
147 | ||
148 | acc += len; | |
149 | if (len == 0) /* EOF. */ | |
150 | return acc; | |
151 | ||
152 | count -= len; | |
153 | offset += len; | |
154 | data += len; | |
155 | } | |
156 | return acc; | |
157 | #else | |
158 | off_t orig_off; | |
159 | ||
160 | if ((orig_off = lseek (fd, 0, SEEK_CUR)) < 0) | |
161 | return -1; | |
162 | if ((lseek (fd, offset, SEEK_SET)) < 0) | |
163 | return -1; | |
164 | ||
165 | while (count > 0) | |
166 | { | |
167 | errno = 0; | |
168 | if (((len = read (fd, data, count)) < 0) && | |
169 | errno != EINTR) | |
170 | return len; | |
171 | if (errno == EINTR) | |
172 | continue; | |
173 | ||
174 | acc += len; | |
175 | if (len == 0) /* EOF. */ | |
176 | break; | |
177 | ||
178 | count -= len; | |
179 | data += len; | |
180 | } | |
181 | if ((lseek (fd, orig_off, SEEK_SET)) < 0) | |
182 | return -1; /* offset is smashed. */ | |
183 | #endif | |
184 | ||
185 | return acc; | |
186 | } | |
187 | ||
188 | const char * | |
189 | ctf_strerror (int err) | |
190 | { | |
191 | return (const char *) (strerror (err)); | |
192 | } | |
193 | ||
6c33b742 NA |
194 | /* Set the CTF library client version to the specified version. If version is |
195 | zero, we just return the default library version number. */ | |
196 | int | |
197 | ctf_version (int version) | |
198 | { | |
199 | if (version < 0) | |
200 | { | |
201 | errno = EINVAL; | |
202 | return -1; | |
203 | } | |
204 | ||
205 | if (version > 0) | |
206 | { | |
207 | /* Dynamic version switching is not presently supported. */ | |
208 | if (version != CTF_VERSION) | |
209 | { | |
210 | errno = ENOTSUP; | |
211 | return -1; | |
212 | } | |
213 | ctf_dprintf ("ctf_version: client using version %d\n", version); | |
214 | _libctf_version = version; | |
215 | } | |
216 | ||
217 | return _libctf_version; | |
218 | } | |
219 | ||
60da9d95 NA |
220 | void |
221 | libctf_init_debug (void) | |
222 | { | |
223 | static int inited; | |
224 | if (!inited) | |
225 | { | |
226 | _libctf_debug = getenv ("LIBCTF_DEBUG") != NULL; | |
227 | inited = 1; | |
228 | } | |
229 | } | |
230 | ||
231 | void ctf_setdebug (int debug) | |
232 | { | |
233 | /* Ensure that libctf_init_debug() has been called, so that we don't get our | |
234 | debugging-on-or-off smashed by the next call. */ | |
235 | ||
236 | libctf_init_debug(); | |
237 | _libctf_debug = debug; | |
238 | ctf_dprintf ("CTF debugging set to %i\n", debug); | |
239 | } | |
240 | ||
241 | int ctf_getdebug (void) | |
242 | { | |
243 | return _libctf_debug; | |
244 | } | |
245 | ||
246 | _libctf_printflike_ (1, 2) | |
247 | void ctf_dprintf (const char *format, ...) | |
248 | { | |
249 | if (_libctf_debug) | |
250 | { | |
251 | va_list alist; | |
252 | ||
253 | va_start (alist, format); | |
254 | fflush (stdout); | |
255 | (void) fputs ("libctf DEBUG: ", stderr); | |
256 | (void) vfprintf (stderr, format, alist); | |
257 | va_end (alist); | |
258 | } | |
259 | } |