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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 | ||
50500ecf EZ |
29 | #ifndef ENOTSUP |
30 | #define ENOTSUP ENOSYS | |
31 | #endif | |
32 | ||
6c33b742 | 33 | int _libctf_version = CTF_VERSION; /* Library client version. */ |
60da9d95 NA |
34 | int _libctf_debug = 0; /* Debugging messages enabled. */ |
35 | ||
60da9d95 NA |
36 | /* Private, read-only mmap from a file, with fallback to copying. |
37 | ||
38 | No handling of page-offset issues at all: the caller must allow for that. */ | |
39 | ||
40 | _libctf_malloc_ void * | |
41 | ctf_mmap (size_t length, size_t offset, int fd) | |
42 | { | |
43 | void *data; | |
44 | ||
45 | #ifdef HAVE_MMAP | |
46 | data = mmap (NULL, length, PROT_READ, MAP_PRIVATE, fd, offset); | |
47 | if (data == MAP_FAILED) | |
48 | data = NULL; | |
49 | #else | |
50 | if ((data = malloc (length)) != NULL) | |
51 | { | |
52 | if (ctf_pread (fd, data, length, offset) <= 0) | |
53 | { | |
54 | free (data); | |
55 | data = NULL; | |
56 | } | |
57 | } | |
58 | #endif | |
59 | return data; | |
60 | } | |
61 | ||
62 | void | |
63 | ctf_munmap (void *buf, size_t length _libctf_unused_) | |
64 | { | |
65 | #ifdef HAVE_MMAP | |
66 | (void) munmap (buf, length); | |
67 | #else | |
68 | free (buf); | |
69 | #endif | |
70 | } | |
71 | ||
60da9d95 NA |
72 | ssize_t |
73 | ctf_pread (int fd, void *buf, ssize_t count, off_t offset) | |
74 | { | |
75 | ssize_t len; | |
76 | size_t acc = 0; | |
77 | char *data = (char *) buf; | |
78 | ||
79 | #ifdef HAVE_PREAD | |
80 | while (count > 0) | |
81 | { | |
82 | errno = 0; | |
83 | if (((len = pread (fd, data, count, offset)) < 0) && | |
84 | errno != EINTR) | |
85 | return len; | |
86 | if (errno == EINTR) | |
87 | continue; | |
88 | ||
89 | acc += len; | |
90 | if (len == 0) /* EOF. */ | |
91 | return acc; | |
92 | ||
93 | count -= len; | |
94 | offset += len; | |
95 | data += len; | |
96 | } | |
97 | return acc; | |
98 | #else | |
99 | off_t orig_off; | |
100 | ||
101 | if ((orig_off = lseek (fd, 0, SEEK_CUR)) < 0) | |
102 | return -1; | |
103 | if ((lseek (fd, offset, SEEK_SET)) < 0) | |
104 | return -1; | |
105 | ||
106 | while (count > 0) | |
107 | { | |
108 | errno = 0; | |
109 | if (((len = read (fd, data, count)) < 0) && | |
110 | errno != EINTR) | |
111 | return len; | |
112 | if (errno == EINTR) | |
113 | continue; | |
114 | ||
115 | acc += len; | |
116 | if (len == 0) /* EOF. */ | |
117 | break; | |
118 | ||
119 | count -= len; | |
120 | data += len; | |
121 | } | |
122 | if ((lseek (fd, orig_off, SEEK_SET)) < 0) | |
123 | return -1; /* offset is smashed. */ | |
124 | #endif | |
125 | ||
126 | return acc; | |
127 | } | |
128 | ||
129 | const char * | |
130 | ctf_strerror (int err) | |
131 | { | |
132 | return (const char *) (strerror (err)); | |
133 | } | |
134 | ||
6c33b742 NA |
135 | /* Set the CTF library client version to the specified version. If version is |
136 | zero, we just return the default library version number. */ | |
137 | int | |
138 | ctf_version (int version) | |
139 | { | |
140 | if (version < 0) | |
141 | { | |
142 | errno = EINVAL; | |
143 | return -1; | |
144 | } | |
145 | ||
146 | if (version > 0) | |
147 | { | |
148 | /* Dynamic version switching is not presently supported. */ | |
149 | if (version != CTF_VERSION) | |
150 | { | |
151 | errno = ENOTSUP; | |
152 | return -1; | |
153 | } | |
154 | ctf_dprintf ("ctf_version: client using version %d\n", version); | |
155 | _libctf_version = version; | |
156 | } | |
157 | ||
158 | return _libctf_version; | |
159 | } | |
160 | ||
60da9d95 NA |
161 | void |
162 | libctf_init_debug (void) | |
163 | { | |
164 | static int inited; | |
165 | if (!inited) | |
166 | { | |
167 | _libctf_debug = getenv ("LIBCTF_DEBUG") != NULL; | |
168 | inited = 1; | |
169 | } | |
170 | } | |
171 | ||
172 | void ctf_setdebug (int debug) | |
173 | { | |
174 | /* Ensure that libctf_init_debug() has been called, so that we don't get our | |
175 | debugging-on-or-off smashed by the next call. */ | |
176 | ||
177 | libctf_init_debug(); | |
178 | _libctf_debug = debug; | |
179 | ctf_dprintf ("CTF debugging set to %i\n", debug); | |
180 | } | |
181 | ||
182 | int ctf_getdebug (void) | |
183 | { | |
184 | return _libctf_debug; | |
185 | } | |
186 | ||
187 | _libctf_printflike_ (1, 2) | |
188 | void ctf_dprintf (const char *format, ...) | |
189 | { | |
190 | if (_libctf_debug) | |
191 | { | |
192 | va_list alist; | |
193 | ||
194 | va_start (alist, format); | |
195 | fflush (stdout); | |
196 | (void) fputs ("libctf DEBUG: ", stderr); | |
197 | (void) vfprintf (stderr, format, alist); | |
198 | va_end (alist); | |
199 | } | |
200 | } |