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60da9d95 | 1 | /* Simple subrs. |
b3adc24a | 2 | Copyright (C) 2019-2020 Free Software Foundation, Inc. |
60da9d95 NA |
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 | ||
6c33b742 | 29 | int _libctf_version = CTF_VERSION; /* Library client version. */ |
60da9d95 NA |
30 | int _libctf_debug = 0; /* Debugging messages enabled. */ |
31 | ||
60da9d95 NA |
32 | /* Private, read-only mmap from a file, with fallback to copying. |
33 | ||
34 | No handling of page-offset issues at all: the caller must allow for that. */ | |
35 | ||
36 | _libctf_malloc_ void * | |
37 | ctf_mmap (size_t length, size_t offset, int fd) | |
38 | { | |
39 | void *data; | |
40 | ||
41 | #ifdef HAVE_MMAP | |
42 | data = mmap (NULL, length, PROT_READ, MAP_PRIVATE, fd, offset); | |
43 | if (data == MAP_FAILED) | |
44 | data = NULL; | |
45 | #else | |
46 | if ((data = malloc (length)) != NULL) | |
47 | { | |
48 | if (ctf_pread (fd, data, length, offset) <= 0) | |
49 | { | |
50 | free (data); | |
51 | data = NULL; | |
52 | } | |
53 | } | |
54 | #endif | |
55 | return data; | |
56 | } | |
57 | ||
58 | void | |
59 | ctf_munmap (void *buf, size_t length _libctf_unused_) | |
60 | { | |
61 | #ifdef HAVE_MMAP | |
62 | (void) munmap (buf, length); | |
63 | #else | |
64 | free (buf); | |
65 | #endif | |
66 | } | |
67 | ||
60da9d95 NA |
68 | ssize_t |
69 | ctf_pread (int fd, void *buf, ssize_t count, off_t offset) | |
70 | { | |
71 | ssize_t len; | |
72 | size_t acc = 0; | |
73 | char *data = (char *) buf; | |
74 | ||
75 | #ifdef HAVE_PREAD | |
76 | while (count > 0) | |
77 | { | |
78 | errno = 0; | |
79 | if (((len = pread (fd, data, count, offset)) < 0) && | |
80 | errno != EINTR) | |
81 | return len; | |
82 | if (errno == EINTR) | |
83 | continue; | |
84 | ||
85 | acc += len; | |
86 | if (len == 0) /* EOF. */ | |
87 | return acc; | |
88 | ||
89 | count -= len; | |
90 | offset += len; | |
91 | data += len; | |
92 | } | |
93 | return acc; | |
94 | #else | |
95 | off_t orig_off; | |
96 | ||
97 | if ((orig_off = lseek (fd, 0, SEEK_CUR)) < 0) | |
98 | return -1; | |
99 | if ((lseek (fd, offset, SEEK_SET)) < 0) | |
100 | return -1; | |
101 | ||
102 | while (count > 0) | |
103 | { | |
104 | errno = 0; | |
105 | if (((len = read (fd, data, count)) < 0) && | |
106 | errno != EINTR) | |
107 | return len; | |
108 | if (errno == EINTR) | |
109 | continue; | |
110 | ||
111 | acc += len; | |
112 | if (len == 0) /* EOF. */ | |
113 | break; | |
114 | ||
115 | count -= len; | |
116 | data += len; | |
117 | } | |
118 | if ((lseek (fd, orig_off, SEEK_SET)) < 0) | |
119 | return -1; /* offset is smashed. */ | |
120 | #endif | |
121 | ||
122 | return acc; | |
123 | } | |
124 | ||
125 | const char * | |
126 | ctf_strerror (int err) | |
127 | { | |
128 | return (const char *) (strerror (err)); | |
129 | } | |
130 | ||
6c33b742 NA |
131 | /* Set the CTF library client version to the specified version. If version is |
132 | zero, we just return the default library version number. */ | |
133 | int | |
134 | ctf_version (int version) | |
135 | { | |
136 | if (version < 0) | |
137 | { | |
138 | errno = EINVAL; | |
139 | return -1; | |
140 | } | |
141 | ||
142 | if (version > 0) | |
143 | { | |
144 | /* Dynamic version switching is not presently supported. */ | |
145 | if (version != CTF_VERSION) | |
146 | { | |
147 | errno = ENOTSUP; | |
148 | return -1; | |
149 | } | |
150 | ctf_dprintf ("ctf_version: client using version %d\n", version); | |
151 | _libctf_version = version; | |
152 | } | |
153 | ||
154 | return _libctf_version; | |
155 | } | |
156 | ||
60da9d95 NA |
157 | void |
158 | libctf_init_debug (void) | |
159 | { | |
160 | static int inited; | |
161 | if (!inited) | |
162 | { | |
163 | _libctf_debug = getenv ("LIBCTF_DEBUG") != NULL; | |
164 | inited = 1; | |
165 | } | |
166 | } | |
167 | ||
168 | void ctf_setdebug (int debug) | |
169 | { | |
170 | /* Ensure that libctf_init_debug() has been called, so that we don't get our | |
171 | debugging-on-or-off smashed by the next call. */ | |
172 | ||
173 | libctf_init_debug(); | |
174 | _libctf_debug = debug; | |
175 | ctf_dprintf ("CTF debugging set to %i\n", debug); | |
176 | } | |
177 | ||
178 | int ctf_getdebug (void) | |
179 | { | |
180 | return _libctf_debug; | |
181 | } | |
182 | ||
183 | _libctf_printflike_ (1, 2) | |
184 | void ctf_dprintf (const char *format, ...) | |
185 | { | |
186 | if (_libctf_debug) | |
187 | { | |
188 | va_list alist; | |
189 | ||
190 | va_start (alist, format); | |
191 | fflush (stdout); | |
192 | (void) fputs ("libctf DEBUG: ", stderr); | |
193 | (void) vfprintf (stderr, format, alist); | |
194 | va_end (alist); | |
195 | } | |
196 | } |