1 .\" $File: libmagic.man,v 1.23 2011/01/14 21:59:17 rrt Exp $
3 .\" Copyright (c) Christos Zoulas 2003.
4 .\" All Rights Reserved.
6 .\" Redistribution and use in source and binary forms, with or without
7 .\" modification, are permitted provided that the following conditions
9 .\" 1. Redistributions of source code must retain the above copyright
10 .\" notice immediately at the beginning of the file, without modification,
11 .\" this list of conditions, and the following disclaimer.
12 .\" 2. Redistributions in binary form must reproduce the above copyright
13 .\" notice, this list of conditions and the following disclaimer in the
14 .\" documentation and/or other materials provided with the distribution.
16 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 .\" ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 .Nm magic_descriptor ,
41 .Nd Magic number recognition library.
47 .Fn magic_open "int flags"
49 .Fn magic_close "magic_t cookie"
51 .Fn magic_error "magic_t cookie"
53 .Fn magic_errno "magic_t cookie"
55 .Fn magic_descriptor "magic_t cookie, "int fd"
57 .Fn magic_file "magic_t cookie, const char *filename"
59 .Fn magic_buffer "magic_t cookie, const void *buffer, size_t length"
61 .Fn magic_setflags "magic_t cookie, int flags"
63 .Fn magic_check "magic_t cookie, const char *filename"
65 .Fn magic_compile "magic_t cookie, const char *filename"
67 .Fn magic_load "magic_t cookie, const char *filename"
70 operate on the magic database file
73 .Xr magic __FSECTION__ .
77 creates a magic cookie pointer and returns it. It returns NULL if
78 there was an error allocating the magic cookie. The
80 argument specifies how the other magic functions should behave:
81 .Bl -tag -width MAGIC_COMPRESS
85 Print debugging messages to stderr.
87 If the file queried is a symlink, follow it.
89 If the file is compressed, unpack it and look at the contents.
91 If the file is a block or character special device, then open the device
92 and try to look in its contents.
93 .It Dv MAGIC_MIME_TYPE
94 Return a MIME type string, instead of a textual description.
95 .It Dv MAGIC_MIME_ENCODING
96 Return a MIME encoding, instead of a textual description.
98 A shorthand for MAGIC_MIME_TYPE | MAGIC_MIME_ENCODING.
100 Return all matches, not just the first.
102 Check the magic database for consistency and print warnings to stderr.
103 .It Dv MAGIC_PRESERVE_ATIME
104 On systems that support
108 attempt to preserve the access time of files analysed.
110 Don't translate unprintable characters to a \eooo octal representation.
112 Treat operating system errors while trying to open files and follow symlinks
113 as real errors, instead of printing them in the magic buffer.
115 Return the Apple creator and type.
116 .It Dv MAGIC_NO_CHECK_APPTYPE
119 application type (only on EMX).
120 .It Dv MAGIC_NO_CHECK_CDF
121 Don't get extra information on MS Composite Document Files.
122 .It Dv MAGIC_NO_CHECK_COMPRESS
123 Don't look inside compressed files.
124 .It Dv MAGIC_NO_CHECK_ELF
125 Don't print ELF details.
126 .It Dv NO_CHECK_ENCODING
127 Don't check text encodings.
128 .It Dv MAGIC_NO_CHECK_SOFT
129 Don't consult magic files.
130 .It Dv MAGIC_NO_CHECK_TAR
131 Don't examine tar files.
132 .It Dv MAGIC_NO_CHECK_TEXT
133 Don't check for various types of text files.
134 .It Dv MAGIC_NO_CHECK_TOKENS
135 Don't look for known tokens inside ascii files.
141 .Xr magic __FSECTION__
142 database and deallocates any resources used.
146 function returns a textual explanation of the last error, or NULL if there was
151 function returns the last operating system error number
153 that was encountered by a system call.
157 function returns a textual description of the contents of the
159 argument, or NULL if an error occurred.
162 is NULL, then stdin is used.
166 function returns a textual description of the contents of the
168 argument, or NULL if an error occurred.
172 function returns a textual description of the contents of the
182 described above. Note that using both MIME flags together can also
183 return extra information on the charset.
187 function can be used to check the validity of entries in the colon
188 separated database files passed in as
190 or NULL for the default database. It returns 0 on success and -1 on
195 function can be used to compile the the colon
196 separated list of database files passed in as
198 or NULL for the default database. It returns 0 on success and -1 on
199 failure. The compiled files created are named from the
201 of each file argument with
207 function must be used to load the the colon
208 separated list of database files passed in as
210 or NULL for the default database file
211 before any magic queries can performed.
213 The default database file is named by the MAGIC environment variable. If
214 that variable is not set, the default database file name is __MAGIC__.
218 to the database filename as appropriate.
222 returns a magic cookie on success and NULL on failure setting errno to
223 an appropriate value. It will set errno to EINVAL if an unsupported
224 value for flags was given.
230 functions return 0 on success and -1 on failure.
235 functions return a string on success and NULL on failure. The
237 function returns a textual description of the errors of the above
238 functions, or NULL if there was no error.
241 returns -1 on systems that don't support
246 .Dv MAGIC_PRESERVE_ATIME
249 .Bl -tag -width __MAGIC__.mgc -compact
251 The non-compiled default magic database.
253 The compiled default magic database.
256 .Xr file __CSECTION__ ,
257 .Xr magic __FSECTION__
259 Måns Rullgård Initial libmagic implementation,
262 Christos Zoulas API cleanup, error code and allocation handling.