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40 .Nd Magic number recognition library.
46 .Fn magic_open "int flags"
48 .Fn magic_close "magic_t cookie"
50 .Fn magic_error "magic_t cookie"
52 .Fn magic_errno "magic_t cookie"
54 .Fn magic_file "magic_t cookie, const char *filename"
56 .Fn magic_buffer "magic_t cookie, const void *buffer, size_t length"
58 .Fn magic_setflags "magic_t cookie, int flags"
60 .Fn magic_check "magic_t cookie, const char *filename"
62 .Fn magic_compile "magic_t cookie, const char *filename"
64 .Fn magic_load "magic_t cookie, const char *filename"
67 operate on the magic database file
70 .Xr magic __FSECTION__ .
74 creates a magic cookie pointer and returns it. It returns NULL if
75 there was an error allocating the magic cookie. The
77 argument specifies how the other magic functions should behave:
78 .Bl -tag -width MAGIC_COMPRESS
82 Print debugging messages to stderr.
84 If the file queried is a symlink, follow it.
86 If the file is compressed, unpack it and look at the contents.
88 If the file is a block or character special device, then open the device
89 and try to look in its contents.
91 Return a mime string, instead of a textual description.
93 Return all matches, not just the first.
95 Check the magic database for consistency and print warnings to stderr.
96 .It Dv MAGIC_PRESERVE_ATIME
97 On systems that support
101 attempt to preserve the access time of files analyzed.
103 Don't translate unprintable characters to a \eooo octal representation.
105 Treat operating system errors while trying to open files and follow symlinks
106 as real errors, instead of printing them in the magic buffer.
112 .Xr magic __FSECTION__
113 database and deallocates any resources used.
117 function returns a textual explanation of the last error, or NULL if there was
122 function returns the last operating system error number (
124 that was encountered by a system call.
128 function returns a textual description of the contents of the
130 argument, or NULL if an error occurred.
133 is NULL, then stdin is used.
137 function returns a textual description of the contents of the
151 function can be used to check the validity of entries in the colon
152 separated database files passed in as
154 or NULL for the default database. It returns 0 on success and -1 on
159 function can be used to compile the the colon
160 separated list of database files passed in as
162 or NULL for the default database. It returns 0 on success and -1 on
163 failure. The compiled files created are named from the
165 of each file argument with ".mgc" appended to it.
169 function must be used to load the the colon
170 separated list of database files passed in as
172 or NULL for the default database file
173 before any magic queries can performed.
175 The default database file is named by the MAGIC environment variable. If
176 that variable is not set, the default database file name is __MAGIC__.
179 adds ".mime" and/or ".mgc" to the database filename as appropriate.
183 returns a magic cookie on success and NULL on failure setting errno to
184 an appropriate value. It will set errno to EINVAL if an unsupported
185 value for flags was given.
191 functions return 0 on success and -1 on failure.
196 functions return a string on success and NULL on failure. The
198 function returns a textual description of the errors of the above
199 functions, or NULL if there was no error.
202 returns -1 on systems that don't support
207 .Dv MAGIC_PRESERVE_ATIME
210 .Bl -tag -width __MAGIC__.mime.mgc -compact
211 .It Pa __MAGIC__.mime
212 The non-compiled default magic mime database.
213 .It Pa __MAGIC__.mime.mgc
214 The compiled default magic mime database.
216 The non-compiled default magic database.
218 The compiled default magic database.
221 .Xr file __CSECTION__ ,
222 .Xr magic __FSECTION__
224 Måns Rullgård Initial libmagic implementation,
226 Christos Zoulas API cleanup, error code and allocation handling.