LIBMAGIC - Online Linux Manual Page

Section : 3
Updated : November 24, 2009

NAME

magic_open

magic_close

magic_error

magic_file

magic_buffer

magic_setflags

magic_check

magic_compile

magic_load

— Magic number recognition library.

LIBRARY

Magic Number Recognition Library (libmagic ,

-lmagic

)

SYNOPSIS

#include <magic.h>

magic_t

magic_open

(

int

flags

);

void

magic_close

(

magic_t

);

const char *

magic_error

(

magic_t

);

int

magic_errno

(

magic_t

);

const char *

magic_file

(

magic_t

cookie,

const

char

*filename

);

const char *

magic_buffer

(

magic_t

cookie,

const

void

*buffer,

size_t

length

);

int

magic_setflags

(

magic_t

cookie,

int

flags

);

int

magic_check

(

magic_t

cookie,

const

char

*filename

);

int

magic_compile

(

magic_t

cookie,

const

char

*filename

);

int

magic_load

(

magic_t

cookie,

const

char

*filename

);

DESCRIPTION

These functions operate on the magic database file which is described in magic(5).

The function

magic_open

(

) creates a magic cookie pointer and returns it. It returns NULL if there was an error allocating the magic cookie. The flags argument specifies how the other magic functions should behave:

Dv MAGIC_NONE No special handling.

Dv MAGIC_DEBUG Print debugging messages to stderr.

Dv MAGIC_SYMLINK If the file queried is a symlink, follow it.

Dv MAGIC_COMPRESS If the file is compressed, unpack it and look at the contents.

Dv MAGIC_DEVICES If the file is a block or character special device, then open the device and try to look in its contents.

Dv MAGIC_MIME_TYPE Return a MIME type string, instead of a textual description.

Dv MAGIC_MIME_ENCODING Return a MIME encoding, instead of a textual description.

Dv MAGIC_CONTINUE Return all matches, not just the first.

Dv MAGIC_CHECK Check the magic database for consistency and print warnings to stderr.

Dv MAGIC_PRESERVE_ATIME On systems that support utime(2) or utimes(2), attempt to preserve the access time of files analyzed.

Dv MAGIC_RAW Don't translate unprintable characters to a \ooo octal representation.

Dv MAGIC_ERROR Treat operating system errors while trying to open files and follow symlinks as real errors, instead of printing them in the magic buffer.

Dv MAGIC_NO_CHECK_APPTYPE Check for

EMX

application type (only on EMX).

Dv MAGIC_NO_CHECK_ASCII Check for various types of ascii files.

Dv MAGIC_NO_CHECK_COMPRESS Don't look for, or inside compressed files.

Dv MAGIC_NO_CHECK_ELF Don't print elf details.

Dv MAGIC_NO_CHECK_FORTRAN Don't look for fortran sequences inside ascii files.

Dv MAGIC_NO_CHECK_SOFT Don't consult magic files.

Dv MAGIC_NO_CHECK_TAR Don't examine tar files.

Dv MAGIC_NO_CHECK_TOKENS Don't look for known tokens inside ascii files.

Dv MAGIC_NO_CHECK_TROFF Don't look for troff sequences inside ascii files.

The

magic_close

(

) function closes the magic(5) database and deallocates any resources used.

The

magic_error

(

) function returns a textual explanation of the last error, or NULL if there was no error.

The

magic_errno

(

) function returns the last operating system error number (errno 2) that was encountered by a system call.

The

magic_file

(

) function returns a textual description of the contents of the filename argument, or NULL if an error occurred. If the filename is NULL, then stdin is used.

The

magic_buffer

(

) function returns a textual description of the contents of the buffer argument with length bytes size.

The

magic_setflags

(

) function sets the flags described above. Note that using both MIME flags together can also return extra information on the charset.

The

magic_check

(

) function can be used to check the validity of entries in the colon separated database files passed in as filename, or NULL for the default database. It returns 0 on success and -1 on failure.

The

magic_compile

(

) function can be used to compile the the colon separated list of database files passed in as filename, or NULL for the default database. It returns 0 on success and -1 on failure. The compiled files created are named from the basename(1) of each file argument with ‟.mgc” appended to it.

The

magic_load

(

) function must be used to load the the colon separated list of database files passed in as filename, or NULL for the default database file before any magic queries can performed.

The default database file is named by the MAGIC environment variable. If that variable is not set, the default database file name is /usr/share/misc/magic.

magic_load

(

) adds ‟.mgc” to the database filename as appropriate.

RETURN VALUES

The function

magic_open

(

) returns a magic cookie on success and NULL on failure setting errno to an appropriate value. It will set errno to EINVAL if an unsupported value for flags was given. The

magic_load

(

magic_compile

(

), and

magic_check

(

) functions return 0 on success and -1 on failure. The

magic_file

(

), and

magic_buffer

(

) functions return a string on success and NULL on failure. The

magic_error

(

) function returns a textual description of the errors of the above functions, or NULL if there was no error. Finally,

magic_setflags

(

) returns -1 on systems that don't support utime(2), or utimes(2) when

MAGIC_PRESERVE_ATIME

is set.

FILES

/usr/share/misc/magic

The non-compiled default magic database.

/usr/share/misc/magic.mgc

The compiled default magic database.

SEE ALSO

file(1), magic(5)

AUTHORS

Måns Rullgård Initial libmagic implementation, and configuration. Christos Zoulas API cleanup, error code and allocation handling.

Johanes Gumabo

Data Size : 19,626 byte

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ERROR :

Need New Coding

(mdoc_err|80|libmagic.3|80|Dv|.It Dv MAGIC_NONE ) (mdoc_err|80|libmagic.3|82|Dv|.It Dv MAGIC_DEBUG ) (mdoc_err|80|libmagic.3|84|Dv|.It Dv MAGIC_SYMLINK ) (mdoc_err|80|libmagic.3|86|Dv|.It Dv MAGIC_COMPRESS ) (mdoc_err|80|libmagic.3|88|Dv|.It Dv MAGIC_DEVICES ) (mdoc_err|80|libmagic.3|91|Dv|.It Dv MAGIC_MIME_TYPE ) (mdoc_err|80|libmagic.3|93|Dv|.It Dv MAGIC_MIME_ENCODING ) (mdoc_err|80|libmagic.3|95|Dv|.It Dv MAGIC_CONTINUE ) (mdoc_err|80|libmagic.3|97|Dv|.It Dv MAGIC_CHECK ) (mdoc_err|80|libmagic.3|99|Dv|.It Dv MAGIC_PRESERVE_ATIME ) (mdoc_err|80|libmagic.3|105|Dv|.It Dv MAGIC_RAW ) (mdoc_err|80|libmagic.3|107|Dv|.It Dv MAGIC_ERROR ) (mdoc_err|80|libmagic.3|110|Dv|.It Dv MAGIC_NO_CHECK_APPTYPE ) (mdoc_err|80|libmagic.3|114|Dv|.It Dv MAGIC_NO_CHECK_ASCII ) (mdoc_err|80|libmagic.3|116|Dv|.It Dv MAGIC_NO_CHECK_COMPRESS ) (mdoc_err|80|libmagic.3|118|Dv|.It Dv MAGIC_NO_CHECK_ELF ) (mdoc_err|80|libmagic.3|120|Dv|.It Dv MAGIC_NO_CHECK_FORTRAN ) (mdoc_err|80|libmagic.3|122|Dv|.It Dv MAGIC_NO_CHECK_SOFT ) (mdoc_err|80|libmagic.3|124|Dv|.It Dv MAGIC_NO_CHECK_TAR ) (mdoc_err|80|libmagic.3|126|Dv|.It Dv MAGIC_NO_CHECK_TOKENS ) (mdoc_err|80|libmagic.3|128|Dv|.It Dv MAGIC_NO_CHECK_TROFF )