include/pidfd-utils: remove hardcoded syscall fallback

[thirdparty/util-linux.git] / misc-utils / mcookie.1

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-.\" mcookie.1 --
-.\" Public Domain 1995 Rickard E. Faith (faith@cs.unc.edu)
-.TH MCOOKIE 1 "December 2014" "util-linux" "User Commands"
-.SH NAME
-mcookie \- generate magic cookies for xauth
-.SH SYNOPSIS
-.B mcookie
-[options]
-.SH DESCRIPTION
-.B mcookie
-generates a 128-bit random hexadecimal number for use with the X authority
-system.  Typical usage:
-.sp
-.RS
-.B xauth add :0 . `mcookie`
-.RE
-.PP
-The "random" number generated is actually the MD5 message
-digest of random information coming from one of the sources
-.IR /dev/urandom ,
-.IR /dev/random ,
-or the
-.IR "libc pseudo-random functions" ,
-in this preference order.
-.SH OPTIONS
-.TP
-.BR \-f , " \-\-file " \fIfile
-Use this \fIfile\fR as an additional source of randomness.
-When \fIfile\fR is '-', characters are read from standard input.
-.TP
-.BR \-m , " \-\-max\-size " \fInumber
-Read from \fIfile\fR only this \fInumber\fR of bytes.
-This option is meant to be used when reading additional
-randomness from a file or device.
-.IP
-The
-.I number
-argument may be followed by the multiplicative suffixes KiB=1024,
-MiB=1024*1024, and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is
-optional, e.g., "K" has the same meaning as "KiB") or the suffixes
-KB=1000, MB=1000*1000, and so on for GB, TB, PB, EB, ZB and YB.
-.TP
-.BR \-v , " \-\-verbose"
-Inform where randomness originated, with amount of entropy read from each
-source.
-.TP
-.BR \-V , " \-\-version"
-Display version information and exit.
-.TP
-.BR \-h , " \-\-help"
-Display help text and exit.
-.SH BUGS
-It is assumed that none of the randomness sources will block.
-.SH FILES
-.I /dev/urandom
-.br
-.I /dev/random
-.SH "SEE ALSO"
-.BR md5sum (1),
-.BR X (1),
-.BR xauth (1),
-.BR rand (3)
-.SH AVAILABILITY
-The mcookie command is part of the util-linux package and is available from
-.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
-Linux Kernel Archive
-.UE .