46 lines
1.2 KiB
Groff
46 lines
1.2 KiB
Groff
.\"
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.TH LOCKDEV 8 "SEPTEMBER 2009" "" ""
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.\"
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.\" Man page written by Jiri Popelka <jpopelka AT redhat DOT com>
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.\"
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.SH NAME
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\fBLockdev\fR is a setgid binary,
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which provides a reliable way to put an exclusive lock
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in /var/lock to devices (e.g. ttyS0) using both FSSTND and SVr4 methods,
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so regular users don't need write access there.
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This task is achieved through calls to the liblockdev(3) API.
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.SH SYNOPSIS
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.B /usr/sbin/lockdev
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.RB [< operation >]
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.RB < device >
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.SH DESCRIPTION
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The \fBlockdev\fR command can perform one of the following operations (calls to liblockdev(3) API):
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\fB-l\fR - lock device with \fBdev_lock()\fR function
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\fB-u\fR - unlock device with \fBdev_unlock()\fR function
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\fBno operation\fR - test lock with \fBdev_testlock()\fR function
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.SH RETURN VALUES
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Value dev_lock dev_unlock dev_testlock
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0 OK OK not locked
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1 locked other locked other locked
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2 EACCES
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3 EROFS
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4 EFAULT
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5 EINVAL
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6 ENAMETOOLONG
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7 ENOENT
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8 ENOTDIR
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9 ENOMEM
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10 ELOOP
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11 EIO
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255 error error error
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.SH SEE ALSO
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.BR lockdev (3).
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