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e9a910b33c
i currently use the output of sha512sum in several places of xbmk, which is a bit unreliable in case output changes. other cases where i use util outputs in variables are probably reliable, because i'm using mostly posix utilities in those. to mitigate this, i now import suckless sbase, which has a reasonable sha512sum implementation. *every* binary it builds is being placed in build.list, because i'll probably start using more of them. for example, i may start modifying the "date" implementation, adding the GNU-specific options that i need as mentioned on init.sh i'm importing it in util/ because the sha512sum util is needed for verifying project sources, so if sbase itself is a "project source", that means we can into a chicken and egg bootstrapping problem. this is sbase at revision: 055cc1ae1b3a13c3d8f25af0a4a3316590efcd48 Signed-off-by: Leah Rowe <leah@libreboot.org>
36 lines
700 B
Groff
36 lines
700 B
Groff
.Dd October 8, 2015
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.Dt FLOCK 1
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.Os sbase
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.Sh NAME
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.Nm flock
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.Nd tool to manage locks on files
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.Sh SYNOPSIS
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.Nm
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.Op Fl nosux
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.Ar file
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.Ar cmd Op arg ...
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.Sh DESCRIPTION
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.Nm
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is used to manage advisory locks on open files.
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It is commonly used to prevent long running cron jobs from running in
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parallel.
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If
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.Ar file
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does not exist, it will be created.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl n
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Set non-blocking mode on the lock.
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Fail immediately if the lock cannot be acquired.
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.It Fl o
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Close the file descriptor before exec to avoid having the exec'ed
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program holding on to the lock.
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.It Fl s
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Acquire a shared lock.
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.It Fl u
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Release the lock.
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.It Fl x
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Acquire an exclusive lock.
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This is the default.
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.El
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