V3/usr/man/man2/boot.2

Find at most related files.
including files from this version of Unix. 
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NAME		boot -- reboot UNIX
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SYNOPSIS	sys boot	/ boot = 39. not in assembler
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DESCRIPTION	UNIX
will clean up outstanding I\/O, and then execute
the reboot read-only program.
This call is restricted to the super-user.
All users will be logged out.
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SEE ALSO	boot procedures (VII)
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DIAGNOSTICS	the c-bit is set if you are
not the super-user
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BUGS		It
often doesn't work (for unknown reasons).
.br
It depends on switch settings.