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tty_ioctl.4: Explain capability requirements for various ioctls 

For TIOCSLCKTRMIOS, TIOCSCTTY, TIOCEXCL, explain the exact
capability that is required (the text formerly just said "root"
in each case).

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-10-16 17:27:10 +02:00
parent 4961e71d7f
commit c0b7505909
1 changed files with 9 additions and 3 deletions
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12
man4/tty_ioctl.4
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@ -85,7 +85,9 @@ structure of the terminal.
Sets the locking status of the
.I termios
structure of the terminal.
Only root can do this.
Only root (more precisely: a process with the
.BR CAP_SYS_ADMIN
capability) can do this.
.SS "Get and Set Window Size"
Window sizes are kept in the kernel, but not used by the kernel
(except in the case of virtual consoles, where the kernel will
@ -233,7 +235,9 @@ controlling tty already.
If this tty is already the controlling tty
of a different session group then the ioctl fails with
.BR EPERM ,
unless the caller is root and
unless the caller is root (more precisely: has the
.BR CAP_SYS_ADMIN
capability) and
.I arg
equals 1, in which case the tty is stolen, and all processes that had
it as controlling tty lose it.
@ -277,7 +281,9 @@ No further
operations on the terminal are permitted.
(They will fail with
.BR EBUSY ,
except for root.)
except for root, that is, a process with the
.BR CAP_SYS_ADMIN
capability.)
.TP
.B "TIOCNXCL void"
Disable exclusive mode.