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tty_ioctl.4: Rework text on root to discuss just in terms of capabilities 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2013-11-12 16:46:36 +13:00
parent c323f3a1d2
commit cb476d8850
1 changed files with 7 additions and 7 deletions
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14
man4/tty_ioctl.4
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@ -90,9 +90,9 @@ structure of the terminal.
Sets the locking status of the Sets the locking status of the
.I termios .I termios
structure of the terminal. structure of the terminal.
Only root (more precisely: a process with the Only a process with the
.BR CAP_SYS_ADMIN .BR CAP_SYS_ADMIN
capability) can do this. capability can do this.
.SS Get and set window size .SS Get and set window size
Window sizes are kept in the kernel, but not used by the kernel Window sizes are kept in the kernel, but not used by the kernel
(except in the case of virtual consoles, where the kernel will (except in the case of virtual consoles, where the kernel will
@ -223,9 +223,9 @@ to the given terminal.
If that was a pseudoterminal master, send it to the slave. If that was a pseudoterminal master, send it to the slave.
In Linux before version 2.6.10, In Linux before version 2.6.10,
anybody can do this as long as the output was not redirected yet; anybody can do this as long as the output was not redirected yet;
since version 2.6.10, only root (a process with the since version 2.6.10, only a process with the
.BR CAP_SYS_ADMIN .BR CAP_SYS_ADMIN
capability) may do this. capability may do this.
If output was redirected already If output was redirected already
.B EBUSY .B EBUSY
is returned, is returned,
@ -245,9 +245,9 @@ controlling terminal already.
If this terminal is already the controlling terminal If this terminal is already the controlling terminal
of a different session group then the ioctl fails with of a different session group then the ioctl fails with
.BR EPERM , .BR EPERM ,
unless the caller is root (more precisely: has the unless the caller has the
.BR CAP_SYS_ADMIN .BR CAP_SYS_ADMIN
capability) and capability and
.I arg .I arg
equals 1, in which case the terminal is stolen, and all processes that had equals 1, in which case the terminal is stolen, and all processes that had
it as controlling terminal lose it. it as controlling terminal lose it.
@ -292,7 +292,7 @@ No further
operations on the terminal are permitted. operations on the terminal are permitted.
(They will fail with (They will fail with
.BR EBUSY , .BR EBUSY ,
except for root, that is, a process with the except for a process with the
.BR CAP_SYS_ADMIN .BR CAP_SYS_ADMIN
capability.) capability.)
.TP .TP