mirror of https://github.com/mkerrisk/man-pages
clone.2: Introduce "flags mask" as a generic term for clone()/clone3()
Use "flags mask" as a generic term to refer to the clone() 'flags' argument and the clone3() 'cl_args.flags' field. Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk
parent
5261b0fe75
commit
16853a31ee
123
man2/clone.2
123
man2/clone.2
|
|
@ -278,7 +278,7 @@ options when waiting for the child with
|
|||
If no signal (i.e., zero) is specified, then the parent process is not signaled
|
||||
when the child terminates.
|
||||
.\"
|
||||
.SS The flags bit mask
|
||||
.SS The flags mask
|
||||
.PP
|
||||
Both
|
||||
.BR clone ()
|
||||
|
|
@ -295,7 +295,14 @@ or the
|
|||
.I cl_args.flags
|
||||
field passed to
|
||||
.BR clone3 ()\(emis
|
||||
specified as a bitwise-OR of zero or more of the constants listed below.
|
||||
referred to as the
|
||||
.I flags
|
||||
mask in the remainder of this page.
|
||||
.PP
|
||||
The
|
||||
.I flags
|
||||
mask is specified as a bitwise-OR of zero or more of
|
||||
the constants listed below.
|
||||
Except as noted below, these flags are available
|
||||
(and have the same effect) in both
|
||||
.BR clone ()
|
||||
|
|
@ -695,8 +702,9 @@ of not much use.
|
|||
From Linux 2.3.21 onward, this flag could be
|
||||
specified only by the system boot process (PID 0).
|
||||
The flag disappeared completely from the kernel sources in Linux 2.5.16.
|
||||
Since then, the kernel silently ignores this bit if it is specified in
|
||||
.IR flags .
|
||||
Since then, the kernel silently ignores this bit if it is specified in the
|
||||
.IR flags
|
||||
mask.
|
||||
.TP
|
||||
.BR CLONE_PIDFD " (since Linux 5.2)"
|
||||
.\" commit b3e5838252665ee4cfa76b82bdf1198dca81e5be
|
||||
|
|
@ -797,8 +805,9 @@ process.
|
|||
.IP
|
||||
Since Linux 2.6.0,
|
||||
.\" Precisely: Linux 2.6.0-test6
|
||||
the
|
||||
.I flags
|
||||
must also include
|
||||
mask must also include
|
||||
.B CLONE_VM
|
||||
if
|
||||
.B CLONE_SIGHAND
|
||||
|
|
@ -913,9 +922,9 @@ then any thread in the group can
|
|||
.BR wait (2)
|
||||
for that child.
|
||||
.IP
|
||||
Since Linux 2.5.35,
|
||||
Since Linux 2.5.35, the
|
||||
.I flags
|
||||
must also include
|
||||
mask must also include
|
||||
.B CLONE_SIGHAND
|
||||
if
|
||||
.B CLONE_THREAD
|
||||
|
|
@ -1200,7 +1209,9 @@ Too many processes are already running; see
|
|||
.TP
|
||||
.B EINVAL
|
||||
.B CLONE_SIGHAND
|
||||
was specified, but
|
||||
was specified in the
|
||||
.I flags
|
||||
mask, but
|
||||
.B CLONE_VM
|
||||
was not.
|
||||
(Since Linux 2.6.0.)
|
||||
|
|
@ -1208,7 +1219,9 @@ was not.
|
|||
.TP
|
||||
.B EINVAL
|
||||
.B CLONE_THREAD
|
||||
was specified, but
|
||||
was specified in the
|
||||
.I flags
|
||||
mask, but
|
||||
.B CLONE_SIGHAND
|
||||
was not.
|
||||
(Since Linux 2.5.35.)
|
||||
|
|
@ -1223,7 +1236,9 @@ was not.
|
|||
.TP
|
||||
.B EINVAL
|
||||
.B CLONE_THREAD
|
||||
was specified, but the current process previously called
|
||||
was specified in the
|
||||
.I flags
|
||||
mask, but the current process previously called
|
||||
.BR unshare (2)
|
||||
with the
|
||||
.B CLONE_NEWPID
|
||||
|
|
@ -1237,24 +1252,27 @@ Both
|
|||
.B CLONE_FS
|
||||
and
|
||||
.B CLONE_NEWNS
|
||||
were specified in
|
||||
.IR flags .
|
||||
were specified in the
|
||||
.IR flags
|
||||
mask.
|
||||
.TP
|
||||
.BR EINVAL " (since Linux 3.9)"
|
||||
Both
|
||||
.B CLONE_NEWUSER
|
||||
and
|
||||
.B CLONE_FS
|
||||
were specified in
|
||||
.IR flags .
|
||||
were specified in the
|
||||
.IR flags
|
||||
mask.
|
||||
.TP
|
||||
.B EINVAL
|
||||
Both
|
||||
.B CLONE_NEWIPC
|
||||
and
|
||||
.B CLONE_SYSVSEM
|
||||
were specified in
|
||||
.IR flags .
|
||||
were specified in the
|
||||
.IR flags
|
||||
mask.
|
||||
.TP
|
||||
.B EINVAL
|
||||
One (or both) of
|
||||
|
|
@ -1265,8 +1283,9 @@ and one (or both) of
|
|||
.BR CLONE_THREAD
|
||||
or
|
||||
.BR CLONE_PARENT
|
||||
were specified in
|
||||
.IR flags .
|
||||
were specified in the
|
||||
.IR flags
|
||||
mask.
|
||||
.TP
|
||||
.B EINVAL
|
||||
Returned by the glibc
|
||||
|
|
@ -1279,8 +1298,9 @@ is specified as NULL.
|
|||
.TP
|
||||
.B EINVAL
|
||||
.BR CLONE_NEWIPC
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
but the kernel was not configured with the
|
||||
.B CONFIG_SYSVIPC
|
||||
and
|
||||
|
|
@ -1289,32 +1309,36 @@ options.
|
|||
.TP
|
||||
.B EINVAL
|
||||
.BR CLONE_NEWNET
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
but the kernel was not configured with the
|
||||
.B CONFIG_NET_NS
|
||||
option.
|
||||
.TP
|
||||
.B EINVAL
|
||||
.BR CLONE_NEWPID
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
but the kernel was not configured with the
|
||||
.B CONFIG_PID_NS
|
||||
option.
|
||||
.TP
|
||||
.B EINVAL
|
||||
.BR CLONE_NEWUSER
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
but the kernel was not configured with the
|
||||
.B CONFIG_USER_NS
|
||||
option.
|
||||
.TP
|
||||
.B EINVAL
|
||||
.BR CLONE_NEWUTS
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
but the kernel was not configured with the
|
||||
.B CONFIG_UTS_NS
|
||||
option.
|
||||
|
|
@ -1329,17 +1353,26 @@ must be a multiple of 16.
|
|||
.B EINVAL
|
||||
.B CLONE_PIDFD
|
||||
was specified together with
|
||||
.B CLONE_DETACHED.
|
||||
.B CLONE_DETACHED
|
||||
in the
|
||||
.I flags
|
||||
mask.
|
||||
.TP
|
||||
.B EINVAL
|
||||
.B CLONE_PIDFD
|
||||
was specified together with
|
||||
.B CLONE_THREAD.
|
||||
.B CLONE_THREAD
|
||||
in the
|
||||
.I flags
|
||||
mask.
|
||||
.TP
|
||||
.BR "EINVAL " "(" clone "() only)"
|
||||
.B CLONE_PIDFD
|
||||
was specified together with
|
||||
.B CLONE_PARENT_SETTID.
|
||||
.B CLONE_PARENT_SETTID
|
||||
in the
|
||||
.I flags
|
||||
mask.
|
||||
.TP
|
||||
.B ENOMEM
|
||||
Cannot allocate sufficient memory to allocate a task structure for the
|
||||
|
|
@ -1349,16 +1382,18 @@ copied.
|
|||
.BR ENOSPC " (since Linux 3.7)"
|
||||
.\" commit f2302505775fd13ba93f034206f1e2a587017929
|
||||
.B CLONE_NEWPID
|
||||
was specified in flags,
|
||||
was specified in the
|
||||
.I flags
|
||||
mask,
|
||||
but the limit on the nesting depth of PID namespaces
|
||||
would have been exceeded; see
|
||||
.BR pid_namespaces (7).
|
||||
.TP
|
||||
.BR ENOSPC " (since Linux 4.9; beforehand " EUSERS )
|
||||
.B CLONE_NEWUSER
|
||||
was specified in
|
||||
.IR flags ,
|
||||
and the call would cause the limit on the number of
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask, and the call would cause the limit on the number of
|
||||
nested user namespaces to be exceeded.
|
||||
See
|
||||
.BR user_namespaces (7).
|
||||
|
|
@ -1367,9 +1402,9 @@ From Linux 3.11 to Linux 4.8, the error diagnosed in this case was
|
|||
.BR EUSERS .
|
||||
.TP
|
||||
.BR ENOSPC " (since Linux 4.9)"
|
||||
One of the values in
|
||||
One of the values in the
|
||||
.I flags
|
||||
specified the creation of a new user namespace,
|
||||
mask specified the creation of a new user namespace,
|
||||
but doing so would have caused the limit defined by the corresponding file in
|
||||
.IR /proc/sys/user
|
||||
to be exceeded.
|
||||
|
|
@ -1393,8 +1428,9 @@ was specified by a process other than process 0.
|
|||
.TP
|
||||
.B EPERM
|
||||
.BR CLONE_NEWUSER
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
but either the effective user ID or the effective group ID of the caller
|
||||
does not have a mapping in the parent namespace (see
|
||||
.BR user_namespaces (7)).
|
||||
|
|
@ -1402,9 +1438,9 @@ does not have a mapping in the parent namespace (see
|
|||
.BR EPERM " (since Linux 3.9)"
|
||||
.\" commit 3151527ee007b73a0ebd296010f1c0454a919c7d
|
||||
.B CLONE_NEWUSER
|
||||
was specified in
|
||||
was specified in the
|
||||
.I flags
|
||||
and the caller is in a chroot environment
|
||||
mask and the caller is in a chroot environment
|
||||
.\" FIXME What is the rationale for this restriction?
|
||||
(i.e., the caller's root directory does not match the root directory
|
||||
of the mount namespace in which it resides).
|
||||
|
|
@ -1416,8 +1452,9 @@ System call was interrupted by a signal and will be restarted.
|
|||
.TP
|
||||
.BR EUSERS " (Linux 3.11 to Linux 4.8)"
|
||||
.B CLONE_NEWUSER
|
||||
was specified in
|
||||
.IR flags ,
|
||||
was specified in the
|
||||
.IR flags
|
||||
mask,
|
||||
and the limit on the number of nested user namespaces would be exceeded.
|
||||
See the discussion of the
|
||||
.BR ENOSPC
|
||||
|
|
|
|||
Loading…
Reference in New Issue