seccomp_user_notif.2: EXAMPLE: ensure path read() by the supervisor is null-terminated

From a conversation with Jann Horn:

    >> We should probably make sure here that the value we read is actually
    >> NUL-terminated?
    >
    > So, I was curious about that point also. But, (why) are we not
    > guaranteed that it will be NUL-terminated?

    Because it's random memory filled by another process, which we don't
    necessarily trust. While seccomp notifiers aren't usable for applying
    *extra* security restrictions, the supervisor will still often be more
    privileged than the supervised process.

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: wfix in example program

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Small wording fix

Change "read(2) will return 0" to "read(2) may return 0".

Quoting Jann Horn:

    Maybe make that "may return 0" instead of "will return 0" -
    reading from /proc/$pid/mem can only return 0 in the
    following cases AFAICS:

    1. task->mm was already gone at open() time
    2. mm->mm_users has dropped to zero (the mm only has lazytlb
       users; page tables and VMAs are being blown away or have
       been blown away)
    3. the syscall was called with length 0

    When a process has gone away, normally mm->mm_users will
    drop to zero, but someone else could theoretically still be
    holding a reference to the mm (e.g. someone else in the
    middle of accessing /proc/$pid/mem).  (Such references
    should normally not be very long-lived though.)

    Additionally, in the unlikely case that the OOM killer just
    chomped through the page tables of the target process, I
    think the read will return -EIO (same error as if the
    address was simply unmapped) if the address is within a
    non-shared mapping. (Maybe that's something procfs could do
    better...)

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Minor wording change + add a FIXME

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: User-space notification can't be used to implement security policy

Add some strongly worded text warning the reader about the correct
uses of seccomp user-space notification.

Reported-by: Jann Horn <jannh@google.com>
Cowritten-by: Christian Brauner <christian@brauner.io>
Cowritten-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Fixes after review comments from Christian Brauner

Reported-by: Christian Brauner <christian@brauner.io>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2, seccomp_user_notif.2: Clarify that there can be only one SECCOMP_FILTER_FLAG_NEW_LISTENER

Reported-by: Christian Brauner <christian@brauner.io>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Note when FD indicates EOF/(E)POLLHUP in (e)poll/select

Verified by experiment.

Reported-by: Christian Brauner <christian.brauner@canonical.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Note when notification FD indicates as writable by select/poll/epoll

Reported-by: Tycho Andersen <tycho@tycho.pizza>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Minor fixes

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Fixes after review comments by Jann Horn

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Add BUGS section describing SECCOMP_IOCTL_NOTIF_RECV bug

Tycho Andersen confirmed that this issue is present.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: srcfix: remove bogus FIXME

Pathname arguments are limited to PATH_MAX bytes.

Reported-by: Tycho Andersen <tycho@tycho.pizza>
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Changes after feed back from Tycho Andersen

Reported-by: Tycho Andersen <tycho@tycho.pizza>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp_user_notif.2: Document the seccomp user-space notification mechanism

The APIs used by this mechanism comprise not only seccomp(2), but
also a number of ioctl(2) operations. And any useful example
demonstrating these APIs is will necessarily be rather long.
Trying to cram all of this into the seccomp(2) page would make
that page unmanageably long. Therefore, let's document this
mechanism in a separate page.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Note that SECCOMP_RET_USER_NOTIF can be overridden

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: wfix: mention term "supervisor" in description of SECCOMP_RET_USER_NOTIF

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: SEE ALSO: add seccomp_user_notif(2)

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Rework SECCOMP_GET_NOTIF_SIZES somewhat

The existing text says the structures (plural!) contain a 'struct
seccomp_data'. But this is only true for the received notification
structure (seccomp_notif). So, reword the sentence to be more
general, noting simply that the structures may evolve over time.

Add some comments to the structure definition.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Add some details for SECCOMP_FILTER_FLAG_NEW_LISTENER

Rework the description a little, and note that the close-on-exec
flag is set for the returned file descriptor.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Minor edits to Tycho's SECCOMP_FILTER_FLAG_NEW_LISTENER patch

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Document SECCOMP_FILTER_FLAG_NEW_LISTENER

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Reorder list of SECCOMP_SET_MODE_FILTER flags alphabetically

(No content changes.)

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Some reworking of Tycho's SECCOMP_RET_USER_NOTIF patch

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Document SECCOMP_RET_USER_NOTIF

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Minor edits to Tycho Andersen's patch

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Document SECCOMP_GET_NOTIF_SIZES

Signed-off-by: Tycho Andersen <tycho@tycho.ws>
CC: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

signal.7: srcfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: SEE ALSO: Add circleq(3)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

CIRCLEQ_ENTRY.3, CIRCLEQ_HEAD.3, CIRCLEQ_INIT.3, CIRCLEQ_INSERT_AFTER.3, CIRCLEQ_INSERT_BEFORE.3, CIRCLEQ_INSERT_HEAD.3, CIRCLEQ_INSERT_TAIL.3, CIRCLEQ_REMOVE.3: Link to the new circleq(3) page instead of queue(3)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3: Add remaining details to complete the page

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3: ffix: Use man markup

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3: Copy and adapt code from queue.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: ffix

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3, queue.3: EXAMPLES: Move circleq example program from queue.3 to circleq.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3, queue.3: DESCRIPTION: Move circleq specific code from queue.3 to circleq.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3, queue.3: SYNOPSIS: Move code from queue.3 to circleq.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3, queue.3: NAME: Move code from queue-3 to circleq.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

circleq.3: New page that will hold the (circleq) content of queue.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: Sort alphabetically

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

slist.3: tfix

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

openat2.2, loop.4: tfix: s/non-zero/nonzero/

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: Sort alphabetically

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3, slist.3, strcmp.3: tfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: SEE ALSO: Add slist(3)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

SLIST_EMPTY.3, SLIST_ENTRY.3, SLIST_FIRST.3, SLIST_FOREACH.3, SLIST_HEAD.3, SLIST_HEAD_INITIALIZER.3, SLIST_INIT.3, SLIST_INSERT_AFTER.3, SLIST_INSERT_HEAD.3, SLIST_NEXT.3, SLIST_REMOVE.3, SLIST_REMOVE_HEAD.3: Link to the new slist(3) page instead of queue(3)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

slist.3: Add details

Add remaining details to complete the page.

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

slist.3: ffix: Use man markup

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

slist.3: Copy and adapt code from queue.3

A few fixes to note:

- Sorted alphabetically some macros
- ffix: remove alignment spaces in example (as in list.3)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3, slist.3: EXAMPLES: Move example program from queue.3 to slist.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3, slist.3: DESCRIPTION: Move slist specific code from queue.3 to slist.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3, slist.3: SYNOPSIS: Move code from queue.3 to list.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3, slist.3: NAME: Move code from queue.3 to slist.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

slist.3: New page that will hold the (slist) contents of queue.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: Minor fix to grammar

Fix a preexisting grammar issue in text taken from queue.3.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: Minor tweak's to Alex's text

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: tfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: SEE ALSO: Add list(3)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

LIST_EMPTY.3, LIST_ENTRY.3, LIST_FIRST.3, LIST_FOREACH.3, LIST_HEAD.3, LIST_HEAD_INITIALIZER.3, LIST_INIT.3, LIST_INSERT_AFTER.3, LIST_INSERT_BEFORE.3, LIST_INSERT_HEAD.3, LIST_NEXT.3, LIST_REMOVE.3: Link to the new list.3 page instead of queue.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: Add details

list.3: NAME: Add description
list.3: DESCRIPTION: Add short description
list.3: SEE ALSO: Add insque(3) and queue(3)
list.3: BUGS: Note LIST_FOREACH() limitations
list.3: RETURN VALUE: Add details about the return value of those macros that "return" a value

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: ffix: Use man markup

list.3: NAME: ffix: Use man markup
list.3: SYNOPSIS: ffix: Use man markup
list.3: DESCRIPTION: ffix: Use man markup
list.3: DESCRIPTION: ffix: Use man markup
list.3: CONFORMING TO: ffix: Use man markup
list.3: EXAMPLES: ffix: Use man markup

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: Copy and adapt code from queue.3

list.3: SYNOPSIS: Copy include from queue.3
list.3: DESCRIPTION: Copy description about naming of macros from queue.3
list.3: DESCRIPTION: Remove unrelated code to adapt to this page
list.3: DESCRIPTION: Remove lines pointing to the EXAMPLES
list.3: CONFORMING TO: Copy from queue.3
list.3: CONFORMING TO: Adapt to this page

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3, queue.3: EXAMPLES: Move example program from queue.3 to list.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3, queue.3: DESCRIPTION: Move list specific code from queue.3 to list.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3, queue.3: SYNOPSIS: Move code from queue.3 to list.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3, queue.3: NAME: Move code from queue.3 to list.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

list.3: New page that will hold the (list) contents of queue.3

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

setns.2: Correct the version for time namespace support

Time namespaces were added in kernel 5.6, but setns() support
for time namespaces was added only starting with kernel 5.8:

    commit 76c12881a38aaa83e1eb4ce2fada36c3a732bad4
    Author: Christian Brauner <christian.brauner@ubuntu.com>
    Date:   Mon Jul 6 17:49:11 2020 +0200

        nsproxy: support CLONE_NEWTIME with setns()

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

namespaces.7: srcfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

namespaces.7: A 'time_for_children' symlink can also pin a namespace

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

clock_t.3: New link to system_data_types(7)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

system_data_types.7: Add 'clock_t'

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

system_data_types.7: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

system_data_types.7: srcfix: add comment noting time_t difference in POSIX.1-2001

Paul Eggert commented on a patch that proposed to note the
POSIX.2001 details:

    No actual POSIXish implementation ever made it a
    real-floating type, though, and that point should be made
    lest some conscientious programmer worry about a nonexistent
    porting issue.

We opted to drop the patch, but in case someone else points out
this POSIX.1-2001 difference in the future, let's leave a comment
in the page source.

Reported-by: Paul Eggert <eggert@cs.ucla.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ld.so.8: Add self to copyright

By now, I'm responsible for quite a lot of the content in
this page.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

mallinfo.3: srcfix: add comments noting errors in glibc info page

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

mallinfo.3: The 'usmblks' is nowadays always 0

Verified from the course code.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

regex.3: Add example program

$ gcc -Wall -Wextra -Werror -pedantic regex.c -o regex
$ ./regex.3
String = "1) John Driverhacker;
2) John Doe;
3) John Foo;
"
Matches:
#0:
offset = 25; length = 7
substring = "John Do"
#1:
offset = 38; length = 8
substring = "John Foo"

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: stailq: Complete example

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

kernel_lockdown.7: Describe LSM activation

Describe the activation of the Kernel Lockdown feature via Kconfig
and the command line.

Cf. Documentation/admin-guide/kernel-parameters.rst.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

kernel_lockdown.7: Add a VERSIONS section

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

kernel_lockdown.7: Various minor edits to bring this page closer to man-pages stype

No content changes...

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

kernel_lockdown.7: New page documenting the Kernel Lockdown feature

Provide a man-page for kernel_lockdown. The content is taken
from a patch for the Fedora 34 man-pages available at

https://kojipkgs.fedoraproject.org//packages/man-pages/5.08/1.fc34/src/man-pages-5.08-1.fc34.src.rpm

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

link.2: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: list: Complete example

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

seccomp.2: Warn reader that SECCOMP_RET_TRACE can be overridden

Highlight to the reader that if another filter returns a
higher-precedence action value, then the ptracer will not
be notified.

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

regex.3: wfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

regex.3: wfix

The wording was incorrect:

It stated that 'eflags' may be the OR of one or two of those two flags,
but then a third flag was documented
(which according to the previous wording could not be used?!).
Moreover, the wording also disallowed using 0 (i.e., no flags at all),
which POSIX specifically allows;
I tested the function with no flags and it worked fine for me,
so I guess it was a problem with the documentation,
and not with the implementation itself.

POSIX ref: https://pubs.opengroup.org/onlinepubs/9699919799/

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

futex.2, quotactl.2: wfix: use "bitwise" rather than "bit-wise"

Most manual pages already use "bitwise".

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: circleq: Complete example

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

resolv.conf.5: Minor edits to Florian Weimer's patch

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

resolv.conf.5: srcfix: rewrap source lines

No content changes

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

resolv.5: Document the trust-ad option

Signed-off-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

strsignal.3: Further addition on version range for sys_siglist

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perror.3: sys_errlist and sys_nerr are no longer exposed by <stdio.h>

The change came with the release of glibc 2.32.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: slist: Complete example

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

queue.3: Replace incomplete example by a complete example

I added the EXAMPLES section.
The examples in this page are incomplete
(you can't copy&paste&compile&run).
I fixed the one about TAILQ first,
and the rest should follow.

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

regex_t.3: New link to system_data_types(7)

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

system_data_types.7: Add 'regex_t'

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>