gh-106948: Docs: Disable links for C standard library functions, OS utility functions and system calls (#107062)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

11 files changed, 57 insertions, 40 deletions

diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst
index 3d4ceb3..4d81b27 100644
--- a/Doc/c-api/exceptions.rst
+++ b/Doc/c-api/exceptions.rst
@@ -163,7 +163,7 @@ For convenience, some of these functions will always return a
    This is a convenience function to raise an exception when a C library function
    has returned an error and set the C variable :c:data:`errno`.  It constructs a
    tuple object whose first item is the integer :c:data:`errno` value and whose
-   second item is the corresponding error message (gotten from :c:func:`strerror`),
+   second item is the corresponding error message (gotten from :c:func:`!strerror`),
    and then calls ``PyErr_SetObject(type, object)``.  On Unix, when the
    :c:data:`errno` value is :c:macro:`EINTR`, indicating an interrupted system call,
    this calls :c:func:`PyErr_CheckSignals`, and if that set the error indicator,
diff --git a/Doc/c-api/sys.rst b/Doc/c-api/sys.rst
index 433d69e..6a71712 100644
--- a/Doc/c-api/sys.rst
+++ b/Doc/c-api/sys.rst
@@ -106,7 +106,7 @@ Operating System Utilities
 .. c:function:: PyOS_sighandler_t PyOS_getsig(int i)
 
    Return the current signal handler for signal *i*.  This is a thin wrapper around
-   either :c:func:`sigaction` or :c:func:`signal`.  Do not call those functions
+   either :c:func:`!sigaction` or :c:func:`!signal`.  Do not call those functions
    directly! :c:type:`PyOS_sighandler_t` is a typedef alias for :c:expr:`void
    (\*)(int)`.
 
@@ -114,7 +114,7 @@ Operating System Utilities
 .. c:function:: PyOS_sighandler_t PyOS_setsig(int i, PyOS_sighandler_t h)
 
    Set the signal handler for signal *i* to be *h*; return the old signal handler.
-   This is a thin wrapper around either :c:func:`sigaction` or :c:func:`signal`.  Do
+   This is a thin wrapper around either :c:func:`!sigaction` or :c:func:`!signal`.  Do
    not call those functions directly!  :c:type:`PyOS_sighandler_t` is a typedef
    alias for :c:expr:`void (\*)(int)`.
 
diff --git a/Doc/conf.py b/Doc/conf.py
index bd01850..453f4fc 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -77,6 +77,24 @@ if venvdir is not None:
     exclude_patterns.append(venvdir + '/*')
 
 nitpick_ignore = [
+    # Standard C functions
+    ('c:func', 'calloc'),
+    ('c:func', 'dlopen'),
+    ('c:func', 'exec'),
+    ('c:func', 'fcntl'),
+    ('c:func', 'fork'),
+    ('c:func', 'free'),
+    ('c:func', 'gmtime'),
+    ('c:func', 'localtime'),
+    ('c:func', 'main'),
+    ('c:func', 'malloc'),
+    ('c:func', 'printf'),
+    ('c:func', 'realloc'),
+    ('c:func', 'snprintf'),
+    ('c:func', 'sprintf'),
+    ('c:func', 'stat'),
+    ('c:func', 'system'),
+    ('c:func', 'vsnprintf'),
     # Standard C types
     ('c:type', 'FILE'),
     ('c:type', '__int'),
diff --git a/Doc/howto/instrumentation.rst b/Doc/howto/instrumentation.rst
index 4ce15c6..875f846 100644
--- a/Doc/howto/instrumentation.rst
+++ b/Doc/howto/instrumentation.rst
@@ -292,11 +292,11 @@ Available static markers
 
 .. object:: function__return(str filename, str funcname, int lineno)
 
-   This marker is the converse of :c:func:`function__entry`, and indicates that
+   This marker is the converse of :c:func:`!function__entry`, and indicates that
    execution of a Python function has ended (either via ``return``, or via an
    exception).  It is only triggered for pure-Python (bytecode) functions.
 
-   The arguments are the same as for :c:func:`function__entry`
+   The arguments are the same as for :c:func:`!function__entry`
 
 .. object:: line(str filename, str funcname, int lineno)
 
@@ -304,7 +304,7 @@ Available static markers
    the equivalent of line-by-line tracing with a Python profiler.  It is
    not triggered within C functions.
 
-   The arguments are the same as for :c:func:`function__entry`.
+   The arguments are the same as for :c:func:`!function__entry`.
 
 .. object:: gc__start(int generation)
 
diff --git a/Doc/library/mailbox.rst b/Doc/library/mailbox.rst
index 56908de..91df07d 100644
--- a/Doc/library/mailbox.rst
+++ b/Doc/library/mailbox.rst
@@ -477,7 +477,7 @@ Supported mailbox formats are Maildir, mbox, MH, Babyl, and MMDF.
                unlock()
 
       Three locking mechanisms are used---dot locking and, if available, the
-      :c:func:`flock` and :c:func:`lockf` system calls.
+      :c:func:`!flock` and :c:func:`!lockf` system calls.
 
 
 .. seealso::
@@ -588,7 +588,7 @@ Supported mailbox formats are Maildir, mbox, MH, Babyl, and MMDF.
                unlock()
 
       Three locking mechanisms are used---dot locking and, if available, the
-      :c:func:`flock` and :c:func:`lockf` system calls. For MH mailboxes, locking
+      :c:func:`!flock` and :c:func:`!lockf` system calls. For MH mailboxes, locking
       the mailbox means locking the :file:`.mh_sequences` file and, only for the
       duration of any operations that affect them, locking individual message
       files.
@@ -686,7 +686,7 @@ Supported mailbox formats are Maildir, mbox, MH, Babyl, and MMDF.
                unlock()
 
       Three locking mechanisms are used---dot locking and, if available, the
-      :c:func:`flock` and :c:func:`lockf` system calls.
+      :c:func:`!flock` and :c:func:`!lockf` system calls.
 
 
 .. seealso::
@@ -737,7 +737,7 @@ Supported mailbox formats are Maildir, mbox, MH, Babyl, and MMDF.
                unlock()
 
       Three locking mechanisms are used---dot locking and, if available, the
-      :c:func:`flock` and :c:func:`lockf` system calls.
+      :c:func:`!flock` and :c:func:`!lockf` system calls.
 
 
 .. seealso::
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 5740591..bbf227a 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -714,14 +714,14 @@ process and user.
 
 .. function:: getsid(pid, /)
 
-   Call the system call :c:func:`getsid`.  See the Unix manual for the semantics.
+   Call the system call :c:func:`!getsid`.  See the Unix manual for the semantics.
 
    .. availability:: Unix, not Emscripten, not WASI.
 
 
 .. function:: setsid()
 
-   Call the system call :c:func:`setsid`.  See the Unix manual for the semantics.
+   Call the system call :c:func:`!setsid`.  See the Unix manual for the semantics.
 
    .. availability:: Unix, not Emscripten, not WASI.
 
@@ -739,7 +739,7 @@ process and user.
 .. function:: strerror(code, /)
 
    Return the error message corresponding to the error code in *code*.
-   On platforms where :c:func:`strerror` returns ``NULL`` when given an unknown
+   On platforms where :c:func:`!strerror` returns ``NULL`` when given an unknown
    error number, :exc:`ValueError` is raised.
 
 
diff --git a/Doc/library/select.rst b/Doc/library/select.rst
index b0891b0..c2941e6 100644
--- a/Doc/library/select.rst
+++ b/Doc/library/select.rst
@@ -6,10 +6,10 @@
 
 --------------
 
-This module provides access to the :c:func:`select` and :c:func:`poll` functions
-available in most operating systems, :c:func:`devpoll` available on
-Solaris and derivatives, :c:func:`epoll` available on Linux 2.5+ and
-:c:func:`kqueue` available on most BSD.
+This module provides access to the :c:func:`!select` and :c:func:`!poll` functions
+available in most operating systems, :c:func:`!devpoll` available on
+Solaris and derivatives, :c:func:`!epoll` available on Linux 2.5+ and
+:c:func:`!kqueue` available on most BSD.
 Note that on Windows, it only works for sockets; on other operating systems,
 it also works for other file types (in particular, on Unix, it works on pipes).
 It cannot be used on regular files to determine whether a file has grown since
@@ -41,10 +41,10 @@ The module defines the following:
    polling object; see section :ref:`devpoll-objects` below for the
    methods supported by devpoll objects.
 
-   :c:func:`devpoll` objects are linked to the number of file
+   :c:func:`!devpoll` objects are linked to the number of file
    descriptors allowed at the time of instantiation. If your program
-   reduces this value, :c:func:`devpoll` will fail. If your program
-   increases this value, :c:func:`devpoll` may return an
+   reduces this value, :c:func:`!devpoll` will fail. If your program
+   increases this value, :c:func:`!devpoll` may return an
    incomplete list of active file descriptors.
 
    The new file descriptor is :ref:`non-inheritable <fd_inheritance>`.
@@ -62,7 +62,7 @@ The module defines the following:
 
    *sizehint* informs epoll about the expected number of events to be
    registered.  It must be positive, or ``-1`` to use the default. It is only
-   used on older systems where :c:func:`epoll_create1` is not available;
+   used on older systems where :c:func:`!epoll_create1` is not available;
    otherwise it has no effect (though its value is still checked).
 
    *flags* is deprecated and completely ignored.  However, when supplied, its
@@ -117,7 +117,7 @@ The module defines the following:
 
 .. function:: select(rlist, wlist, xlist[, timeout])
 
-   This is a straightforward interface to the Unix :c:func:`select` system call.
+   This is a straightforward interface to the Unix :c:func:`!select` system call.
    The first three arguments are iterables of 'waitable objects': either
    integers representing file descriptors or objects with a parameterless method
    named :meth:`~io.IOBase.fileno` returning such an integer:
@@ -154,7 +154,7 @@ The module defines the following:
       .. index:: single: WinSock
 
       File objects on Windows are not acceptable, but sockets are.  On Windows,
-      the underlying :c:func:`select` function is provided by the WinSock
+      the underlying :c:func:`!select` function is provided by the WinSock
       library, and does not handle file descriptors that don't originate from
       WinSock.
 
@@ -169,7 +169,7 @@ The module defines the following:
 
    The minimum number of bytes which can be written without blocking to a pipe
    when the pipe has been reported as ready for writing by :func:`~select.select`,
-   :func:`poll` or another interface in this module.  This doesn't apply
+   :func:`!poll` or another interface in this module.  This doesn't apply
    to other kind of file-like objects such as sockets.
 
    This value is guaranteed by POSIX to be at least 512.
@@ -184,11 +184,11 @@ The module defines the following:
 ``/dev/poll`` Polling Objects
 -----------------------------
 
-Solaris and derivatives have ``/dev/poll``. While :c:func:`select` is
-O(highest file descriptor) and :c:func:`poll` is O(number of file
+Solaris and derivatives have ``/dev/poll``. While :c:func:`!select` is
+O(highest file descriptor) and :c:func:`!poll` is O(number of file
 descriptors), ``/dev/poll`` is O(active file descriptors).
 
-``/dev/poll`` behaviour is very close to the standard :c:func:`poll`
+``/dev/poll`` behaviour is very close to the standard :c:func:`!poll`
 object.
 
 
@@ -222,7 +222,7 @@ object.
    implement :meth:`!fileno`, so they can also be used as the argument.
 
    *eventmask* is an optional bitmask describing the type of events you want to
-   check for. The constants are the same that with :c:func:`poll`
+   check for. The constants are the same that with :c:func:`!poll`
    object. The default value is a combination of the constants :const:`POLLIN`,
    :const:`POLLPRI`, and :const:`POLLOUT`.
 
@@ -231,7 +231,7 @@ object.
       Registering a file descriptor that's already registered is not an
       error, but the result is undefined. The appropriate action is to
       unregister or modify it first. This is an important difference
-      compared with :c:func:`poll`.
+      compared with :c:func:`!poll`.
 
 
 .. method:: devpoll.modify(fd[, eventmask])
@@ -376,13 +376,13 @@ Edge and Level Trigger Polling (epoll) Objects
 Polling Objects
 ---------------
 
-The :c:func:`poll` system call, supported on most Unix systems, provides better
+The :c:func:`!poll` system call, supported on most Unix systems, provides better
 scalability for network servers that service many, many clients at the same
-time. :c:func:`poll` scales better because the system call only requires listing
-the file descriptors of interest, while :c:func:`select` builds a bitmap, turns
+time. :c:func:`!poll` scales better because the system call only requires listing
+the file descriptors of interest, while :c:func:`!select` builds a bitmap, turns
 on bits for the fds of interest, and then afterward the whole bitmap has to be
-linearly scanned again. :c:func:`select` is O(highest file descriptor), while
-:c:func:`poll` is O(number of file descriptors).
+linearly scanned again. :c:func:`!select` is O(highest file descriptor), while
+:c:func:`!poll` is O(number of file descriptors).
 
 
 .. method:: poll.register(fd[, eventmask])
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index 523d1ac..e53315b 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -562,7 +562,7 @@ The :mod:`signal` module defines the following functions:
 
    Note that installing a signal handler with :func:`signal` will reset the
    restart behaviour to interruptible by implicitly calling
-   :c:func:`siginterrupt` with a true *flag* value for the given signal.
+   :c:func:`!siginterrupt` with a true *flag* value for the given signal.
 
 
 .. function:: signal(signalnum, handler)
diff --git a/Doc/tools/.nitignore b/Doc/tools/.nitignore
index 818276a..fc6de10 100644
--- a/Doc/tools/.nitignore
+++ b/Doc/tools/.nitignore
@@ -56,7 +56,6 @@ Doc/glossary.rst
 Doc/howto/curses.rst
 Doc/howto/descriptor.rst
 Doc/howto/enum.rst
-Doc/howto/instrumentation.rst
 Doc/howto/isolating-extensions.rst
 Doc/howto/logging-cookbook.rst
 Doc/howto/logging.rst
diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst
index fb56690..ad899d5 100644
--- a/Doc/whatsnew/2.6.rst
+++ b/Doc/whatsnew/2.6.rst
@@ -2289,7 +2289,7 @@ changes, or look through the Subversion logs for all the details.
   (Contributed by Raymond Hettinger; :issue:`1861`.)
 
 * The :mod:`select` module now has wrapper functions
-  for the Linux :c:func:`epoll` and BSD :c:func:`kqueue` system calls.
+  for the Linux :c:func:`!epoll` and BSD :c:func:`!kqueue` system calls.
   :meth:`modify` method was added to the existing :class:`poll`
   objects; ``pollobj.modify(fd, eventmask)`` takes a file descriptor
   or file object and an event mask, modifying the recorded event mask
@@ -2328,7 +2328,7 @@ changes, or look through the Subversion logs for all the details.
   one for reading and one for writing.  The writable descriptor
   will be passed to :func:`set_wakeup_fd`, and the readable descriptor
   will be added to the list of descriptors monitored by the event loop via
-  :c:func:`select` or :c:func:`poll`.
+  :c:func:`!select` or :c:func:`!poll`.
   On receiving a signal, a byte will be written and the main event loop
   will be woken up, avoiding the need to poll.
 
@@ -2982,7 +2982,7 @@ Changes to Python's build process and to the C API include:
 
 * Python now must be compiled with C89 compilers (after 19
   years!).  This means that the Python source tree has dropped its
-  own implementations of :c:func:`memmove` and :c:func:`strerror`, which
+  own implementations of :c:func:`!memmove` and :c:func:`!strerror`, which
   are in the C89 standard library.
 
 * Python 2.6 can be built with Microsoft Visual Studio 2008 (version
diff --git a/Doc/whatsnew/2.7.rst b/Doc/whatsnew/2.7.rst
index 7bc68b0..4b5a31f 100644
--- a/Doc/whatsnew/2.7.rst
+++ b/Doc/whatsnew/2.7.rst
@@ -355,7 +355,7 @@ added as a more powerful replacement for the
 This means Python now supports three different modules for parsing
 command-line arguments: :mod:`getopt`, :mod:`optparse`, and
 :mod:`argparse`.  The :mod:`getopt` module closely resembles the C
-library's :c:func:`getopt` function, so it remains useful if you're writing a
+library's :c:func:`!getopt` function, so it remains useful if you're writing a
 Python prototype that will eventually be rewritten in C.
 :mod:`optparse` becomes redundant, but there are no plans to remove it
 because there are many scripts still using it, and there's no