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Date: Sun, 16 Feb 2025 23:33:52 +0100
Message-ID: <CAPJSo4VH0MufLhpgPiD1GV1gFsbTLdtOKrP82eaA_Yv_DHPXEQ@mail.gmail.com>
Subject: WinAPI spawn() not used by Cygwin posix_spawn()? Re: [PATCH] Cygwin:
 Add spawn family of functions to docs
To: cygwin-patches AT cygwin DOT com, cygwin AT cygwin DOT com
From: Lionel Cons via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Lionel Cons <lionelcons1972 AT gmail DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Sun, 16 Feb 2025 at 22:47, Mark Geisert <mark AT maxrnd DOT com> wrote:
>
> In the doc tree, change the title of section "Other UNIX system
> interfaces..." to "Other system interfaces...".  Add the spawn family of
> functions noting their origin as Windows.

re spawn() family: Cygwin posix_spawn() seems to rely on the rather
inefficient vfork(), while Opengroup intended it to be an API to
Windows spawn().

Is there a technical limitation why Cygwin posix_spawn() cannot use
WinAPI spawn() directly?

Lionel

>
> The title change seems warranted as neither the spawn family of
> functions nor the listed clock_setres() function originated from UNIX
> systems.
>
> ---
>  winsup/doc/posix.xml | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/winsup/doc/posix.xml b/winsup/doc/posix.xml
> index 26d4fcfa4..3d2dac086 100644
> --- a/winsup/doc/posix.xml
> +++ b/winsup/doc/posix.xml
> @@ -1559,7 +1559,7 @@ also IEEE Std 1003.1-2017 (POSIX.1-2017).</para>
>
>  </sect1>
>
> -<sect1 id="std-deprec"><title>Other UNIX system interfaces, not in POSIX.1-2008 or deprecated:</title>
> +<sect1 id="std-deprec"><title>Other system interfaces, not in POSIX.1-2008 or deprecated:</title>
>
>  <screen>
>      bcmp                       (POSIX.1-2001, SUSv3)
> @@ -1568,6 +1568,7 @@ also IEEE Std 1003.1-2017 (POSIX.1-2017).</para>
>      chroot                     (SUSv2)         (see <xref linkend="std-notes">chapter "Implementation Notes"</xref>)
>      clock_setres               (QNX, VxWorks)  (see <xref linkend="std-notes">chapter "Implementation Notes"</xref>)
>      cuserid                    (POSIX.1-1988, SUSv2)
> +    cwait                      (Windows)
>      ecvt                       (SUSv3)
>      endutent                   (XPG2)
>      fcvt                       (SUSv3)
> @@ -1602,6 +1603,14 @@ also IEEE Std 1003.1-2017 (POSIX.1-2017).</para>
>      scalb                      (SUSv3)
>      setcontext                 (SUSv3)
>      setutent                   (XPG2)
> +    spawnl                     (Windows)
> +    spawnle                    (Windows)
> +    spawnlp                    (Windows)
> +    spawnlpe                   (Windows)
> +    spawnv                     (Windows)
> +    spawnve                    (Windows)
> +    spawnvp                    (Windows)
> +    spawnvpe                   (Windows)
>      stime                      (SVID)
>      swapcontext                        (SUSv3)
>      sys_errlist                        (BSD)
> --
> 2.45.1
>


-- 
Lionel

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