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Re: feature request: support specifying Unix socket with systemd directive OpenFile=
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From: Paul Gilmartin via curl-users <curl-users_at_lists.haxx.se>
Date: Thu, 22 Jun 2023 11:25:03 -0600
On 6/22/23 10:59:15, Erik Sjölund via curl-users wrote:
> On Thu, Jun 22, 2023 at 5:53 PM Dan Fandrich via curl-users
> <curl-users_at_lists.haxx.se> wrote:
>> How about just doing this like inetd and passing the fd in as stdin?
>
> Unfortunately, it's not possible here. File descriptors originating
> from OpenFile= are passed by systemd as file descriptor number 3 or
> higher.
POSIX supports remapping file descriptors with the dup2() function,
and (mentioned by POSIX but not required) many UNIX-like systems
provide "/dev/fd/descriptor-number to access descriptors as
pathnames. Does that help? Example using shell:
538 $ exec 5</etc/services 6<&5; ls -l /dev/fd
total 976
crw--w---- 1 paulgilm tty 0x10000001 Jun 22 11:14 0
crw--w---- 1 paulgilm tty 0x10000001 Jun 22 11:14 1
crw--w---- 1 paulgilm tty 0x10000001 Jun 22 11:14 2
drw-r--r-- 4 paulgilm wheel 128 Jun 22 09:03 3
dr--r--r-- 1 root wheel 0 Jun 21 20:35 4
-rw-r--r-- 1 root wheel 677977 Jun 9 09:31 5
-rw-r--r-- 1 root wheel 677977 Jun 9 09:31 6
539 $
Date: Thu, 22 Jun 2023 11:25:03 -0600
On 6/22/23 10:59:15, Erik Sjölund via curl-users wrote:
> On Thu, Jun 22, 2023 at 5:53 PM Dan Fandrich via curl-users
> <curl-users_at_lists.haxx.se> wrote:
>> How about just doing this like inetd and passing the fd in as stdin?
>
> Unfortunately, it's not possible here. File descriptors originating
> from OpenFile= are passed by systemd as file descriptor number 3 or
> higher.
POSIX supports remapping file descriptors with the dup2() function,
and (mentioned by POSIX but not required) many UNIX-like systems
provide "/dev/fd/descriptor-number to access descriptors as
pathnames. Does that help? Example using shell:
538 $ exec 5</etc/services 6<&5; ls -l /dev/fd
total 976
crw--w---- 1 paulgilm tty 0x10000001 Jun 22 11:14 0
crw--w---- 1 paulgilm tty 0x10000001 Jun 22 11:14 1
crw--w---- 1 paulgilm tty 0x10000001 Jun 22 11:14 2
drw-r--r-- 4 paulgilm wheel 128 Jun 22 09:03 3
dr--r--r-- 1 root wheel 0 Jun 21 20:35 4
-rw-r--r-- 1 root wheel 677977 Jun 9 09:31 5
-rw-r--r-- 1 root wheel 677977 Jun 9 09:31 6
539 $
-- gil -- Unsubscribe: https://lists.haxx.se/mailman/listinfo/curl-users Etiquette: https://curl.se/mail/etiquette.htmlReceived on 2023-06-22