[Bug 271038] "posixshmcontrol ls" gets an error when another user restricts some shared memory

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271038

            Bug ID: 271038
           Summary: "posixshmcontrol ls" gets an error when another user
                    restricts some shared memory
           Product: Base System
           Version: 12.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: rau8344@gmail.com

"posixshmcontrol ls" gets an error when another user restricts some shared
memory, meaning the current user does not have access to it. The return code of
the command is also 1, indicating the command failed, which could cause
problems in certain scripting scenarios. Within the output table, a line for
the inaccessible shared memory path is output: "posixshmcontrol: open <path>:
Permission denied".

Running as user1, output is like:
MODE            OWNER   GROUP   SIZE    PATH
rw-r--r--       user1   group1  1000    <some_path_a>
posixshmcontrol: open <some_path_b>: Permission denied
rw-r--r--       user1   group1  1000    <some_path_c>

Running with sudo, output is like:
MODE            OWNER   GROUP   SIZE    PATH
rw-r--r--       user1   group1  1000    <some_path_a>
rw-------       user2   group2  1000    <some_path_b>
rw-r--r--       user1   group1  1000    <some_path_c>

The posixshmcontrol(1) docs say that the ls subcommand should "List all linked
named shared memory segments visible to the caller." Since path owned by other
user does NOT appear to be visible to the caller, the ls subcommand should
probably ignore it completely.
MODE            OWNER   GROUP   SIZE    PATH
rw-r--r--       user1   group1  1000    <some_path_a>
rw-r--r--       user1   group1  1000    <some_path_c>

An alternative would be to add additional switches to control this behavior and
allow suppressing this error.

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