(yes, the above code is dumb and I have squashed it, to just keep the max
fd without a slice ... it just started out with something else)
On Friday 8 November 2024 at 10:39:12 UTC Peter Galbavy wrote:
> Having added this, the child process now does not inherit those FDs:
>
> // mark all non-std fds unshared
> cmd.ExtraFiles = []*os.File{}
>
> // un-inherit all FDs explicitly
> fds, err := os.ReadDir("/proc/self/fd")
> if err != nil {
> return
> }
> var intfds []int
> for _, f := range fds {
> if i, err := strconv.Atoi(f.Name()); err == nil {
> intfds = append(intfds, i)
> }
> }
>
> maxfd := slices.Max(intfds)
> for i := 0; i < maxfd-3; i++ {
> cmd.ExtraFiles = append(cmd.ExtraFiles, nil)
> }
>
> Is this a bug (known or otherwise) or am I just doing the original
> cmd.Start() wrong?
> On Friday 8 November 2024 at 10:18:27 UTC Peter Galbavy wrote:
>
>> I have a command line manager tool that builds the starting environment
>> for a process and calls cmd.Start().
>>
>> The code sets (doesn't need to as it starts as nil, but does to be extra
>> explicit) cmd.ExtraFiles = nil, but even then I seem to inherit a bunch of
>> FDs from the CLI - I noticed because the oddities belong to VSCode terminal
>> (cmd dump first, just before to call to cmd.Start()):
>>
>> 2024-11-08T10:08:09Z DEBUG: pkg/host/local.go:221 host.(*Local).Start() >
>> cordial: cmd:
>> &exec.Cmd{Path:"/home/peter/geneos/packages/gateway/active_prod/gateway2.linux_64",
>>
>> Args:[]string{"/home/peter/geneos/packages/gateway/active_prod/gateway2.linux_64",
>>
>> "Demo Gateway", "-gateway-name", "Demo Gateway", "-resources-dir",
>> "/home/peter/geneos/packages/gateway/active_prod/resources", "-log",
>> "/home/peter/geneos/gateway/gateways/Demo Gateway/gateway.log", "-setup",
>> "/home/peter/geneos/gateway/gateways/Demo Gateway/gateway.setup.xml",
>> "-licd-host", "localhost", "-ssl-certificate",
>> "/home/peter/geneos/gateway/gateways/Demo Gateway/gateway.pem",
>> "-ssl-certificate-key", "/home/peter/geneos/gateway/gateways/Demo
>> Gateway/gateway.key", "-ssl-certificate-chain",
>> "/home/peter/geneos/gateway/gateways/Demo Gateway/chain.pem",
>> "-licd-secure", "-key-file",
>> "/home/peter/geneos/gateway/gateway_shared/keyfiles/06761949.aes",
>> "-previous-key-file",
>> "/home/peter/geneos/gateway/gateway_shared/keyfiles/740424C5.aes"},
>> Env:[]string{"TEST2=memory", "TEST=mytest2",
>> "LD_LIBRARY_PATH=/home/peter/geneos/packages/gateway/active_prod/lib64:/usr/lib64"},
>>
>> Dir:"/home/peter/geneos/gateway/gateways/Demo Gateway",
>> Stdin:io.Reader(nil), Stdout:(*os.File)(0xc000166288),
>> Stderr:(*os.File)(0xc000166288), ExtraFiles:[]*os.File(nil),
>> SysProcAttr:(*syscall.SysProcAttr)(0xc000000840),
>> Process:(*os.Process)(nil), ProcessState:(*os.ProcessState)(nil),
>> ctx:context.Context(nil), Err:error(nil), Cancel:(func() error)(nil),
>> WaitDelay:0, childIOFiles:[]io.Closer(nil), parentIOPipes:[]io.Closer(nil),
>> goroutine:[]func() error(nil), goroutineErr:(<-chan error)(nil),
>> ctxResult:(<-chan exec.ctxResult)(nil), createdByStack:[]uint8(nil),
>> lookPathErr:error(nil), cachedLookExtensions:struct { in string; out string
>> }{in:"", out:""}}
>> gateway "Demo Gateway" started with PID 55903
>>
>> FDs 19 and above seem to be inherited:
>>
>> peter@thinkpad:~/cordial/tools/geneos$ lsof -p 55903
>> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
>> gateway2. 55903 peter cwd DIR 259,2 4096 22284207
>> /home/peter/geneos/gateway/gateways/Demo Gateway
>> gateway2. 55903 peter rtd DIR 259,2 4096 2 /
>> ...
>> gateway2. 55903 peter 19w REG 259,2 6014 22857682
>> /home/peter/.vscode-server/data/logs/20241108T084719/remoteagent.log
>> gateway2. 55903 peter 20w REG 259,2 2000 22857683
>> /home/peter/.vscode-server/data/logs/20241108T084719/ptyhost.log
>> gateway2. 55903 peter 21u CHR 5,2 0t0 91 /dev/ptmx
>> gateway2. 55903 peter 22u CHR 5,2 0t0 91 /dev/ptmx
>> gateway2. 55903 peter 23u CHR 5,2 0t0 91 /dev/ptmx
>>
>> Am I missing anything?
>>
>> Code (which is far from clean, sorry) is scattered around
>> https://github.com/ITRS-Group/cordial/blob/main/pkg/host/local.go#L214
>>
>
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