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devel / comp.lang.tcl / Re: exec under Unix/BSD/Linux

SubjectAuthor
* exec under Unix/BSD/LinuxRoderick
`* Re: exec under Unix/BSD/LinuxGerald Lester
 `* Re: exec under Unix/BSD/LinuxRoderick
  `- Re: exec under Unix/BSD/LinuxChristian Gollwitzer

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exec under Unix/BSD/Linux

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From: hruodr@gmail.com (Roderick)
Newsgroups: comp.lang.tcl
Subject: exec under Unix/BSD/Linux
Date: Wed, 4 May 2022 10:24:35 +0000
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 by: Roderick - Wed, 4 May 2022 10:24 UTC

I suppose, exec does not call a shell. Am I right?

Thanks
Rod.

Re: exec under Unix/BSD/Linux

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From: Gerald.Lester@KnG-Consulting.net (Gerald Lester)
Newsgroups: comp.lang.tcl
Subject: Re: exec under Unix/BSD/Linux
Date: Wed, 4 May 2022 07:39:52 -0500
Organization: KnG Consulting, LLC
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 by: Gerald Lester - Wed, 4 May 2022 12:39 UTC

On 5/4/22 05:24, Roderick wrote:
>
> I suppose, exec does not call a shell. Am I right?

Yes, that is correct -- exec does not "call" a shell, unless of course
you exec "/bin/sh" or such.

--
+----------------------------------------------------------------------+
| Gerald W. Lester, President, KNG Consulting LLC |
| Email: Gerald.Lester@kng-consulting.net |
+----------------------------------------------------------------------+

Re: exec under Unix/BSD/Linux

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From: hruodr@gmail.com (Roderick)
Newsgroups: comp.lang.tcl
Subject: Re: exec under Unix/BSD/Linux
Date: Wed, 4 May 2022 17:40:26 +0000
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 by: Roderick - Wed, 4 May 2022 17:40 UTC

On Wed, 4 May 2022, Gerald Lester wrote:

> On 5/4/22 05:24, Roderick wrote:
>>
>> I suppose, exec does not call a shell. Am I right?
>
> Yes, that is correct -- exec does not "call" a shell, unless of course you
> exec "/bin/sh" or such.

Thanks!

You a right, "call" is not the rith expression, but "hand the
argument to a command interpreter" like in "man sysem":

"The system() function hands the argument string to the command
interpreter sh(1). The calling process waits for the shell to finish
executing the command, ignoring SIGINT and SIGQUIT, and blocking
SIGCHLD."

Rod.

Re: exec under Unix/BSD/Linux

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From: auriocus@gmx.de (Christian Gollwitzer)
Newsgroups: comp.lang.tcl
Subject: Re: exec under Unix/BSD/Linux
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 by: Christian Gollwitzer - Wed, 4 May 2022 19:07 UTC

Am 04.05.22 um 19:40 schrieb Roderick:
>
> On Wed, 4 May 2022, Gerald Lester wrote:
>
>> On 5/4/22 05:24, Roderick wrote:
>>>
>>> I suppose, exec does not call a shell. Am I right?
>>
>> Yes, that is correct -- exec does not "call" a shell, unless of course
>> you exec "/bin/sh" or such.
>
> Thanks!
>
> You a right, "call" is not the rith expression, but "hand the
> argument to a command interpreter" like in "man sysem":
>
>      "The system() function hands the argument string to the command
>      interpreter sh(1).  The calling process waits for the shell to finish
>      executing the command, ignoring SIGINT and SIGQUIT, and blocking
>      SIGCHLD."

Still this is true - exec in Tcl does not start /bin/sh or the like.
Instead, it uses the exec syscall to execute the commands given and
parses the arguments etc. itself in order to mimic the shell and handle
redirections for stderr , pipes etc. That is also why the syntax for
redirections is slightly different from the shell etc.

Christian

devel / comp.lang.tcl / Re: exec under Unix/BSD/Linux

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