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Re: suppressing shell error output
From: |
Martin Sebor |
Subject: |
Re: suppressing shell error output |
Date: |
Tue, 13 Sep 2005 16:08:14 -0600 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050716 |
Paul D. Smith wrote:
%% Martin Sebor <address@hidden> writes:
ms> Is there an efficient way to suppress the error output of the shell
ms> in the $(shell) function?
Make can't do it. You can only do it from within the shell script
you're invoking.
There's no way the script could do it if it doesn't exist :) Or
did you mean that I should wrap the command foo in a script that
is guaranteed to exist and invoke it instead? That would work but
it's just as inefficient as my $(shell /bin/sh) hack: it causes
two processes to be executed instead of just one.
It seems that make should provide a mechanism to do it. After all,
it lets users decide what to do with the shell error output in all
other cases.
Looking at func_shell() in function.c, the block on lines 1641-1646
looks like the output I'm trying to suppress. It should only be a
matter of coming up with suitable syntax to let callers specify what
to do with the output. Since the @ character is used to suppress
command output elsewhere, perhaps make could reuse is here as well.
How about $(@shell)?
1636 /* The child_handler function will set
shell_function_completed
1637 to 1 when the child dies normally, or to -1 if it
1638 dies with status 127, which is most likely an exec
fail. */
1639
1640 if (shell_function_completed == -1)
1641 {
1642 /* This most likely means that the execvp failed,
1643 so we should just write out the error message
1644 that came in over the pipe from the child. */
1645 fputs (buffer, stderr);
1646 fflush (stderr);
1647 }
Martin
- suppressing shell error output, Martin Sebor, 2005/09/13
- Re: suppressing shell error output, Paul D. Smith, 2005/09/13
- Re: suppressing shell error output,
Martin Sebor <=
- Re: suppressing shell error output, Mike Frysinger, 2005/09/13
- Re: suppressing shell error output, Martin Sebor, 2005/09/13
- Re: suppressing shell error output, Mike Frysinger, 2005/09/13
- Re: suppressing shell error output, Martin Sebor, 2005/09/13
- Re: suppressing shell error output, Mike Frysinger, 2005/09/13
- Re: suppressing shell error output, Martin Sebor, 2005/09/13
- Re: suppressing shell error output, Mike Frysinger, 2005/09/13
- Re: suppressing shell error output, Martin Sebor, 2005/09/13