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Re: time builtin handles backgrounding poorly
From: |
Chet Ramey |
Subject: |
Re: time builtin handles backgrounding poorly |
Date: |
Thu, 13 Sep 2007 22:21:26 -0400 |
User-agent: |
Thunderbird 2.0.0.6 (Macintosh/20070728) |
Jack Lloyd wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: x86_64-redhat-linux-gcc
> Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-redhat-linux-gnu'
> -DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
> -DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -D_GNU_SOURCE -O2 -g
> -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
> --param=ssp-buffer-size=4 -m64 -mtune=generic
> uname output: Linux wks9 2.6.15-1.2054_FC5 #1 SMP Tue Mar 14 15:48:20 EST
> 2006 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-redhat-linux-gnu
>
> Bash Version: 3.1
> Patch Level: 7
> Release Status: release
>
> Description:
>
> The time builtin seems to be confused if something is
> backgrounded, and prints immediately the time rather than
> waiting for the job to complete. I found this very unexpected.
`time' is not a builtin; it is a shell reserved word that causes timing
information to be printed when `waitpid' returns. It's a synchronous
operation that doesn't interact as you'd like with job control.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Live Strong. No day but today.
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/