Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I../bash -I../bash/include -I../bash/lib -g -O2
uname output: Linux sc 2.6.17.11 #1 PREEMPT Sun Sep 24 13:29:05 BST 2006 i686
GNU/Linux
Machine Type: i486-pc-linux-gnu
Bash Version: 3.1
Patch Level: 17
Release Status: release
Description:
$ echo echo echo | bash -c '. /dev/fd/0'
$ echo echo echo | zsh -c '. /dev/fd/0'
echo
$ echo echo echo | ksh -c '. /dev/fd/0'
echo
$ echo echo echo | ash -c '. /dev/fd/0'
echo
$ echo echo echo | posh -c '. /dev/fd/0'
echo
Same problem if you do a ". fifo".
$ echo echo echo | strace bash -c '. /dev/fd/0'
[...]
stat64("/dev/fd/0", {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
open("/dev/fd/0", O_RDONLY|O_LARGEFILE) = 5
fstat64(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
read(5, "", 0) = 0
[...]
The problem being that bash does a stat on the file, and reads
st_size bytes from the file only, instead of reading til eof.
Repeat-By:
echo echo echo | bash -c '. /dev/fd/0'
Fix:
Not use stat(2).
I think the file should be read the same way as standard input
is read.
Like
echo 'echo echo echo >> a' > a
. ./a
should output "echo". (It does with ash, pdksh and zsh, not with
AT&T ksh). SUSv3 is not specific on that case.
--
Stephane
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