9cbb43b99b
commit 0754fb298f2f2719f0393491d010d46cfb25d043 upstream.
I was seeing some really weird behaviour where piping UML's output
somewhere would cause output to get duplicated:
$ ./vmlinux | head -n 40
Checking that ptrace can change system call numbers...Core dump limits :
soft - 0
hard - NONE
OK
Checking syscall emulation patch for ptrace...Core dump limits :
soft - 0
hard - NONE
OK
Checking advanced syscall emulation patch for ptrace...Core dump limits :
soft - 0
hard - NONE
OK
Core dump limits :
soft - 0
hard - NONE
This is because these tests do a fork() which duplicates the non-empty
stdout buffer, then glibc flushes the duplicated buffer as each child
exits.
A simple workaround is to flush before forking.
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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| .. | ||
| drivers | ||
| include | ||
| kernel | ||
| os-Linux | ||
| scripts | ||
| sys-ia64 | ||
| sys-ppc | ||
| .gitignore | ||
| Kconfig.char | ||
| Kconfig.common | ||
| Kconfig.debug | ||
| Kconfig.net | ||
| Kconfig.rest | ||
| Kconfig.um | ||
| Makefile | ||
| Makefile-ia64 | ||
| Makefile-os-Linux | ||
| Makefile-ppc | ||
| Makefile-skas | ||
| defconfig | ||