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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.
Cc: stable@vger.kernel.org
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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|---|---|---|
| .. | ||
| drivers | ||
| skas | ||
| aio.c | ||
| elf_aux.c | ||
| execvp.c | ||
| file.c | ||
| helper.c | ||
| irq.c | ||
| main.c | ||
| Makefile | ||
| mem.c | ||
| process.c | ||
| registers.c | ||
| sigio.c | ||
| signal.c | ||
| start_up.c | ||
| time.c | ||
| tty.c | ||
| umid.c | ||
| user_syms.c | ||
| util.c | ||