On 12/12/22 18:53, Carlos O'Donell wrote:
On 12/9/22 14:49, Alejandro Colomar wrote:
Hi Jack,
On 12/2/22 23:44, Jack Pearson wrote:
Document that Linux will report EINVAL when exit_signal is specified and
either CLONE_THREAD or CLONE_PARENT is specified.
From clone3_args_valid in Linux:
```
if ((kargs->flags & (CLONE_THREAD | CLONE_PARENT)) &&
kargs->exit_signal)
return false;
```
I have verified that this happens on my kernel with a small program, and
that this doesn't happen with normal `clone` through the glibc helper.
Could you please also send a test program with the glibc wrapper?
BTW, glibc has a clone3(2) wrapper since last year. It would be interesting to document it instead of the raw syscall.
glibc does not have a clone3 wrapper.
glibc has an internal non-exported __clone3 interface that we use for pthreads,
and likely soon for posix_spawn.
We have not yet chosen to export clone3 as a public global symbol that developers
can use.
Ahhh, that's why I couldn't find it in the headers.
Incoming patch with the glibc clone wrapper test program.
Jack
