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| author | Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> | 2023-01-12 10:58:53 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-02-01 08:42:11 -0300 |
| commit | 98f9435f336cbee5d57a1a16373331ca1bc648db (patch) | |
| tree | f6e57c478194afb2323db3cba00db96e7582164b /include/clone_internal.h | |
| parent | 1e442efd57f231bf76030d7a30f2095d1261db20 (diff) | |
| download | glibc-98f9435f336cbee5d57a1a16373331ca1bc648db.tar.gz glibc-98f9435f336cbee5d57a1a16373331ca1bc648db.tar.xz glibc-98f9435f336cbee5d57a1a16373331ca1bc648db.zip | |
Linux: optimize clone3 internal usage
Add an optimization to avoid calling clone3 when glibc detects that there is no kernel support. It also adds __ASSUME_CLONE3, which allows skipping this optimization and issuing the clone3 syscall directly. It does not handle the the small window between 5.3 and 5.5 for posix_spawn (CLONE_CLEAR_SIGHAND was added in 5.5). Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'include/clone_internal.h')
| -rw-r--r-- | include/clone_internal.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/clone_internal.h b/include/clone_internal.h index 3b6cd85f02..dd380f119e 100644 --- a/include/clone_internal.h +++ b/include/clone_internal.h @@ -24,6 +24,11 @@ extern int __clone3 (struct clone_args *__cl_args, size_t __size, fall back to clone or clone2. */ extern int __clone_internal (struct clone_args *__cl_args, int (*__func) (void *__arg), void *__arg); +/* clone3 wrapper with a sticky check to avoid re-issuing the syscall if + it fails with ENOSYS. */ +extern int __clone3_internal (struct clone_args *cl_args, + int (*func) (void *args), void *arg) + attribute_hidden; /* The fallback code which calls clone/clone2 based on clone3 arguments. */ extern int __clone_internal_fallback (struct clone_args *__cl_args, int (*__func) (void *__arg), |