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| author | Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> | 2023-01-12 10:58:51 -0300 |
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| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-02-01 08:42:11 -0300 |
| commit | 2053c11331991818882f7cf023ed2ce4ff44b274 (patch) | |
| tree | b1edaafb8036456c39bff1756ed8827922c0b3b5 /include | |
| parent | 2290cf73cce1292d9345a8183fd29ae3994a9481 (diff) | |
| download | glibc-2053c11331991818882f7cf023ed2ce4ff44b274.tar.gz glibc-2053c11331991818882f7cf023ed2ce4ff44b274.tar.xz glibc-2053c11331991818882f7cf023ed2ce4ff44b274.zip | |
linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawn
The clone3 flag resets all signal handlers of the child not set to SIG_IGN to SIG_DFL. It allows to skip most of the sigaction calls to setup child signal handling, where previously a posix_spawn had to issue 2 times NSIG sigaction calls (one to obtain the current disposition and another to set either SIG_DFL or SIG_IGN). With POSIX_SPAWN_SETSIGDEF the child will setup the signal for the case where the disposition is SIG_IGN. The code must handle the fallback where clone3 is not available. This is done by splitting __clone_internal_fallback from __clone_internal. Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'include')
| -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 f8198d8059..3b6cd85f02 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); +/* 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), + void *__arg) + attribute_hidden; #ifndef _ISOMAC libc_hidden_proto (__clone3) |