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authorAdhemerval Zanella Netto <adhemerval.zanella@linaro.org>2023-01-12 10:58:51 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2023-02-01 08:42:11 -0300
commit2053c11331991818882f7cf023ed2ce4ff44b274 (patch)
treeb1edaafb8036456c39bff1756ed8827922c0b3b5 /include
parent2290cf73cce1292d9345a8183fd29ae3994a9481 (diff)
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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.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/clone_internal.h b/include/clone_internal.h
index f8198d8..3b6cd85 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)