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[LibOS] Emulate clone(CLONE_VFORK | CLONE_VM | SIGCHLD) as vfork()

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Some runtimes use clone(CLONE_VFORK | CLONE_VM | SIGCHLD) for vfork().
This commit is contained in:
Isaku Yamahata
2019-04-30 15:45:37 +02:00
committed by Michał Kowalczyk
parent bd72b968ee
commit ec4a3f7bb5
1 changed files with 7 additions and 0 deletions
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LibOS/shim/src/sys/shim_clone.c
+7
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@@ -171,6 +171,13 @@ int shim_do_clone (int flags, void * user_stack_addr, int * parent_tidptr,
int * set_parent_tid = NULL;
int ret = 0;
/* special case for vfork. some runtime uses clone() for vfork */
if (flags == (CLONE_VFORK | CLONE_VM | SIGCHLD) &&
user_stack_addr == NULL && parent_tidptr == NULL &&
child_tidptr == NULL && tls == NULL) {
return shim_do_vfork();
}
assert((flags & ~(CLONE_PARENT_SETTID|CLONE_CHILD_SETTID|
CLONE_CHILD_CLEARTID|CLONE_SETTLS|
CLONE_VM|CLONE_FILES|