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-rw-r--r--sysdeps/unix/sysv/linux/clone-internal.c24
-rw-r--r--sysdeps/unix/sysv/linux/kernel-features.h9
2 files changed, 32 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/clone-internal.c b/sysdeps/unix/sysv/linux/clone-internal.c
index e125c91..790739c 100644
--- a/sysdeps/unix/sysv/linux/clone-internal.c
+++ b/sysdeps/unix/sysv/linux/clone-internal.c
@@ -76,6 +76,28 @@ __clone_internal_fallback (struct clone_args *cl_args,
return ret;
}
+int
+__clone3_internal (struct clone_args *cl_args, int (*func) (void *args),
+ void *arg)
+{
+#ifdef HAVE_CLONE3_WRAPPER
+# if __ASSUME_CLONE3
+ return __clone3 (cl_args, sizeof (*cl_args), func, arg);
+# else
+ static int clone3_supported = 1;
+ if (atomic_load_relaxed (&clone3_supported) == 1)
+ {
+ int ret = __clone3 (cl_args, sizeof (*cl_args), func, arg);
+ if (ret != -1 || errno != ENOSYS)
+ return ret;
+
+ atomic_store_relaxed (&clone3_supported, 0);
+ }
+# endif
+#endif
+ __set_errno (ENOSYS);
+ return -1;
+}
int
__clone_internal (struct clone_args *cl_args,
@@ -83,7 +105,7 @@ __clone_internal (struct clone_args *cl_args,
{
#ifdef HAVE_CLONE3_WRAPPER
int saved_errno = errno;
- int ret = __clone3 (cl_args, sizeof (*cl_args), func, arg);
+ int ret = __clone3_internal (cl_args, func, arg);
if (ret != -1 || errno != ENOSYS)
return ret;
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index a23d007..4b5c4af 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -241,4 +241,13 @@
# define __ASSUME_FUTEX_LOCK_PI2 0
#endif
+/* The clone3 system call was introduced across on most architectures in
+ Linux 5.3. Not all ports implements it, so it should be used along
+ HAVE_CLONE3_WRAPPER define. */
+#if __LINUX_KERNEL_VERSION >= 0x050300
+# define __ASSUME_CLONE3 1
+#else
+# define __ASSUME_CLONE3 0
+#endif
+
#endif /* kernel-features.h */