diff options
author | Elliott Hughes <enh@google.com> | 2013-11-19 13:31:58 -0800 |
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committer | Elliott Hughes <enh@google.com> | 2013-11-19 14:08:54 -0800 |
commit | 36d6188f8cd8b948fb797f11d9620d63d0c2215a (patch) | |
tree | 86b3162cac031151b2ae44b4d554fce4f9456147 /libc/bionic/clone.cpp | |
parent | 318e86ed887e04e593f3db9b84b402d5501ced9b (diff) | |
download | bionic-36d6188f8cd8b948fb797f11d9620d63d0c2215a.tar.gz |
Clean up forking and cloning.
The kernel now maintains the pthread_internal_t::tid field for us,
and __clone was only used in one place so let's inline it so we don't
have to leave such a dangerous function lying around. Also rename
files to match their content and remove some useless #includes.
Change-Id: I24299fb4a940e394de75f864ee36fdabbd9438f9
Diffstat (limited to 'libc/bionic/clone.cpp')
-rw-r--r-- | libc/bionic/clone.cpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libc/bionic/clone.cpp b/libc/bionic/clone.cpp new file mode 100644 index 000000000..1d997fed7 --- /dev/null +++ b/libc/bionic/clone.cpp @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2010 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#define __GNU_SOURCE 1 +#include <sched.h> +#include <stdlib.h> +#include <stdarg.h> + +extern "C" pid_t __bionic_clone(uint32_t flags, void* child_stack, int* parent_tid, void* tls, int* child_tid, int (*fn)(void*), void* arg); +extern "C" void __exit(int status); + +// Called from the __bionic_clone assembler to call the thread function then exit. +extern "C" void __bionic_clone_entry(int (*fn)(void*), void* arg) { + int status = (*fn)(arg); + __exit(status); +} + +int clone(int (*fn)(void*), void* child_stack, int flags, void* arg, ...) { + int* parent_tid = NULL; + void* new_tls = NULL; + int* child_tid = NULL; + + // Extract any optional parameters required by the flags. + va_list args; + va_start(args, arg); + if ((flags & (CLONE_PARENT_SETTID|CLONE_SETTLS|CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) != 0) { + parent_tid = va_arg(args, int*); + } + if ((flags & (CLONE_SETTLS|CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) != 0) { + new_tls = va_arg(args, void*); + } + if ((flags & (CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) != 0) { + child_tid = va_arg(args, int*); + } + va_end(args); + + return __bionic_clone(flags, child_stack, parent_tid, new_tls, child_tid, fn, arg); +} |