| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 Atmel Corporation |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU Lesser General |
| 5 | * Public License. See the file "COPYING.LIB" in the main directory of this |
| 6 | * archive for more details. |
| 7 | */ |
| 8 | #include <sched.h> |
| 9 | #include <errno.h> |
| 10 | #include <sys/syscall.h> |
| 11 | #include <unistd.h> |
| 12 | |
| 13 | /* |
| 14 | * I don't know if we can be absolutely certain that the fn and arg |
| 15 | * parameters are preserved when returning as the child. If the |
| 16 | * compiler stores them in registers (r0-r7), they should be. |
| 17 | */ |
| 18 | int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, ...) |
| 19 | { |
| 20 | register int (*_fn)(void *arg) = fn; |
| 21 | register void *_arg = arg; |
| 22 | int err; |
| 23 | |
| 24 | /* Sanity check the arguments */ |
| 25 | err = -EINVAL; |
| 26 | if (!fn) |
| 27 | goto syscall_error; |
| 28 | if (!child_stack) |
| 29 | goto syscall_error; |
| 30 | |
| 31 | err = INLINE_SYSCALL(clone, 2, flags, child_stack); |
| 32 | if (err < 0) |
| 33 | goto syscall_error; |
| 34 | else if (err != 0) |
| 35 | return err; |
| 36 | |
| 37 | _exit(_fn(_arg)); |
| 38 | |
| 39 | syscall_error: |
| 40 | __set_errno (-err); |
| 41 | return -1; |
| 42 | } |