projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 | 1 | /* |
| 9385eb3d | 2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved. |
| e9ce8d39 A |
3 | * |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 734aad71 | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| e9ce8d39 | 7 | * |
| 734aad71 A |
8 | * This file contains Original Code and/or Modifications of Original Code |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| e9ce8d39 A |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 734aad71 A |
19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| e9ce8d39 A |
22 | * |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | /* | |
| 26 | * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved | |
| 27 | */ | |
| 28 | #include "SYS.h" | |
| 29 | ||
| 9385eb3d A |
30 | .data |
| 31 | .private_extern __current_pid | |
| 32 | __current_pid: | |
| 33 | .long 0 | |
| 34 | L__current_pid_addr = __current_pid | |
| 35 | ||
| 36 | #if defined(__DYNAMIC__) | |
| 37 | #define GET_CURRENT_PID \ | |
| 38 | call 0f ; \ | |
| 39 | 0: ; \ | |
| 40 | popl %ecx ; \ | |
| 41 | leal L__current_pid_addr-0b(%ecx), %ecx | |
| 42 | ||
| 43 | #define __current_pid (%ecx) | |
| 44 | ||
| 45 | #else | |
| 46 | #define GET_CURRENT_PID | |
| 47 | #endif | |
| 48 | ||
| 49 | /* | |
| 50 | * If __current_pid is > 0, return it, else make syscall. | |
| 51 | * If __current_pid is 0, cache result of syscall. | |
| 52 | */ | |
| 53 | TEXT | |
| 54 | LEAF(_getpid, 0) | |
| 55 | GET_CURRENT_PID | |
| 56 | movl __current_pid, %eax | |
| 57 | testl %eax, %eax | |
| 58 | jle 1f | |
| 59 | ret | |
| 60 | 1: | |
| 61 | UNIX_SYSCALL_NONAME(getpid, 0) | |
| 62 | movl %eax, %edx | |
| 63 | xorl %eax, %eax | |
| 64 | lock | |
| 65 | cmpxchgl %edx, __current_pid | |
| 66 | movl %edx, %eax | |
| 67 | ret |