projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f7a9f785 | 1 | /* Copyright (C) 2003-2016 Free Software Foundation, Inc. |
| b398ae3c UD |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| b398ae3c UD |
17 | |
| 18 | #include <sysdep.h> | |
| 19 | #define _ERRNO_H 1 | |
| 20 | #include <bits/errno.h> | |
| 3d1024e8 | 21 | #include <tcb-offsets.h> |
| b398ae3c UD |
22 | |
| 23 | /* Clone the calling process, but without copying the whole address space. | |
| 24 | The calling process is suspended until the new process exits or is | |
| 25 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 26 | and the process ID of the new process to the old process. */ | |
| 27 | ||
| 28 | ENTRY (__vfork) | |
| 3d1024e8 AZ |
29 | |
| 30 | /* Load the TCB-cached PID value and negates it. If It it is zero | |
| 31 | sets it to 0x800000. And then sets its value again on TCB field. | |
| 32 | See raise.c for the logic that relies on this value. */ | |
| 33 | ||
| 34 | lwz r0,PID(r2) | |
| 35 | cmpwi cr0,r0,0 | |
| 36 | neg r0,r0 | |
| 37 | bne- cr0,1f | |
| 38 | lis r0,0x8000 | |
| 39 | 1: stw r0,PID(r2) | |
| 40 | ||
| b398ae3c | 41 | DO_CALL (SYS_ify (vfork)) |
| 3d1024e8 AZ |
42 | |
| 43 | cmpwi cr1,r3,0 | |
| 44 | beqlr- 1 | |
| 45 | ||
| 46 | /* Restore the original value of the TCB cache of the PID, if we're | |
| 47 | the parent. But in the child (syscall return value equals zero), | |
| 48 | leave things as they are. */ | |
| 49 | lwz r0,PID(r2) | |
| 50 | /* Cannot use clrlwi. here, because cr0 needs to be preserved | |
| 51 | until PSEUDO_RET. */ | |
| 52 | clrlwi r4,r0,1 | |
| 53 | cmpwi cr1,r4,0 | |
| 54 | beq- cr1,1f | |
| 55 | neg r4,r0 | |
| 56 | 1: stw r4,PID(r2) | |
| 57 | ||
| b398ae3c | 58 | PSEUDO_RET |
| 3d1024e8 | 59 | |
| b398ae3c UD |
60 | PSEUDO_END (__vfork) |
| 61 | libc_hidden_def (__vfork) | |
| 62 | ||
| 63 | weak_alias (__vfork, vfork) | |
| 3d1024e8 | 64 | strong_alias (__vfork, __libc_vfork) |