projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 53ad957e UD |
1 | /* Copyright (C) 1999 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | Contributed by Andreas Schwab <schwab@gnu.org>. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Library General Public License as | |
| 7 | published by the Free Software Foundation; either version 2 of the | |
| 8 | License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Library General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Library General Public | |
| 16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 18 | Boston, MA 02111-1307, USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | #define _ERRNO_H 1 | |
| 22 | #include <bits/errno.h> | |
| 23 | ||
| 24 | /* Clone the calling process, but without copying the whole address space. | |
| 25 | The calling process is suspended until the new process exits or is | |
| 26 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 27 | and the process ID of the new process to the old process. */ | |
| 28 | ||
| 29 | ENTRY (__vfork) | |
| 30 | ||
| 31 | #ifdef __NR_vfork | |
| 32 | ||
| 33 | /* Pop the return PC value into ECX. */ | |
| 34 | popl %ecx | |
| 35 | ||
| 36 | /* Stuff the syscall number in EAX and enter into the kernel. */ | |
| 37 | movl $SYS_ify (vfork), %eax | |
| 38 | int $0x80 | |
| 39 | cmpl $-4095, %eax | |
| 40 | jae .Lerror /* Branch forward if it failed. */ | |
| 41 | ||
| 42 | /* Jump to the return PC. */ | |
| 43 | jmp *%ecx | |
| 44 | ||
| 45 | .Lerror: | |
| 46 | /* Push back the return PC. */ | |
| 47 | pushl %ecx | |
| 48 | ||
| 49 | /* Check if vfork syscall is known at all. */ | |
| 50 | cmpl $-ENOSYS, %eax | |
| 51 | jne SYSCALL_ERROR_LABEL | |
| 52 | ||
| 53 | #endif | |
| 54 | ||
| 55 | /* If we don't have vfork, fork is close enough. */ | |
| 56 | ||
| 57 | movl $SYS_ify (fork), %eax | |
| 58 | int $0x80 | |
| 59 | cmpl $-4095, %eax | |
| 60 | jae SYSCALL_ERROR_LABEL | |
| 61 | .Lpseudo_end: | |
| 62 | ret | |
| 63 | ||
| 64 | PSEUDO_END (__vfork) | |
| 65 | ||
| 66 | weak_alias (__vfork, vfork) |