/* Copyright (C) 1999, 2002, 2003, 2010 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Andreas Schwab . The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include #define _ERRNO_H 1 #include #include #ifndef SAVE_PID #define SAVE_PID #endif #ifndef RESTORE_PID #define RESTORE_PID #endif /* Clone the calling process, but without copying the whole address space. The calling process is suspended until the new process exits or is replaced by a call to `execve'. Return -1 for errors, 0 to the new process, and the process ID of the new process to the old process. */ ENTRY (__vfork) #ifdef __NR_vfork /* SAVE_PID clobbers call-clobbered registers and saves data in D1 and A1. */ SAVE_PID /* Pop the return PC value into A0. */ movel %sp@+, %a0 /* Stuff the syscall number in D0 and trap into the kernel. */ movel #SYS_ify (vfork), %d0 trap #0 RESTORE_PID tstl %d0 jmi .Lerror /* Branch forward if it failed. */ /* Jump to the return PC. */ jmp %a0@ .Lerror: /* Push back the return PC. */ movel %a0,%sp@- # ifdef __ASSUME_VFORK_SYSCALL # ifndef PIC jbra SYSCALL_ERROR_LABEL # endif # else /* Check if vfork syscall is known at all. */ movel #-ENOSYS,%d1 cmpl %d0,%d1 jne SYSCALL_ERROR_LABEL # endif #endif #ifndef __ASSUME_VFORK_SYSCALL /* If we don't have vfork, fork is close enough. */ movel #SYS_ify (fork), %d0 trap #0 tstl %d0 jmi SYSCALL_ERROR_LABEL rts #endif PSEUDO_END (__vfork) libc_hidden_def (__vfork) weak_alias (__vfork, vfork)