--- /dev/null
+/* Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <sysdep.h>
+
+#ifndef SYS_vfork
+#define SYS_vfork 66
+#endif
+
+/* Clone the calling process, but without copying the whole address space.
+ The the calling process is suspended until the 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. */
+.globl ___vfork
+___vfork:
+ /* Pop the return PC value into A0. */
+ moveal sp@+, a0
+
+ /* Stuff the syscall number in D0 and trap into the kernel. */
+ movel #SYS_vfork, d0
+ trap #0
+ bcs error /* Branch forward if it failed. */
+
+ /* It succeeded. See which fork we're in. D1 is now 0 for the
+ parent and 1 for the child. Decrement it to make it -1 (all
+ bits set) for the parent, and 0 (no bits set) for the child.
+ Then AND it with D0, so the parent gets D0&-1==R0, and the child
+ gets D0&0==0. */
+ subl #1, d1
+ andl d1, d0
+
+ /* Jump to the return PC. */
+ jmp a0@
+
+error:
+ movel d0, _errno
+ moveq #-1, d0
+ jmp a0@
+
+weak_alias (__vfork, vfork)
--- /dev/null
+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <sysdep.h>
+
+#ifndef SYS_vfork
+#define SYS_vfork 66
+#endif
+
+/* Clone the calling process, but without copying the whole address space.
+ The the calling process is suspended until the 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. */
+.globl ___vfork
+___vfork:
+ /* Pop the return PC value into A0. */
+ movel sp@+, a0
+
+ /* Push the syscall number and trap into the kernel. */
+ movel #SYS_vfork, sp@-
+ trap #0
+ bcs error /* Branch forward if it failed. */
+
+ /* It succeeded. See which fork we're in. D1 is now 0 for the
+ parent and 1 for the child. Decrement it to make it -1 (all
+ bits set) for the parent, and 0 (no bits set) for the child.
+ Then AND it with D0, so the parent gets D0&-1==R0, and the child
+ gets D0&0==0. */
+ decl d1
+ andl d1, d0
+
+ /* Jump to the return PC. */
+ jmp a0@
+
+error:
+ movel d0, _errno
+ moveq #-1, d0
+ jmp a0@
+
+weak_alias (__vfork, vfork)
--- /dev/null
+/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <sysdep.h>
+
+#ifndef SYS_vfork
+#define SYS_vfork 66
+#endif
+
+/* Clone the calling process, but without copying the whole address space.
+ The the calling process is suspended until the 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. */
+.globl ___vfork
+error: jmp syscall_error
+___vfork:
+ .word 0
+ /* Save our return address in R2, and return to code below. */
+ movl 16(fp), r2
+ movab unwind, 16(fp)
+ ret
+unwind:
+ /* Do the system call. */
+ chmk $SYS_vfork
+ bcs error
+
+ tstl r1
+ beq parent
+
+ /* We are the child. Return zero. */
+ clrl r0
+
+ /* Return to the saved address. */
+parent: jmp (r2)
+
+.globl _errno
+error:
+ movl r0, _errno
+ mnegl $1, r0
+ jmp (r2)
+
+weak_alias (__vfork, vfork)
projects / platform / upstream / glibc.git / commitdiff