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authorUlrich Drepper <drepper@redhat.com>2004-03-09 05:45:44 +0000
committerUlrich Drepper <drepper@redhat.com>2004-03-09 05:45:44 +0000
commitc072ef6d229b1c504e0cff58371df892ec289dec (patch)
treea00f967b2dc67a51684be7b6c33b9fe821ca12bb /nptl
parent02287d05a00c8bac1c20545cb0bad43725b5045c (diff)
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Update.
* sysdeps/i386/tcb-offsets.sym: Add PID. * sysdeps/unix/sysv/linux/i386/vfork.S: New file.
Diffstat (limited to 'nptl')
-rw-r--r--nptl/ChangeLog3
-rw-r--r--nptl/sysdeps/unix/sysv/linux/i386/vfork.S87
2 files changed, 89 insertions, 1 deletions
diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 01b09f0d3a..4d44b67d0b 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,6 +1,7 @@
2004-03-08 Ulrich Drepper <drepper@redhat.com>
- * nptl/sysdeps/i386/tcb-offsets.sym: Add PID.
+ * sysdeps/i386/tcb-offsets.sym: Add PID.
+ * sysdeps/unix/sysv/linux/i386/vfork.S: New file.
2004-03-08 Steven Munroe <sjmunroe@us.ibm.com>
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/vfork.S b/nptl/sysdeps/unix/sysv/linux/i386/vfork.S
new file mode 100644
index 0000000000..787453427b
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/i386/vfork.S
@@ -0,0 +1,87 @@
+/* Copyright (C) 1999, 2002, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Schwab <schwab@gnu.org>.
+
+ 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 <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+#include <kernel-features.h>
+#include <tcb-offsets.h>
+
+/* 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
+
+ /* Pop the return PC value into ECX. */
+ popl %ecx
+
+ /* Save the PID value. */
+ movl %gs:PID, %edx
+ movl $-1, %gs:PID
+
+ /* Stuff the syscall number in EAX and enter into the kernel. */
+ movl $SYS_ify (vfork), %eax
+ int $0x80
+
+ /* Jump to the return PC. Don't jump directly since this
+ disturbs the branch target cache. Instead push the return
+ address back on the stack. */
+ pushl %ecx
+
+ /* Restore the old PID value in the parent. In the child store 0. */
+ testl %eax, %eax
+ je 1f
+ movl %edx, %gs:PID
+
+1: cmpl $-4095, %eax
+ /* Branch forward if it failed. */
+# ifdef __ASSUME_VFORK_SYSCALL
+ jae SYSCALL_ERROR_LABEL
+.Lpseudo_end:
+# else
+ jae .Lerror
+# endif
+ ret
+
+# ifndef __ASSUME_VFORK_SYSCALL
+.Lerror:
+ /* Check if vfork syscall is known at all. */
+ cmpl $-ENOSYS, %eax
+ jne SYSCALL_ERROR_LABEL
+# endif
+#endif
+
+#ifndef __ASSUME_VFORK_SYSCALL
+ /* If we don't have vfork, fork is close enough. */
+
+ movl $SYS_ify (fork), %eax
+ int $0x80
+ cmpl $-4095, %eax
+ jae SYSCALL_ERROR_LABEL
+.Lpseudo_end:
+ ret
+#endif
+PSEUDO_END (__vfork)
+libc_hidden_def (__vfork)
+
+weak_alias (__vfork, vfork)