diff options
| author | Ulrich Drepper <drepper@redhat.com> | 1999-01-19 15:34:49 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1999-01-19 15:34:49 +0000 |
| commit | d53afacb5553ca5c62a11c8185391afe0e745d9a (patch) | |
| tree | b9576e82e90ee9b7fc0379ef209236b88343efd5 /sysdeps/unix | |
| parent | 3ef4002b3ff17002a45627c45d62eace9d84b958 (diff) | |
| download | glibc-d53afacb5553ca5c62a11c8185391afe0e745d9a.tar.gz glibc-d53afacb5553ca5c62a11c8185391afe0e745d9a.tar.xz glibc-d53afacb5553ca5c62a11c8185391afe0e745d9a.zip | |
Update.
* sysdeps/unix/sysv/linux/i386/vfork.S: Rewrite to use clone. * sysdeps/unix/sysv/linux/bits/sched.h: Define CLONE_VFORK.
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/sched.h | 4 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/vfork.S | 40 |
2 files changed, 15 insertions, 29 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/sched.h b/sysdeps/unix/sysv/linux/bits/sched.h index 113bf4df5b..7e3c40eb4e 100644 --- a/sysdeps/unix/sysv/linux/bits/sched.h +++ b/sysdeps/unix/sysv/linux/bits/sched.h @@ -1,6 +1,6 @@ /* Definitions of constants and data structure for POSIX 1003.1b-1993 scheduling interface. - Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1998, 1999 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 @@ -39,6 +39,8 @@ # define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */ # define CLONE_PID 0x00001000 /* Set if pid shared. */ # define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */ +# define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to + wake it up on mm_release. */ #endif /* The official definition. */ diff --git a/sysdeps/unix/sysv/linux/i386/vfork.S b/sysdeps/unix/sysv/linux/i386/vfork.S index 118fccb613..1f6469a9a1 100644 --- a/sysdeps/unix/sysv/linux/i386/vfork.S +++ b/sysdeps/unix/sysv/linux/i386/vfork.S @@ -1,6 +1,6 @@ /* Copyright (C) 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. - Contributed by Andreas Schwab <schwab@gnu.org>. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. 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 @@ -28,37 +28,21 @@ ENTRY (__vfork) -#ifdef __NR_vfork + /* We have to use the clone() system call. The flags to use are + CLONE_VFORK | CLONE_VM + and we send SIGCHLD on termination (i.e., flags = 0x4111). */ - /* Pop the return PC value into ECX. */ - popl %ecx - - /* Stuff the syscall number in EAX and enter into the kernel. */ - movl $SYS_ify (vfork), %eax - int $0x80 - cmpl $-4095, %eax - jae .Lerror /* Branch forward if it failed. */ - - /* Jump to the return PC. */ - jmp *%ecx - -.Lerror: - /* Push back the return PC. */ - pushl %ecx - - /* Check if vfork syscall is known at all. */ - cmpl $-ENOSYS, %eax - jne SYSCALL_ERROR_LABEL - -#endif - - /* If we don't have vfork, fork is close enough. */ - - movl $SYS_ify (fork), %eax + popl %edx /* Pop return address. */ + pushl %ebx + movl %esp, %ecx + movl $0x4111, %ebx + movl $SYS_ify(clone), %eax int $0x80 + popl %ebx + pushl %edx cmpl $-4095, %eax jae SYSCALL_ERROR_LABEL -.Lpseudo_end: +L(pseudo_end): ret PSEUDO_END (__vfork) |