> Index: linux-2.6.12-rc3-mm3/include/linux/cn_fork.h
> ===================================================================
> --- linux-2.6.12-rc3-mm3.orig/include/linux/cn_fork.h 2003-01-30 11:24:37.000000000 +0100
> +++ linux-2.6.12-rc3-mm3/include/linux/cn_fork.h 2005-05-09 09:50:28.000000000 +0200
> @@ -0,0 +1,86 @@
> +/*
> + * cn_fork.h - Fork connector
> + *
> + * Copyright (C) 2005 Nguyen Anh Quynh <[email protected]>
> + * Copyright (C) 2005 Guillaume Thouvenin <[email protected]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program 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 General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + */
> +
> +#ifndef CN_FORK_H
> +#define CN_FORK_H
> +
> +#include <linux/connector.h>
> +
> +#define FORK_CN_STOP 0
> +#define FORK_CN_START 1
> +#define FORK_CN_STATUS 2
> +
> +struct cn_fork_msg
> +{
> + int cpu; /* ID of the cpu where the fork occured */
> + pid_t ppid; /* the parent PID */
> + pid_t cpid; /* the child PID */
> +};
> +
> +/* Code above is only inside the kernel */
> +#ifdef __KERNEL__
> +
> +extern int cn_already_initialized;
> +
> +#ifdef CONFIG_FORK_CONNECTOR
> +
> +#define CN_FORK_INFO_SIZE sizeof(struct cn_fork_msg)
> +#define CN_FORK_MSG_SIZE (sizeof(struct cn_msg) + CN_FORK_INFO_SIZE)
> +
> +extern int cn_fork_enable;
> +extern struct cb_id cb_fork_id;
> +
> +DECLARE_PER_CPU(unsigned long, fork_counts);
> +
> +static inline void fork_connector(pid_t parent, pid_t child)
> +{
> + if (cn_fork_enable) {
> + struct cn_msg *msg;
> + struct cn_fork_msg *forkmsg;
> + __u8 buffer[CN_FORK_MSG_SIZE];
> +
> + msg = (struct cn_msg *)buffer;
> +
> + memcpy(&msg->id, &cb_fork_id, sizeof(msg->id));
> +
> + msg->ack = 0; /* not used */
> + msg->seq = get_cpu_var(fork_counts)++;
> +
> + msg->len = CN_FORK_INFO_SIZE;
> + forkmsg = (struct cn_fork_msg *)msg->data;
> + forkmsg->cpu = smp_processor_id();
> + forkmsg->ppid = parent;
> + forkmsg->cpid = child;
> +
> + put_cpu_var(fork_counts);
> +
> + cn_netlink_send(msg, CN_IDX_FORK, GFP_ATOMIC);
Why is this GFP_ATOMIC?
> + }
> +}
> +#else
> +static inline void fork_connector(pid_t parent, pid_t child)
> +{
> + return;
> +}
> +#endif /* CONFIG_FORK_CONNECTOR */
> +#endif /* __KERNEL__ */
> +
> +#endif /* CN_FORK_H */
> Index: linux-2.6.12-rc3-mm3/include/linux/connector.h
> ===================================================================
> --- linux-2.6.12-rc3-mm3.orig/include/linux/connector.h 2005-05-09 07:45:56.000000000 +0200
> +++ linux-2.6.12-rc3-mm3/include/linux/connector.h 2005-05-09 09:50:01.000000000 +0200
> @@ -26,6 +26,8 @@
>
> #define CN_IDX_CONNECTOR 0xffffffff
> #define CN_VAL_CONNECTOR 0xffffffff
> +#define CN_IDX_FORK 0xfeed /* fork events */
> +#define CN_VAL_FORK 0xbeef
>
> /*
> * Maximum connector's message size.
> Index: linux-2.6.12-rc3-mm3/kernel/fork.c
> ===================================================================
> --- linux-2.6.12-rc3-mm3.orig/kernel/fork.c 2005-05-09 07:45:56.000000000 +0200
> +++ linux-2.6.12-rc3-mm3/kernel/fork.c 2005-05-09 08:03:15.000000000 +0200
> @@ -41,6 +41,7 @@
> #include <linux/profile.h>
> #include <linux/rmap.h>
> #include <linux/acct.h>
> +#include <linux/cn_fork.h>
>
> #include <asm/pgtable.h>
> #include <asm/pgalloc.h>
> @@ -63,6 +64,14 @@ DEFINE_PER_CPU(unsigned long, process_co
>
> EXPORT_SYMBOL(tasklist_lock);
>
> +#ifdef CONFIG_FORK_CONNECTOR
> +/*
> + * fork_counts is used by the fork_connector() inline routine as
> + * the sequence number of the netlink message.
> + */
> +static DEFINE_PER_CPU(unsigned long, fork_counts);
> +#endif /* CONFIG_FORK_CONNECTOR */
> +
The above should go into cn_fork.c
> int nr_processes(void)
> {
> int cpu;
> @@ -1252,6 +1261,8 @@ long do_fork(unsigned long clone_flags,
> if (unlikely (current->ptrace & PT_TRACE_VFORK_DONE))
> ptrace_notify ((PTRACE_EVENT_VFORK_DONE << 8) | SIGTRAP);
> }
> +
> + fork_connector(current->pid, p->pid);
Are you sure this is what you want? ->pid has a special meaning to the
kernel and doesn't necessarily mean the same to user-space, so I think
you want ->tgid here. If you look at sys_getpid() and sys_gettid()
you'll see what I mean.
> } else {
> free_pidmap(pid);
> pid = PTR_ERR(p);
>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
