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// task information tapset
// Copyright (C) 2006 Intel Corporation.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
%{
#include <linux/version.h>
#include <linux/file.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
#include <linux/fdtable.h>
#endif
#ifndef STAPCONF_TASK_UID
#include <linux/cred.h>
#endif
%}
// Return the task_struct representing the current process
function task_current:long () %{ /* pure */
THIS->__retvalue = (long)current;
%}
// Return the parent task_struct of the given task
function task_parent:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
#if defined(STAPCONF_REAL_PARENT)
THIS->__retvalue = (long)kread(&(t->real_parent));
#else
THIS->__retvalue = (long)kread(&(t->parent));
#endif
CATCH_DEREF_FAULT();
%}
// Return the state of the given task, one of:
// TASK_RUNNING 0
// TASK_INTERRUPTIBLE 1
// TASK_UNINTERRUPTIBLE 2
// TASK_STOPPED 4
// TASK_TRACED 8
// EXIT_ZOMBIE 16
// EXIT_DEAD 32
function task_state:long (task:long)
{
return @cast(task, "task_struct", "kernel<linux/sched.h>")->state
}
// Return the name of the given task
function task_execname:string (task:long)
{
return kernel_string(@cast(task, "task_struct", "kernel<linux/sched.h>")->comm)
}
// Return the process id of the given task
function task_pid:long (task:long)
{
return @cast(task, "task_struct", "kernel<linux/sched.h>")->tgid
}
// Return the task of the given process id
function pid2task:long (pid:long) %{ /* pure */
struct task_struct *t = NULL;
pid_t t_pid = (pid_t)(long)THIS->pid;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)
struct pid *p_pid = find_get_pid(t_pid);
t = pid_task(p_pid, PIDTYPE_PID);
put_pid(p_pid);
#else
rcu_read_lock();
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
t = find_task_by_vpid (t_pid);
#else
t = find_task_by_pid (t_pid);
#endif /* 2.6.24 */
rcu_read_unlock();
#endif /* 2.6.31 */
THIS->__retvalue = (long)t;
%}
// Return the name of the given process id
function pid2execname:string (pid:long) {
tsk = pid2task(pid)
if (tsk)
return task_execname(tsk)
return ""
}
// Return the thread id of the given task
function task_tid:long (task:long)
{
return @cast(task, "task_struct", "kernel<linux/sched.h>")->pid
}
// Return the group id of the given task
function task_gid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
#ifdef STAPCONF_TASK_UID
THIS->__retvalue = kread(&(t->gid));
CATCH_DEREF_FAULT();
#else
/* XXX: We can't easily kread this rcu-protected field. */
/* XXX: no task_gid() in 2.6.28 */
struct cred *cred;
rcu_read_lock();
cred = get_task_cred (t);
rcu_read_unlock();
THIS->__retvalue = cred->gid;
#endif
%}
// Return the effective group id of the given task
function task_egid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
#ifdef STAPCONF_TASK_UID
THIS->__retvalue = kread(&(t->egid));
CATCH_DEREF_FAULT();
#else
/* XXX: We can't easily kread this rcu-protected field. */
/* XXX: no task_egid() in 2.6.28 */
struct cred *cred;
rcu_read_lock();
cred = get_task_cred (t);
rcu_read_unlock();
THIS->__retvalue = cred->egid;
#endif
%}
// Return the user id of the given task
function task_uid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
#ifdef STAPCONF_TASK_UID
THIS->__retvalue = kread(&(t->uid));
CATCH_DEREF_FAULT();
#else
/* XXX: We can't easily kread this rcu-protected field. */
THIS->__retvalue = task_uid (t);
#endif
%}
// Return the effective user id of the given task
function task_euid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
#ifdef STAPCONF_TASK_UID
THIS->__retvalue = kread(&(t->euid));
CATCH_DEREF_FAULT();
#else
/* XXX: We can't easily kread this rcu-protected field. */
THIS->__retvalue = task_euid (t);
#endif
%}
// Return the priority value of the given task
function task_prio:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
THIS->__retvalue = kread(&(t->prio)) - MAX_RT_PRIO;
CATCH_DEREF_FAULT();
%}
// Return the nice value of the given task
function task_nice:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(long)THIS->task;
THIS->__retvalue = kread(&(t->static_prio)) - MAX_RT_PRIO - 20;
CATCH_DEREF_FAULT();
%}
// Return the scheduled cpu for the given task
function task_cpu:long (task:long)
{
%( kernel_v >= "2.6.22" %?
ti = @cast(task, "task_struct", "kernel<linux/sched.h>")->stack
%:
ti = @cast(task, "task_struct", "kernel<linux/sched.h>")->thread_info
%)
return @cast(ti, "thread_info", "kernel<linux/sched.h>")->cpu
}
// Return the number of open file handlers for the given task
function task_open_file_handles:long (task:long)
%( kernel_v >= "2.6.15" %?
%{ /* pure */
int locked = 0;
unsigned int count=0, fd, max;
struct task_struct *t;
struct files_struct *fs;
struct fdtable *f;
t = (struct task_struct *)(long)THIS->task;
fs = kread(&(t->files));
f = kread(&(fs->fdt));
rcu_read_lock();
locked = 1;
max = kread(&(f->max_fds));
for (fd = 0; fd < max; fd++) {
if ( kread(&(f->fd[fd])) != NULL)
count ++;
}
THIS->__retvalue = count;
CATCH_DEREF_FAULT();
if (locked)
rcu_read_unlock();
%}
%:
%{ /* pure */
int locked = 0;
unsigned int count=0, fd, max;
struct task_struct *t;
struct files_struct *f;
t = (struct task_struct *)(long)THIS->task;
f = kread(&(t->files));
rcu_read_lock();
locked = 1;
max = kread(&(f->max_fds));
for (fd = 0; fd < max; fd++) {
if ( kread(&(f->fd[fd])) != NULL)
count ++;
}
THIS->__retvalue = count;
CATCH_DEREF_FAULT();
if (locked)
rcu_read_unlock();
%}
%)
// Return the maximum number of file handlers for the given task
function task_max_file_handles:long (task:long)
%( kernel_v >= "2.6.15" %?
%{ /* pure */
int locked = 0;
struct task_struct *t;
struct files_struct *fs;
struct fdtable *f;
t = (struct task_struct *)(long)THIS->task;
fs = kread (&(t->files));
f = kread(&(fs->fdt));
rcu_read_lock();
locked = 1;
THIS->__retvalue = kread(&(f->max_fds));
CATCH_DEREF_FAULT();
if (locked)
rcu_read_unlock();
%}
%:
%{ /* pure */
int locked = 0;
struct task_struct *t;
struct files_struct *f;
t = (struct task_struct *)(long)THIS->task;
f = kread(&(t->files));
rcu_read_lock();
locked = 1;
THIS->__retvalue = kread(&(f->max_fds));
CATCH_DEREF_FAULT();
if (locked)
rcu_read_unlock();
%}
%)
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