[RFC] un petite hack: /proc/*/ctl
From: Alexey Dobriyan
Date: Mon Nov 28 2005 - 19:12:51 EST
echo kill >/proc/$PID/ctl
send SIGKILL to process
echo term >/proc/$PID/ctl
send SIGTERM to process
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -71,6 +71,7 @@
#include <linux/cpuset.h>
#include <linux/audit.h>
#include <linux/poll.h>
+#include <linux/syscalls.h>
#include "internal.h"
/*
@@ -125,6 +126,7 @@ enum pid_directory_inos {
#endif
PROC_TGID_OOM_SCORE,
PROC_TGID_OOM_ADJUST,
+ PROC_TGID_CTL,
PROC_TID_INO,
PROC_TID_STATUS,
PROC_TID_MEM,
@@ -165,6 +167,7 @@ enum pid_directory_inos {
#endif
PROC_TID_OOM_SCORE,
PROC_TID_OOM_ADJUST,
+ PROC_TID_CTL,
/* Add new entries before this */
PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
@@ -220,6 +223,7 @@ static struct pid_entry tgid_base_stuff[
#ifdef CONFIG_AUDITSYSCALL
E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
#endif
+ E(PROC_TGID_CTL, "ctl", S_IFREG|S_IWUSR),
{0,0,NULL,0}
};
static struct pid_entry tid_base_stuff[] = {
@@ -262,6 +266,7 @@ static struct pid_entry tid_base_stuff[]
#ifdef CONFIG_AUDITSYSCALL
E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
#endif
+ E(PROC_TID_CTL, "ctl", S_IFREG|S_IWUSR),
{0,0,NULL,0}
};
@@ -942,6 +947,42 @@ static struct file_operations proc_oom_a
.write = oom_adjust_write,
};
+static ssize_t ctl_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char __buf[5];
+ struct task_struct *task;
+ int sig;
+
+ count = min(count, sizeof(__buf));
+ memset(__buf, 0, sizeof(__buf));
+ if (copy_from_user(__buf, buf, count))
+ return -EFAULT;
+ __buf[sizeof(__buf) - 1] = '\0';
+
+enum {
+ CONFIG_BOFH = 0,
+};
+
+ if (strcmp(__buf, "kill") == 0)
+ sig = SIGKILL;
+ else if (CONFIG_BOFH && strcmp(__buf, "FOAD") == 0)
+ sig = SIGKILL;
+ else if (strcmp(__buf, "term") == 0)
+ sig = SIGTERM;
+ else
+ goto exit;
+
+ task = proc_task(file->f_dentry->d_inode);
+ sys_kill(task->pid, sig);
+exit:
+ return count;
+}
+
+static struct file_operations proc_ctl_operations = {
+ .write = ctl_write,
+};
+
static struct inode_operations proc_mem_inode_operations = {
.permission = proc_permission,
};
@@ -1780,6 +1821,10 @@ static struct dentry *proc_pident_lookup
case PROC_TGID_OOM_ADJUST:
inode->i_fop = &proc_oom_adjust_operations;
break;
+ case PROC_TID_CTL:
+ case PROC_TGID_CTL:
+ inode->i_fop = &proc_ctl_operations;
+ break;
#ifdef CONFIG_AUDITSYSCALL
case PROC_TID_LOGINUID:
case PROC_TGID_LOGINUID:
-
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