text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Handling of different ABIs (personalities).
   *
   * We group personalities into execution domains which have their
   * own handlers for kernel entry points, signal mapping, etc...
   *
   * 2001-05-06	Complete rewrite,  Christoph Hellwig (hch@infradead.org)
   */
  
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/kmod.h>
  #include <linux/module.h>
  #include <linux/personality.h>
  #include <linux/proc_fs.h>
  #include <linux/sched.h>
  #include <linux/seq_file.h>
  #include <linux/syscalls.h>
  #include <linux/sysctl.h>
  #include <linux/types.h>
  #include <linux/fs_struct.h>
  
  #ifdef CONFIG_PROC_FS
  static int execdomains_proc_show(struct seq_file *m, void *v)
  {
  	seq_puts(m, "0-0\tLinux           \t[kernel]\n");
  	return 0;
  }
  
  static int execdomains_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, execdomains_proc_show, NULL);
  }
  
  static const struct file_operations execdomains_proc_fops = {
  	.open		= execdomains_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  static int __init proc_execdomains_init(void)
  {
  	proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
  	return 0;
  }
  module_init(proc_execdomains_init);
  #endif
  
  SYSCALL_DEFINE1(personality, unsigned int, personality)
  {
  	unsigned int old = current->personality;
  
  	if (personality != 0xffffffff)
  		set_personality(personality);
  
  	return old;
  }
  