linux/arch/um/kernel/exitcode.c
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   1/*
   2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#include <linux/ctype.h>
   7#include <linux/init.h>
   8#include <linux/kernel.h>
   9#include <linux/module.h>
  10#include <linux/proc_fs.h>
  11#include <linux/seq_file.h>
  12#include <linux/types.h>
  13#include <asm/uaccess.h>
  14
  15/*
  16 * If read and write race, the read will still atomically read a valid
  17 * value.
  18 */
  19int uml_exitcode = 0;
  20
  21static int exitcode_proc_show(struct seq_file *m, void *v)
  22{
  23        int val;
  24
  25        /*
  26         * Save uml_exitcode in a local so that we don't need to guarantee
  27         * that sprintf accesses it atomically.
  28         */
  29        val = uml_exitcode;
  30        seq_printf(m, "%d\n", val);
  31        return 0;
  32}
  33
  34static int exitcode_proc_open(struct inode *inode, struct file *file)
  35{
  36        return single_open(file, exitcode_proc_show, NULL);
  37}
  38
  39static ssize_t exitcode_proc_write(struct file *file,
  40                const char __user *buffer, size_t count, loff_t *pos)
  41{
  42        char *end, buf[sizeof("nnnnn\0")];
  43        int tmp;
  44
  45        if (copy_from_user(buf, buffer, count))
  46                return -EFAULT;
  47
  48        tmp = simple_strtol(buf, &end, 0);
  49        if ((*end != '\0') && !isspace(*end))
  50                return -EINVAL;
  51
  52        uml_exitcode = tmp;
  53        return count;
  54}
  55
  56static const struct file_operations exitcode_proc_fops = {
  57        .owner          = THIS_MODULE,
  58        .open           = exitcode_proc_open,
  59        .read           = seq_read,
  60        .llseek         = seq_lseek,
  61        .release        = single_release,
  62        .write          = exitcode_proc_write,
  63};
  64
  65static int make_proc_exitcode(void)
  66{
  67        struct proc_dir_entry *ent;
  68
  69        ent = proc_create("exitcode", 0600, NULL, &exitcode_proc_fops);
  70        if (ent == NULL) {
  71                printk(KERN_WARNING "make_proc_exitcode : Failed to register "
  72                       "/proc/exitcode\n");
  73                return 0;
  74        }
  75        return 0;
  76}
  77
  78__initcall(make_proc_exitcode);
  79
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