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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) */
#include <linux/ctype.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/types.h>#include <linux/uaccess.h>
/* * If read and write race, the read will still atomically read a valid * value. */int uml_exitcode = 0;
static int exitcode_proc_show(struct seq_file *m, void *v){ int val;
/* * Save uml_exitcode in a local so that we don't need to guarantee * that sprintf accesses it atomically. */ val = uml_exitcode; seq_printf(m, "%d\n", val); return 0;}
static int exitcode_proc_open(struct inode *inode, struct file *file){ return single_open(file, exitcode_proc_show, NULL);}
static ssize_t exitcode_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos){ char *end, buf[sizeof("nnnnn\0")]; size_t size; int tmp;
size = min(count, sizeof(buf)); if (copy_from_user(buf, buffer, size)) return -EFAULT;
tmp = simple_strtol(buf, &end, 0); if ((*end != '\0') && !isspace(*end)) return -EINVAL;
uml_exitcode = tmp; return count;}
static const struct proc_ops exitcode_proc_ops = { .proc_open = exitcode_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = exitcode_proc_write,};
static int make_proc_exitcode(void){ struct proc_dir_entry *ent;
ent = proc_create("exitcode", 0600, NULL, &exitcode_proc_ops); if (ent == NULL) { printk(KERN_WARNING "make_proc_exitcode : Failed to register " "/proc/exitcode\n"); return 0; } return 0;}
__initcall(make_proc_exitcode);