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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566// SPDX-License-Identifier: GPL-2.0#include <linux/cache.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/pid_namespace.h>#include "internal.h"
/* * /proc/thread_self: */static const char *proc_thread_self_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done){ struct pid_namespace *ns = proc_pid_ns(inode->i_sb); pid_t tgid = task_tgid_nr_ns(current, ns); pid_t pid = task_pid_nr_ns(current, ns); char *name;
if (!pid) return ERR_PTR(-ENOENT); name = kmalloc(10 + 6 + 10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC); if (unlikely(!name)) return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD); sprintf(name, "%u/task/%u", tgid, pid); set_delayed_call(done, kfree_link, name); return name;}
static const struct inode_operations proc_thread_self_inode_operations = { .get_link = proc_thread_self_get_link,};
unsigned thread_self_inum __ro_after_init;
int proc_setup_thread_self(struct super_block *s){ struct dentry *thread_self; int ret = -ENOMEM;
thread_self = d_alloc_name(s->s_root, "thread-self"); if (thread_self) { struct inode *inode = new_inode(s); if (inode) { inode->i_ino = thread_self_inum; simple_inode_init_ts(inode); inode->i_mode = S_IFLNK | S_IRWXUGO; inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; inode->i_op = &proc_thread_self_inode_operations; d_make_persistent(thread_self, inode); ret = 0; } dput(thread_self); }
if (ret) pr_err("proc_fill_super: can't allocate /proc/thread-self\n"); return ret;}
void __init proc_thread_self_init(void){ proc_alloc_inum(&thread_self_inum);}