LXR linux/include/linux/pid

   1#ifndef _LINUX_PID_NS_H
   2#define _LINUX_PID_NS_H
   3
   4#include <linux/sched.h>
   5#include <linux/mm.h>
   6#include <linux/threads.h>
   7#include <linux/nsproxy.h>
   8#include <linux/kref.h>
   9
  10struct pidmap {
  11       atomic_t nr_free;
  12       void *page;
  13};
  14
  15#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
  16
  17struct bsd_acct_struct;
  18
  19struct pid_namespace {
  20        struct kref kref;
  21        struct pidmap pidmap[PIDMAP_ENTRIES];
  22        int last_pid;
  23        struct task_struct *child_reaper;
  24        struct kmem_cache *pid_cachep;
  25        unsigned int level;
  26        struct pid_namespace *parent;
  27#ifdef CONFIG_PROC_FS
  28        struct vfsmount *proc_mnt;
  29#endif
  30#ifdef CONFIG_BSD_PROCESS_ACCT
  31        struct bsd_acct_struct *bacct;
  32#endif
  33};
  34
  35extern struct pid_namespace init_pid_ns;
  36
  37#ifdef CONFIG_PID_NS
  38static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  39{
  40        if (ns != &init_pid_ns)
  41                kref_get(&ns->kref);
  42        return ns;
  43}
  44
  45extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
  46extern void free_pid_ns(struct kref *kref);
  47extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
  48
  49static inline void put_pid_ns(struct pid_namespace *ns)
  50{
  51        if (ns != &init_pid_ns)
  52                kref_put(&ns->kref, free_pid_ns);
  53}
  54
  55#else /* !CONFIG_PID_NS */
  56#include <linux/err.h>
  57
  58static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  59{
  60        return ns;
  61}
  62
  63static inline struct pid_namespace *
  64copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
  65{
  66        if (flags & CLONE_NEWPID)
  67                ns = ERR_PTR(-EINVAL);
  68        return ns;
  69}
  70
  71static inline void put_pid_ns(struct pid_namespace *ns)
  72{
  73}
  74
  75
  76static inline void zap_pid_ns_processes(struct pid_namespace *ns)
  77{
  78        BUG();
  79}
  80#endif /* CONFIG_PID_NS */
  81
  82extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
  83void pidhash_init(void);
  84void pidmap_init(void);
  85
  86#endif /* _LINUX_PID_NS_H */
  87