tools/perf/util/namespaces.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *
   4  * Copyright (C) 2017 Hari Bathini, IBM Corporation
   5  */
   6
   7 #ifndef __PERF_NAMESPACES_H
   8 #define __PERF_NAMESPACES_H
   9
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <linux/stddef.h>
  13 #include <linux/perf_event.h>
  14 #include <linux/refcount.h>
  15 #include <linux/types.h>
  16 #include <internal/rc_check.h>
  17
  18 #ifndef HAVE_SETNS_SUPPORT
  19 int setns(int fd, int nstype);
  20 #endif
  21
  22 struct perf_record_namespaces;
  23
  24 struct namespaces {
  25         struct list_head list;
  26         u64 end_time;
  27         struct perf_ns_link_info link_info[];
  28 };
  29
  30 struct namespaces *namespaces__new(struct perf_record_namespaces *event);
  31 void namespaces__free(struct namespaces *namespaces);
  32
  33 DECLARE_RC_STRUCT(nsinfo) {
  34         pid_t                   pid;
  35         pid_t                   tgid;
  36         pid_t                   nstgid;
  37         bool                    need_setns;
  38         bool                    in_pidns;
  39         char                    *mntns_path;
  40         refcount_t              refcnt;
  41 };
  42
  43 struct nscookie {
  44         int                     oldns;
  45         int                     newns;
  46         char                    *oldcwd;
  47 };
  48
  49 int nsinfo__init(struct nsinfo *nsi);
  50 struct nsinfo *nsinfo__new(pid_t pid);
  51 struct nsinfo *nsinfo__copy(const struct nsinfo *nsi);
  52
  53 struct nsinfo *nsinfo__get(struct nsinfo *nsi);
  54 void nsinfo__put(struct nsinfo *nsi);
  55
  56 bool nsinfo__need_setns(const struct nsinfo *nsi);
  57 void nsinfo__clear_need_setns(struct nsinfo *nsi);
  58 pid_t nsinfo__tgid(const struct nsinfo  *nsi);
  59 pid_t nsinfo__nstgid(const struct nsinfo  *nsi);
  60 pid_t nsinfo__pid(const struct nsinfo  *nsi);
  61 pid_t nsinfo__in_pidns(const struct nsinfo  *nsi);
  62
  63 void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
  64 void nsinfo__mountns_exit(struct nscookie *nc);
  65
  66 char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
  67 int nsinfo__stat(const char *filename, struct stat *st, struct nsinfo *nsi);
  68
  69 bool nsinfo__is_in_root_namespace(void);
  70
  71 static inline void __nsinfo__zput(struct nsinfo **nsip)
  72 {
  73         if (nsip) {
  74                 nsinfo__put(*nsip);
  75                 *nsip = NULL;
  76         }
  77 }
  78
  79 #define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
  80
  81 const char *perf_ns__name(unsigned int id);
  82
  83 #endif  /* __PERF_NAMESPACES_H */