tools/perf/util/namespaces.h

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * Copyright (C) 2017 Hari Bathini, IBM Corporation
   7  */
   8
   9 #ifndef __PERF_NAMESPACES_H
  10 #define __PERF_NAMESPACES_H
  11
  12 #include <sys/types.h>
  13 #include <linux/stddef.h>
  14 #include <linux/perf_event.h>
  15 #include <linux/refcount.h>
  16 #include <linux/types.h>
  17
  18 struct namespaces_event;
  19
  20 struct namespaces {
  21         struct list_head list;
  22         u64 end_time;
  23         struct perf_ns_link_info link_info[];
  24 };
  25
  26 struct namespaces *namespaces__new(struct namespaces_event *event);
  27 void namespaces__free(struct namespaces *namespaces);
  28
  29 struct nsinfo {
  30         pid_t                   pid;
  31         pid_t                   tgid;
  32         pid_t                   nstgid;
  33         bool                    need_setns;
  34         char                    *mntns_path;
  35         refcount_t              refcnt;
  36 };
  37
  38 struct nscookie {
  39         int                     oldns;
  40         int                     newns;
  41         char                    *oldcwd;
  42 };
  43
  44 int nsinfo__init(struct nsinfo *nsi);
  45 struct nsinfo *nsinfo__new(pid_t pid);
  46 struct nsinfo *nsinfo__copy(struct nsinfo *nsi);
  47 void nsinfo__delete(struct nsinfo *nsi);
  48
  49 struct nsinfo *nsinfo__get(struct nsinfo *nsi);
  50 void nsinfo__put(struct nsinfo *nsi);
  51
  52 void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
  53 void nsinfo__mountns_exit(struct nscookie *nc);
  54
  55 char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
  56
  57 static inline void __nsinfo__zput(struct nsinfo **nsip)
  58 {
  59         if (nsip) {
  60                 nsinfo__put(*nsip);
  61                 *nsip = NULL;
  62         }
  63 }
  64
  65 #define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
  66
  67 #endif  /* __PERF_NAMESPACES_H */