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/perf_event.h>
  14 #include <linux/refcount.h>
  15 #include <linux/types.h>
  16
  17 struct namespaces_event;
  18
  19 struct namespaces {
  20         struct list_head list;
  21         u64 end_time;
  22         struct perf_ns_link_info link_info[];
  23 };
  24
  25 struct namespaces *namespaces__new(struct namespaces_event *event);
  26 void namespaces__free(struct namespaces *namespaces);
  27
  28 struct nsinfo {
  29         pid_t                   pid;
  30         pid_t                   tgid;
  31         pid_t                   nstgid;
  32         bool                    need_setns;
  33         char                    *mntns_path;
  34         refcount_t              refcnt;
  35 };
  36
  37 struct nscookie {
  38         int                     oldns;
  39         int                     newns;
  40 };
  41
  42 int nsinfo__init(struct nsinfo *nsi);
  43 struct nsinfo *nsinfo__new(pid_t pid);
  44 struct nsinfo *nsinfo__copy(struct nsinfo *nsi);
  45 void nsinfo__delete(struct nsinfo *nsi);
  46
  47 struct nsinfo *nsinfo__get(struct nsinfo *nsi);
  48 void nsinfo__put(struct nsinfo *nsi);
  49
  50 void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
  51 void nsinfo__mountns_exit(struct nscookie *nc);
  52
  53 char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
  54
  55 static inline void __nsinfo__zput(struct nsinfo **nsip)
  56 {
  57         if (nsip) {
  58                 nsinfo__put(*nsip);
  59                 *nsip = NULL;
  60         }
  61 }
  62
  63 #define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
  64
  65 #endif  /* __PERF_NAMESPACES_H */