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 <linux/stddef.h>
  12 #include <linux/perf_event.h>
  13 #include <linux/refcount.h>
  14 #include <linux/types.h>
  15
  16 #ifndef HAVE_SETNS_SUPPORT
  17 int setns(int fd, int nstype);
  18 #endif
  19
  20 struct perf_record_namespaces;
  21
  22 struct namespaces {
  23         struct list_head list;
  24         u64 end_time;
  25         struct perf_ns_link_info link_info[];
  26 };
  27
  28 struct namespaces *namespaces__new(struct perf_record_namespaces *event);
  29 void namespaces__free(struct namespaces *namespaces);
  30
  31 struct nsinfo {
  32         pid_t                   pid;
  33         pid_t                   tgid;
  34         pid_t                   nstgid;
  35         bool                    need_setns;
  36         char                    *mntns_path;
  37         refcount_t              refcnt;
  38 };
  39
  40 struct nscookie {
  41         int                     oldns;
  42         int                     newns;
  43         char                    *oldcwd;
  44 };
  45
  46 int nsinfo__init(struct nsinfo *nsi);
  47 struct nsinfo *nsinfo__new(pid_t pid);
  48 struct nsinfo *nsinfo__copy(struct nsinfo *nsi);
  49 void nsinfo__delete(struct nsinfo *nsi);
  50
  51 struct nsinfo *nsinfo__get(struct nsinfo *nsi);
  52 void nsinfo__put(struct nsinfo *nsi);
  53
  54 void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
  55 void nsinfo__mountns_exit(struct nscookie *nc);
  56
  57 char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
  58
  59 static inline void __nsinfo__zput(struct nsinfo **nsip)
  60 {
  61         if (nsip) {
  62                 nsinfo__put(*nsip);
  63                 *nsip = NULL;
  64         }
  65 }
  66
  67 #define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
  68
  69 const char *perf_ns__name(unsigned int id);
  70
  71 #endif  /* __PERF_NAMESPACES_H */