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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* Copyright (C) 2017 Hari Bathini, IBM Corporation
*/
#include "namespaces.h"
#include "util.h"
#include "event.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sched.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
struct namespaces *namespaces__new(struct namespaces_event *event)
{
struct namespaces *namespaces;
u64 link_info_size = ((event ? event->nr_namespaces : NR_NAMESPACES) *
sizeof(struct perf_ns_link_info));
namespaces = zalloc(sizeof(struct namespaces) + link_info_size);
if (!namespaces)
return NULL;
namespaces->end_time = -1;
if (event)
memcpy(namespaces->link_info, event->link_info, link_info_size);
return namespaces;
}
void namespaces__free(struct namespaces *namespaces)
{
free(namespaces);
}
void nsinfo__init(struct nsinfo *nsi)
{
char oldns[PATH_MAX];
char *newns = NULL;
struct stat old_stat;
struct stat new_stat;
if (snprintf(oldns, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
return;
if (asprintf(&newns, "/proc/%d/ns/mnt", nsi->pid) == -1)
return;
if (stat(oldns, &old_stat) < 0)
goto out;
if (stat(newns, &new_stat) < 0)
goto out;
/* Check if the mount namespaces differ, if so then indicate that we
* want to switch as part of looking up dso/map data.
*/
if (old_stat.st_ino != new_stat.st_ino) {
nsi->need_setns = true;
nsi->mntns_path = newns;
newns = NULL;
}
out:
free(newns);
}
struct nsinfo *nsinfo__new(pid_t pid)
{
struct nsinfo *nsi = calloc(1, sizeof(*nsi));
if (nsi != NULL) {
nsi->pid = pid;
nsi->need_setns = false;
nsinfo__init(nsi);
refcount_set(&nsi->refcnt, 1);
}
return nsi;
}
void nsinfo__delete(struct nsinfo *nsi)
{
zfree(&nsi->mntns_path);
free(nsi);
}
struct nsinfo *nsinfo__get(struct nsinfo *nsi)
{
if (nsi)
refcount_inc(&nsi->refcnt);
return nsi;
}
void nsinfo__put(struct nsinfo *nsi)
{
if (nsi && refcount_dec_and_test(&nsi->refcnt))
nsinfo__delete(nsi);
}
void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc)
{
char curpath[PATH_MAX];
int oldns = -1;
int newns = -1;
if (nc == NULL)
return;
nc->oldns = -1;
nc->newns = -1;
if (!nsi || !nsi->need_setns)
return;
if (snprintf(curpath, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
return;
oldns = open(curpath, O_RDONLY);
if (oldns < 0)
return;
newns = open(nsi->mntns_path, O_RDONLY);
if (newns < 0)
goto errout;
if (setns(newns, CLONE_NEWNS) < 0)
goto errout;
nc->oldns = oldns;
nc->newns = newns;
return;
errout:
if (oldns > -1)
close(oldns);
if (newns > -1)
close(newns);
}
void nsinfo__mountns_exit(struct nscookie *nc)
{
if (nc == NULL || nc->oldns == -1 || nc->newns == -1)
return;
setns(nc->oldns, CLONE_NEWNS);
if (nc->oldns > -1) {
close(nc->oldns);
nc->oldns = -1;
}
if (nc->newns > -1) {
close(nc->newns);
nc->newns = -1;
}
}
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