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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
#define _GNU_SOURCE
#include <test_progs.h>
#include "test_ns_current_pid_tgid.skel.h"
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sched.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/fcntl.h>
#define STACK_SIZE (1024 * 1024)
static char child_stack[STACK_SIZE];
static int test_current_pid_tgid(void *args)
{
struct test_ns_current_pid_tgid__bss *bss;
struct test_ns_current_pid_tgid *skel;
int err = -1, duration = 0;
pid_t tgid, pid;
struct stat st;
skel = test_ns_current_pid_tgid__open_and_load();
if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
goto cleanup;
pid = syscall(SYS_gettid);
tgid = getpid();
err = stat("/proc/self/ns/pid", &st);
if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err))
goto cleanup;
bss = skel->bss;
bss->dev = st.st_dev;
bss->ino = st.st_ino;
bss->user_pid = 0;
bss->user_tgid = 0;
err = test_ns_current_pid_tgid__attach(skel);
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
goto cleanup;
/* trigger tracepoint */
usleep(1);
ASSERT_EQ(bss->user_pid, pid, "pid");
ASSERT_EQ(bss->user_tgid, tgid, "tgid");
err = 0;
cleanup:
test_ns_current_pid_tgid__destroy(skel);
return err;
}
static void test_ns_current_pid_tgid_new_ns(void)
{
int wstatus, duration = 0;
pid_t cpid;
/* Create a process in a new namespace, this process
* will be the init process of this new namespace hence will be pid 1.
*/
cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE,
CLONE_NEWPID | SIGCHLD, NULL);
if (CHECK(cpid == -1, "clone", "%s\n", strerror(errno)))
return;
if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", "%s\n", strerror(errno)))
return;
if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed"))
return;
}
void test_ns_current_pid_tgid(void)
{
if (test__start_subtest("ns_current_pid_tgid_root_ns"))
test_current_pid_tgid(NULL);
if (test__start_subtest("ns_current_pid_tgid_new_ns"))
test_ns_current_pid_tgid_new_ns();
}
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