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/* Systemtap test case
* Copyright (C) 2010, Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sched.h>
#include <errno.h>
#include "dtrace_clone_probes.h"
#if !defined(CLONE_NEWPID)
#define CLONE_NEWPID 0
#endif
#define CLONE_FLAGS (CLONE_NEWPID|CLONE_FILES|CLONE_FS|CLONE_VM|SIGCHLD)
#if !defined(USE_SEMAPHORES)
#undef TEST_CHILD2_ENABLED
#define TEST_CHILD2_ENABLED() (1)
#undef TEST_CHILD1_ENABLED
#define TEST_CHILD1_ENABLED() (1)
#undef TEST_CHILD2_PID_ENABLED
#define TEST_CHILD2_PID_ENABLED() (1)
#undef TEST_MAIN_ENABLED
#define TEST_MAIN_ENABLED() (1)
#undef TEST_CHILD1_PID_ENABLED
#define TEST_CHILD1_PID_ENABLED() (1)
#undef TEST_MAIN2_ENABLED
#define TEST_MAIN2_ENABLED() (1)
#endif
void *stack_base2 = NULL;
void *stack_top2 = NULL;
static int uprobes_ns_child2(void *argv __attribute__((__unused__)))
{
if (TEST_CHILD2_ENABLED()) {
TEST_CHILD2(getpid());
}
_exit(0);
}
static int uprobes_ns_child1(void *argv __attribute__((__unused__)))
{
int pid;
int rc = 0;
/* Create the second clone. */
if (TEST_CHILD1_ENABLED()) {
TEST_CHILD1(getpid());
}
pid = clone(uprobes_ns_child2, stack_top2, CLONE_FLAGS, NULL);
if (TEST_CHILD2_PID_ENABLED()) {
TEST_CHILD2_PID(pid);
}
if (pid < 0) {
/* Error. */
char *msg2 = "clone 2 failed\n";
write(2, msg2, strlen(msg2));
rc = errno;
}
else {
int status;
waitpid(pid, &status, 0);
rc = WEXITSTATUS(status);
}
_exit(rc);
}
int
main(int argc, char **argv)
{
long pagesize = sysconf(_SC_PAGESIZE);
void *stack_base1, *stack_top1;
int pid;
int rc = 0;
/* Allocate both stacks here. */
stack_base1 = calloc(pagesize * 4, 1);
if (stack_base1 == NULL) {
perror("calloc 1 failed:");
return -1;
}
stack_base2 = calloc(pagesize * 4, 1);
if (stack_base2 == NULL) {
perror("calloc 2 failed:");
return -1;
}
/*
* Get top of stacks. According to the clone() manpage:
* Stacks grow downwards on all processors that run Linux
* (except the HP PA processors), so child_stack usually points
* to the topmost address of the memory space set up for the
* child stack.
*/
stack_top1 = stack_base1 + (pagesize * 4);
stack_top2 = stack_base2 + (pagesize * 4);
/* Create the first clone (which will create the 2nd). */
if (TEST_MAIN_ENABLED()) {
TEST_MAIN(getpid());
}
pid = clone(uprobes_ns_child1, stack_top1, CLONE_FLAGS, NULL);
if (TEST_CHILD1_PID_ENABLED()) {
TEST_CHILD1_PID(pid);
}
if (pid < 0) {
/* error */
perror("clone 1 failed:");
rc = -1;
}
else {
int status;
/* Wait on the first clone to finish. */
waitpid(pid, &status, 0);
rc = WEXITSTATUS(status);
}
/* Cleanup */
free(stack_base1);
free(stack_base2);
if (TEST_MAIN2_ENABLED()) {
TEST_MAIN2();
}
return rc;
}
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