/*************************************************************************/
/* Copyright (c) Crackerjack Project., 2007 */
/* */
/* This program is free software; you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation; either version 2 of the License, or */
/* (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
/* the GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA*/
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* File: unshare01.c */
/* */
/* Description: This tests the unshare() syscall. */
/* unshare() allows a process to disassociate parts of its */
/* execution context that are currently being shared with other */
/* processes. Part of the execution context, such as the namespace */
/* ,is shared implicitly when a new process is created using */
/* fork(2) or vfork(2), while other parts, such as virtual memory */
/* , may be shared by explicit request when creating a process */
/* using clone(2). */
/* */
/* The main use of unshare() is to allow a process to control its */
/* shared execution context without creating a new process. */
/* */
/* */
/* The flags argument is a bit mask that specifies which parts of */
/* the execution context should be unshared. This argument is */
/* specified by ORing together zero or more of the following cons- */
/* tants: */
/* */
/* CLONE_FILES: */
/* Reverse the effect of the clone(2) CLONE_FILES flag. */
/* Unshare the file descriptor table, so that the calling */
/* process no longer shares its file descriptors with any */
/* other process. */
/* CLONE_FS: */
/* Reverse the effect of the clone(2) CLONE_FS flag.Unshare*/
/* file system attributes, so that the calling process no */
/* longer shares its root directory, current directory, or */
/* umask attributes with any other process. */
/* CLONE_NEWNS: */
/* This flag has the same effect as the clone(2) CLONE_NEWNS*/
/* flag. Unshare the namespace, so that the calling process*/
/* has a private copy of its namespacei which is not shared*/
/* with any other process. Specifying this flag automat- */
/* ically implies CLONE_FS as well. */
/* */
/* If flags is specified as zero, then unshare() is a no-op; no */
/* changes are made to the calling process's execution context. */
/* */
/* Usage: <for command-line> */
/* unshare01 [-c n] [-e][-i n] [-I x] [-p x] [-t] */
/* where, -c n : Run n copies concurrently. */
/* -e : Turn on errno logging. */
/* -i n : Execute test n times. */
/* -I x : Execute test for x seconds. */
/* -P x : Pause for x seconds between iterations. */
/* -t : Turn on syscall timing. */
/* */
/* Total Tests: 1 */
/* */
/* Test Name: unshare01 */
/* History: Porting from Crackerjack to LTP is done by */
/* Manas Kumar Nayak maknayak@in.ibm.com> */
/********************************************************************************/
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sched.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <sys/param.h>
#include <stdio.h>
#include "test.h"
#include "safe_macros.h"
#include "config.h"
char *TCID = "unshare01";
int testno;
int TST_TOTAL = 1;
#ifdef HAVE_UNSHARE
/* Extern Global Functions */
/******************************************************************************/
/* */
/* Function: cleanup */
/* */
/* Description: Performs all one time clean up for this test on successful */
/* completion, premature exit or failure. Closes all temporary */
/* files, removes all temporary directories exits the test with */
/* appropriate return code by calling tst_exit() function. */
/* */
/* Input: None. */
/* */
/* Output: None. */
/* */
/* Return: On failure - Exits calling tst_exit(). Non '0' return code. */
/* On success - Exits calling tst_exit(). With '0' return code. */
/* */
/******************************************************************************/
void cleanup(void)
{
tst_rmdir();
}
/* Local Functions */
/******************************************************************************/
/* */
/* Function: setup */
/* */
/* Description: Performs all one time setup for this test. This function is */
/* typically used to capture signals, create temporary dirs */
/* and temporary files that may be used in the course of this */
/* test. */
/* */
/* Input: None. */
/* */
/* Output: None. */
/* */
/* Return: On failure - Exits by calling cleanup(). */
/* On success - returns 0. */
/* */
/******************************************************************************/
void setup(void)
{
tst_require_root();
/* Capture signals if any */
/* Create temporary directories */
TEST_PAUSE;
tst_tmpdir();
}
int main(int ac, char **av)
{
pid_t pid1;
int lc;
int rval;
tst_parse_opts(ac, av, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); ++lc) {
tst_count = 0;
for (testno = 0; testno < TST_TOTAL; ++testno) {
pid1 = fork(); //call to fork()
if (pid1 == -1) {
tst_brkm(TFAIL | TERRNO, cleanup,
"fork failed");
} else if (pid1 == 0) {
switch (unshare(CLONE_FILES)) {
case 0:
printf("unshare with CLONE_FILES call "
"succeeded\n");
rval = 0;
break;
case -1:
if (errno == ENOSYS)
rval = 1;
else {
perror("unshare failed");
rval = 2;
}
}
exit(rval);
} else {
SAFE_WAIT(cleanup, &rval);
if (rval != 0 && WIFEXITED(rval)) {
switch (WEXITSTATUS(rval)) {
case 1:
tst_brkm(TCONF, cleanup,
"unshare not supported in "
"kernel");
break;
default:
tst_brkm(TFAIL, cleanup,
"unshare failed");
}
}
}
pid1 = fork();
if (pid1 == -1) {
tst_brkm(TFAIL | TERRNO, cleanup,
"fork failed");
} else if (pid1 == 0) {
switch (unshare(CLONE_FS)) {
case 0:
printf("unshare with CLONE_FS call "
"succeeded\n");
rval = 0;
break;
case -1:
if (errno == ENOSYS)
rval = 1;
else {
perror("unshare failed");
rval = 2;
}
}
exit(rval);
} else {
SAFE_WAIT(cleanup, &rval);
if (rval != 0 && WIFEXITED(rval)) {
switch (WEXITSTATUS(rval)) {
case 1:
tst_brkm(TCONF, cleanup,
"unshare not supported in "
"kernel");
break;
default:
tst_brkm(TFAIL, cleanup,
"unshare failed");
}
}
}
pid1 = fork();
if (pid1 == -1) {
tst_brkm(TFAIL | TERRNO, cleanup,
"fork() failed.");
} else if (pid1 == 0) {
switch (unshare(CLONE_NEWNS)) {
case 0:
printf("unshare call with CLONE_NEWNS "
"succeeded\n");
rval = 0;
break;
case -1:
if (errno == ENOSYS)
rval = 1;
else {
perror("unshare failed");
rval = 2;
}
}
exit(rval);
} else {
SAFE_WAIT(cleanup, &rval);
if (rval != 0 && WIFEXITED(rval)) {
switch (WEXITSTATUS(rval)) {
case 1:
tst_brkm(TCONF, cleanup,
"unshare not supported in "
"kernel");
break;
default:
tst_brkm(TFAIL, cleanup,
"unshare failed");
}
}
}
}
}
cleanup();
tst_exit();
}
#else
int main(void)
{
tst_brkm(TCONF, NULL, "unshare is undefined.");
}
#endif