| /*************************************************************************/ |
| /* 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 "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) |
| { |
| /* Capture signals if any */ |
| /* Create temporary directories */ |
| TEST_PAUSE; |
| tst_tmpdir(); |
| } |
| |
| int main(int ac, char **av) |
| { |
| pid_t pid1; |
| int lc; |
| int rval; |
| const char *msg; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| 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 { |
| if (wait(&rval) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, |
| "wait failed"); |
| 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 { |
| if (wait(&rval) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, |
| "wait failed"); |
| 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 { |
| if (wait(&rval) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, |
| "wait failed"); |
| 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 |