| /****************************************************************************** |
| * |
| * Copyright (c) International Business Machines Corp., 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 |
| * |
| * NAME |
| * swapon03.c |
| * |
| * DESCRIPTION |
| * This test case checks whether swapon(2) system call returns: |
| * - EPERM when there are more than MAX_SWAPFILES already in use. |
| * |
| * Setup: |
| * Setup signal handling. |
| * Pause for SIGUSR1 if option specified. |
| * Create MAX_SWAPFILES - 2 (to support latest kernels) swapfiles |
| * |
| * Test: |
| * Loop if the proper options are given. |
| * Execute system call. |
| * Check return code, if system call fails with errno == expected errno |
| * Issue syscall passed with expected errno |
| * Otherwise, |
| * Issue syscall failed to produce expected errno |
| * |
| * Cleanup: |
| * Do cleanup for the test. |
| * |
| * USAGE: <for command-line> |
| * swapon03 [-e] [-i n] [-I x] [-p x] [-t] [-h] [-f] [-p] |
| * where |
| * -e : Turn on errno logging. |
| * -i n : Execute test n times. |
| * -I x : Execute test for x seconds. |
| * -p : Pause for SIGUSR1 before starting |
| * -P x : Pause for x seconds between iterations. |
| * -t : Turn on syscall timing. |
| * |
| * Author |
| * Ricardo Salveti de Araujo <rsalveti@linux.vnet.ibm.com> based on |
| * swapon02 created by Aniruddha Marathe |
| * |
| * History |
| * 16/08/2007 Created <rsalveti@linux.vnet.ibm.com> |
| * |
| ******************************************************************************/ |
| |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <sys/wait.h> |
| #include <sys/stat.h> |
| #include <sys/utsname.h> |
| #include <fcntl.h> |
| #include <pwd.h> |
| #include <string.h> |
| #include <signal.h> |
| #include "test.h" |
| #include "usctest.h" |
| #include "config.h" |
| #include "linux_syscall_numbers.h" |
| #include "swaponoff.h" |
| #include "libswapon.h" |
| |
| void setup(); |
| void cleanup(); |
| int setup_swap(); |
| int clean_swap(); |
| int check_and_swapoff(char *filename); |
| |
| char *TCID = "swapon03"; |
| int TST_TOTAL = 1; |
| |
| static int exp_enos[] = { EPERM, 0 }; |
| |
| static int swapfiles; /* Number of swapfiles turned on */ |
| |
| struct utsname uval; |
| char *kmachine; |
| |
| /* Paths for files that we'll use to test */ |
| int testfiles = 3; |
| static struct swap_testfile_t { |
| char *filename; |
| } swap_testfiles[] = { |
| { |
| "firstswapfile"}, { |
| "secondswapfile"}, { |
| "thirdswapfile"} |
| }; |
| |
| int expected_errno = EPERM; /* Expected errno when doing the test */ |
| |
| int main(int ac, char **av) |
| { |
| int lc; |
| char *msg; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| /*************************************************************** |
| * perform global setup for test |
| ***************************************************************/ |
| uname(&uval); |
| kmachine = uval.machine; |
| setup(); |
| |
| /*************************************************************** |
| * check looping state if -i option given |
| ***************************************************************/ |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| /* do the test setup */ |
| if (setup_swap() < 0) { |
| clean_swap(); |
| tst_brkm(TBROK, cleanup, |
| "Setup failed, quitting the test"); |
| } |
| |
| /* Call swapon sys call for the first time */ |
| TEST(ltp_syscall(__NR_swapon, swap_testfiles[0].filename, 0)); |
| |
| /* Check return code */ |
| if ((TEST_RETURN == -1) && (TEST_ERRNO == expected_errno)) { |
| tst_resm(TPASS, "swapon(2) got expected failure (%d),", |
| expected_errno); |
| } else if (TEST_RETURN < 0) { |
| tst_resm(TFAIL | TTERRNO, |
| "swapon(2) failed to produce expected error " |
| "(%d). System reboot recommended.", |
| expected_errno); |
| } else { |
| /* Probably the system supports MAX_SWAPFILES > 30, |
| * let's try with MAX_SWAPFILES == 32 */ |
| |
| /* Call swapon sys call once again for 32 |
| * now we can't receive an error */ |
| TEST(ltp_syscall |
| (__NR_swapon, swap_testfiles[1].filename, 0)); |
| |
| /* Check return code (now we're expecting success) */ |
| if (TEST_RETURN < 0) { |
| tst_resm(TFAIL | TTERRNO, |
| "swapon(2) got an unexpected failure"); |
| } else { |
| /* Call swapon sys call once again for 33 |
| * now we have to receive an error */ |
| TEST(ltp_syscall |
| (__NR_swapon, swap_testfiles[2].filename, |
| 0)); |
| |
| /* Check return code (should be an error) */ |
| if ((TEST_RETURN == -1) |
| && (TEST_ERRNO == expected_errno)) { |
| tst_resm(TPASS, |
| "swapon(2) got expected failure;" |
| " Got errno = %d, probably your" |
| " MAX_SWAPFILES is 32", |
| expected_errno); |
| } else { |
| tst_resm(TFAIL, |
| "swapon(2) failed to produce" |
| " expected error: %d, got %s." |
| " System reboot after execution of LTP" |
| " test suite is recommended.", |
| expected_errno, |
| strerror(TEST_ERRNO)); |
| } |
| |
| } |
| } |
| |
| /* do the clean */ |
| if (clean_swap() < 0) |
| tst_brkm(TBROK, cleanup, |
| "Cleanup failed, quitting the test"); |
| |
| TEST_ERROR_LOG(TEST_ERRNO); |
| |
| } |
| |
| cleanup(); |
| tst_exit(); |
| |
| } |
| |
| /*************************************************************** |
| * setup_swap() - Create 33 and activate 30 swapfiles. |
| ***************************************************************/ |
| int setup_swap() |
| { |
| pid_t pid; |
| int j, fd; /*j is loop counter, fd is file descriptor */ |
| int status; /* used for fork */ |
| int res = 0; |
| char filename[15]; /* array to store new filename */ |
| char buf[BUFSIZ + 1]; /* temp buffer for reading /proc/swaps */ |
| |
| /* Find out how many swapfiles (1 line per entry) already exist */ |
| swapfiles = 0; |
| |
| if (seteuid(0) < 0) { |
| tst_brkm(TFAIL | TERRNO, cleanup, "Failed to call seteuid"); |
| } |
| |
| /* This includes the first (header) line */ |
| if ((fd = open("/proc/swaps", O_RDONLY)) == -1) { |
| tst_brkm(TFAIL | TERRNO, cleanup, |
| "Failed to find out existing number of swap files"); |
| } |
| do { |
| char *p = buf; |
| res = read(fd, buf, BUFSIZ); |
| if (res < 0) { |
| tst_brkm(TFAIL | TERRNO, cleanup, |
| "Failed to find out existing number of swap " |
| "files"); |
| } |
| buf[res] = '\0'; |
| while ((p = strchr(p, '\n'))) { |
| p++; |
| swapfiles++; |
| } |
| } while (BUFSIZ <= res); |
| close(fd); |
| if (swapfiles) |
| swapfiles--; /* don't count the /proc/swaps header */ |
| |
| if (swapfiles < 0) { |
| tst_brkm(TFAIL, cleanup, |
| "Failed to find existing number of swapfiles"); |
| } |
| |
| /* Determine how many more files are to be created */ |
| swapfiles = MAX_SWAPFILES - swapfiles; |
| if (swapfiles > MAX_SWAPFILES) { |
| swapfiles = MAX_SWAPFILES; |
| } |
| |
| pid = FORK_OR_VFORK(); |
| if (pid == 0) { |
| /*create and turn on remaining swapfiles */ |
| for (j = 0; j < swapfiles; j++) { |
| |
| /* prepare filename for the iteration */ |
| if (sprintf(filename, "swapfile%02d", j + 2) < 0) { |
| printf("sprintf() failed to create " |
| "filename"); |
| exit(1); |
| } |
| |
| /* Create the swapfile */ |
| make_swapfile(cleanup, filename); |
| |
| /* turn on the swap file */ |
| res = ltp_syscall(__NR_swapon, filename, 0); |
| if (res != 0) { |
| if (errno == EPERM) { |
| printf("Successfully created %d " |
| "swapfiles\n", j); |
| break; |
| } else { |
| printf("Failed to create " |
| "swapfile: %s\n", filename); |
| exit(1); |
| } |
| } |
| } |
| exit(0); |
| } else |
| waitpid(pid, &status, 0); |
| |
| if (WEXITSTATUS(status)) { |
| tst_brkm(TFAIL, cleanup, "Failed to setup swaps"); |
| } |
| |
| /* Create all needed extra swapfiles for testing */ |
| for (j = 0; j < testfiles; j++) |
| make_swapfile(cleanup, swap_testfiles[j].filename); |
| |
| return 0; |
| |
| } |
| |
| /*************************************************************** |
| * clean_swap() - clearing all turned on swapfiles |
| ***************************************************************/ |
| int clean_swap() |
| { |
| int j; |
| char filename[FILENAME_MAX]; |
| |
| for (j = 0; j < swapfiles; j++) { |
| if (snprintf(filename, sizeof(filename), |
| "swapfile%02d", j + 2) < 0) { |
| tst_resm(TWARN, "sprintf() failed to create filename"); |
| tst_resm(TWARN, "Failed to turn off swap files. System" |
| " reboot after execution of LTP test" |
| " suite is recommended"); |
| return -1; |
| } |
| if (check_and_swapoff(filename) != 0) { |
| tst_resm(TWARN, "Failed to turn off swap file %s.", |
| filename); |
| return -1; |
| } |
| } |
| |
| for (j = 0; j < testfiles; j++) { |
| if (check_and_swapoff(swap_testfiles[j].filename) != 0) { |
| tst_resm(TWARN, "Failed to turn off swap file %s.", |
| swap_testfiles[j].filename); |
| return -1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /*************************************************************** |
| * check_and_swapoff() - check if the file is at /proc/swaps and |
| * remove it giving swapoff |
| ***************************************************************/ |
| int check_and_swapoff(char *filename) |
| { |
| char cmd_buffer[256]; |
| int rc = -1; |
| |
| if (snprintf(cmd_buffer, sizeof(cmd_buffer), |
| "grep -q '%s.*file' /proc/swaps", filename) < 0) { |
| tst_resm(TWARN, |
| "sprintf() failed to create the command string"); |
| } else { |
| |
| rc = 0; |
| |
| if (system(cmd_buffer) == 0) { |
| |
| /* now we need to swapoff the file */ |
| if (ltp_syscall(__NR_swapoff, filename) != 0) { |
| |
| tst_resm(TWARN, "Failed to turn off swap " |
| "file. system reboot after " |
| "execution of LTP test suite " |
| "is recommended"); |
| rc = -1; |
| |
| } |
| |
| } |
| } |
| |
| return rc; |
| |
| } |
| |
| /*************************************************************** |
| * setup() - performs all ONE TIME setup for this test |
| ***************************************************************/ |
| void setup() |
| { |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* set the expected errnos... */ |
| TEST_EXP_ENOS(exp_enos); |
| |
| /* Check whether we are root */ |
| if (geteuid() != 0) { |
| tst_brkm(TBROK, NULL, "Test must be run as root"); |
| } |
| |
| tst_tmpdir(); |
| |
| if (tst_is_cwd_tmpfs()) { |
| tst_brkm(TCONF, cleanup, |
| "Cannot do swapon on a file located on a tmpfs filesystem"); |
| } |
| |
| if (tst_is_cwd_nfs()) { |
| tst_brkm(TCONF, cleanup, |
| "Cannot do swapon on a file located on a nfs filesystem"); |
| } |
| |
| TEST_PAUSE; |
| |
| } |
| |
| /*************************************************************** |
| * cleanup() - performs all ONE TIME cleanup for this test at |
| * completion or premature exit. |
| ***************************************************************/ |
| void cleanup() |
| { |
| /* |
| * print timing stats if that option was specified. |
| * print errno log if that option was specified. |
| */ |
| TEST_CLEANUP; |
| |
| /* Remove any remaining swap files */ |
| clean_swap(); |
| |
| tst_rmdir(); |
| |
| } |