| /******************************************************************************/ |
| /* 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: bdflush01.c */ |
| /* */ |
| /* Description: bdflush() starts, flushes, or tunes the buffer-dirty-flush */ |
| /* daemon. Only a privileged process (one with the CAP_SYS_ADMIN */ |
| /* capability) may call bdflush(). */ |
| /* */ |
| /* If func is negative or 0, and no daemon has been started, */ |
| /* then bdflush() enters the daemon code and never returns. */ |
| /* */ |
| /* If func is 1, some dirty buffers are written to disk. */ |
| /* If func is 2 or more and is even (low bit is 0), then address */ |
| /* is the address of a long word, and the tuning parameter */ |
| /* numbered (func-2)/2 is returned to the caller in that address.*/ |
| /* */ |
| /* If func is 3 or more and is odd (low bit is 1), then data is */ |
| /* a long word, and the kernel sets tuning parameter numbered */ |
| /* (func-3)/2 to that value. */ |
| /* */ |
| /* The set of parameters, their values, and their legal ranges */ |
| /* are defined in the kernel source file fs/buffer.c. */ |
| /* */ |
| /* Return Value: */ |
| /* If func is negative or 0 and the daemon successfully starts, */ |
| /* bdflush() never returns. Otherwise, the return value is 0 on */ |
| /* success and -1 on failure, with errno set to indicate the */ |
| /* error. */ |
| /* */ |
| /* Errors: */ |
| /* EBUSY */ |
| /* An attempt was made to enter the daemon code after*/ |
| /* another process has already entered. */ |
| /* EFAULT */ |
| /* address points outside your accessible address */ |
| /* space. */ |
| /* EINVAL */ |
| /* An attempt was made to read or write an invalid */ |
| /* parameter number, or to write an invalid value to */ |
| /* a parameter. */ |
| /* EPERM */ |
| /* Caller does not have the CAP_SYS_ADMIN capability.*/ |
| /* */ |
| /* Usage: <for command-line> */ |
| /* bdflush01 [-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: bdflush01 */ |
| /* History: Porting from Crackerjack to LTP is done by */ |
| /* Manas Kumar Nayak maknayak@in.ibm.com> */ |
| /******************************************************************************/ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/wait.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <sys/stat.h> |
| #include <sys/kdaemon.h> |
| |
| #include "test.h" |
| #include "linux_syscall_numbers.h" |
| |
| char *TCID = "bdflush01"; |
| int testno; |
| int TST_TOTAL = 1; |
| |
| void cleanup(void) |
| { |
| tst_rmdir(); |
| } |
| |
| void setup(void) |
| { |
| TEST_PAUSE; |
| tst_tmpdir(); |
| } |
| |
| int main(int ac, char **av) |
| { |
| long data; |
| const char *msg; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| /* |
| * TODO (garrcoop): add more functional testcases; there are a ton |
| * missing. |
| */ |
| data = 0; |
| tst_count = 1; |
| for (testno = 0; testno < TST_TOTAL; ++testno) { |
| TEST(ltp_syscall(__NR_bdflush, 3, data)); |
| if (TEST_RETURN == -1) |
| tst_brkm(TFAIL | TTERRNO, cleanup, "bdflush failed"); |
| else |
| tst_resm(TPASS, "bdflush() = %ld", TEST_RETURN); |
| } |
| cleanup(); |
| tst_exit(); |
| } |