"Fossies" - the Fresh Open Source Software Archive

Member "stress-ng-0.09.56/test/test-msync.c" (15 Mar 2019, 1979 Bytes) of package /linux/privat/stress-ng-0.09.56.tar.xz:


As a special service "Fossies" has tried to format the requested source page into HTML format using (guessed) C and C++ source code syntax highlighting (style: standard) with prefixed line numbers and code folding option. Alternatively you can here view or download the uninterpreted source code file. See also the last Fossies "Diffs" side-by-side code changes report for "test-msync.c": 0.09.49_vs_0.09.50.

    1 /*
    2  * Copyright (C) 2013-2019 Canonical, Ltd.
    3  *
    4  * This program is free software; you can redistribute it and/or
    5  * modify it under the terms of the GNU General Public License
    6  * as published by the Free Software Foundation; either version 2
    7  * of the License, or (at your option) any later version.
    8  *
    9  * This program is distributed in the hope that it will be useful,
   10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12  * GNU General Public License for more details.
   13  *
   14  * You should have received a copy of the GNU General Public License
   15  * along with this program; if not, write to the Free Software
   16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   17  *
   18  * This code is a complete clean re-write of the stress tool by
   19  * Colin Ian King <colin.king@canonical.com> and attempts to be
   20  * backwardly compatible with the stress tool by Amos Waterland
   21  * <apw@rossby.metr.ou.edu> but has more stress tests and more
   22  * functionality.
   23  *
   24  */
   25 
   26 #include <string.h>
   27 #include <unistd.h>
   28 #include <sys/types.h>
   29 #include <sys/stat.h>
   30 #include <fcntl.h>
   31 #include <sys/mman.h>
   32 
   33 #if defined(__gnu_hurd__)
   34 #error msync is defined but not implemented and will always fail
   35 #endif
   36 
   37 int main(void)
   38 {
   39     char buffer[8192];
   40     static const char *filename = "/tmp/test-msync.tmp";
   41     int fd, ret, err = 1;
   42     void *ptr;
   43     ssize_t rc;
   44     const size_t sz = sizeof buffer;
   45 
   46     (void)memset(buffer, 0, sizeof(buffer));
   47     fd = open(filename, O_RDWR | O_CREAT, 0666);
   48     if (fd < 0)
   49         return 1;
   50     (void)unlink(filename);
   51 
   52     rc = write(fd, buffer, sz);
   53     if (rc != (ssize_t)sz) {
   54         goto err;
   55     }
   56     ptr = mmap(NULL, sz, PROT_READ | PROT_WRITE,
   57         MAP_PRIVATE, fd, 0);
   58     if (ptr == MAP_FAILED)
   59         goto err;
   60 
   61     ret = msync(ptr, sz, MS_ASYNC);
   62     (void)ret;
   63     ret = msync(ptr, sz, MS_SYNC);
   64     (void)ret;
   65     ret = msync(ptr, sz, MS_INVALIDATE);
   66     (void)ret;
   67 
   68     (void)munmap(ptr, sz);
   69     err = 0;
   70 err:
   71     (void)close(fd);
   72 
   73     return err;
   74 }