121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#define _GNU_SOURCE /* See feature_test_macros(7) */
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#define __USE_GNU
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#include <fcntl.h>
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#include <unistd.h>
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void test_sync_file_range(char *output, char *text, size_t length)
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{
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int fd = open (output, O_WRONLY | O_CREAT | O_APPEND, 0660);
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if (fd < 0 ) {
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perror("Cannot get page size");
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return;
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}
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int i;
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size_t offset = 0;
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for ( i = 0 ; i < 10000; i++ ) {
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write(fd, text, length);
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sync_file_range(fd, offset, length, SYNC_FILE_RANGE_WRITE);
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offset += length;
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}
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close(fd);
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sleep(5);
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}
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// test based on IBM example https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_71/apis/msync.htm
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void test_msync(char *output, char *text, size_t length)
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{
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int pagesize = sysconf(_SC_PAGE_SIZE);
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if (pagesize < 0) {
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perror("Cannot get page size");
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return;
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}
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int fd = open(output, (O_CREAT | O_TRUNC | O_RDWR), (S_IRWXU | S_IRWXG | S_IRWXO));
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if (fd < 0 ) {
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perror("Cannot open file");
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return;
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}
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off_t lastoffset = lseek( fd, pagesize, SEEK_SET);
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ssize_t written = write(fd, " ", 1);
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if ( written != 1 ) {
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perror("Write error. ");
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close(fd);
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return;
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}
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off_t my_offset = 0;
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void *address = mmap(NULL, pagesize, PROT_WRITE, MAP_SHARED, fd, my_offset);
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if ( address == MAP_FAILED ) {
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perror("Map error. ");
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close(fd);
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return;
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}
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(void) strcpy( (char*) address, text);
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if ( msync( address, pagesize, MS_SYNC) < 0 ) {
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perror("msync failed with error:");
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}
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close(fd);
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sleep(5);
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}
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void test_synchronization(char *output, char *text, size_t length, int (*fcnt)(int))
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{
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int fd = open (output, O_WRONLY | O_CREAT | O_APPEND, 0660);
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if (fd < 0 ) {
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perror("Cannot get page size");
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return;
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}
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int i;
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for ( i = 0 ; i < 10000; i++ )
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write(fd, text, length);
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fcnt(fd);
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close(fd);
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sleep(5);
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}
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void remove_files(char **files) {
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size_t i = 0;
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while (files[i]) {
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unlink(files[i]);
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i++;
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}
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}
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int main()
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{
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char *default_text = { "This is a simple example to test a PR. The sleep is used to create different peaks on charts.\n" };
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char *files[] = { "fsync.txt", "fdatasync.txt", "syncfs.txt", "msync.txt", "sync_file_range.txt", NULL };
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size_t length = strlen(default_text);
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test_synchronization(files[0], default_text, length, fsync);
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test_synchronization(files[1], default_text, length, fdatasync);
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test_synchronization(files[2], default_text, length, syncfs);
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test_msync(files[3], default_text, length);
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test_sync_file_range(files[4], default_text, length);
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sync();
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remove_files(files);
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return 0;
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}
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