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annotate c/blocked_mmap/main.cc @ 30:edecf5b459c9

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rename mmap to blocked_mmap
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Sun, 11 May 2014 19:32:39 +0900
parents c/mmap/main.cc@b9d005c23aaa
children 4580f792d4c6
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <unistd.h>
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5 #include <fcntl.h>
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6 #include <sys/stat.h>
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7 #include <sys/types.h>
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8 #include <sys/mman.h>
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11 const char *usr_help_str = "Usage : ./mmap [-file filename]";
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13 int main(int argc, char *argv[]){
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15 struct stat sb;
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17 char *filename = 0;
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18 for (int i = 1; argv[i]; ++i) {
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19 if (strcmp(argv[i], "-file") == 0){
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20 filename = argv[i+1]; i++;
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21 }
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22 }
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24 if (filename == 0){
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25 puts(usr_help_str);
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26 exit(1);
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27 }
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29 int fd = -1;
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30 if ((fd=open(filename,O_RDONLY,0666))==0){
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31 fprintf(stderr,"can't open %s\n",filename);
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32 }
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34 if (fstat(fd,&sb)){
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35 fprintf(stderr,"can't open %s\n",filename);
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36 }
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38 int file_size = sb.st_size;
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39 int page_size = getpagesize();
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41 int loop_num = file_size / page_size;
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42 loop_num += (file_size % page_size != 0);
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44 char * file_mmap = NULL;
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45 char * file_head = NULL; // head of read file
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47 for (int i = 0; i < loop_num; i++) {
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48 // mmap 6th arg must be a multiple of the paging size.
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49 file_mmap = (char *)mmap(0, page_size, PROT_READ, MAP_PRIVATE, fd, i*page_size);
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50 if (i == 0) file_head = file_mmap;
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51 file_mmap += page_size;
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52 }
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54 printf("%s\n",file_head);
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56 munmap(file_mmap, file_size);
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57 close(fd);
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59 return 0;
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60 }