tests/test-read.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #ifndef _GNU_SOURCE
   4 #define _GNU_SOURCE
   5 #endif
   6
   7 #ifndef FUSE_USE_VERSION
   8 #define FUSE_USE_VERSION 26
   9 #endif
  10
  11 #define _FILE_OFFSET_BITS 64
  12
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <errno.h>
  19 #include <string.h>
  20 #include <stdlib.h>
  21
  22 #define BUFSIZE 1025
  23 char buf[BUFSIZE];
  24
  25 int read_count = 2;
  26
  27 int main(int argc, char *argv[]){
  28         if(argc < 3){
  29                 fprintf(stderr, "usage: %s <file> <count> [buffer|direct]\n", argv[0]);
  30                 exit(1);
  31         }
  32         char *file = argv[1];
  33         read_count = atoi(argv[2]);
  34         int ret = 0,sum = 0, i = 0, fd = -1;
  35         if(argc == 4 && strncmp(argv[3], "direct",6) == 0)
  36                 fd = open(file, O_RDONLY|O_DIRECT);
  37         else
  38                 fd = open(file, O_RDONLY);
  39
  40         while(i++ < read_count){
  41                 memset(buf, 0, BUFSIZE);
  42                 ret = read(fd, buf, BUFSIZE-1);
  43                 if(ret > 0){
  44                         write(STDOUT_FILENO, buf, ret);
  45                         sum += ret;
  46                 }else if(ret == 0){
  47                         printf("======read end======\n");
  48                         break;
  49                 }else{
  50                         printf("error:%d\n", errno);
  51                         break;
  52                 }
  53                 sleep(1);
  54         }
  55         printf("======read sum: %d======\n", sum);
  56         close(fd);
  57         return 0;
  58 }