tests/test-read.c

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