test_write.c

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <time.h>

#include <stdlib.h>

#include <unistd.h>

#define MAX_SIZE 1024*80

int main(int argc, char *argv[])

{

int odd_num, i;

int file_len;

int len,write_len, n;

char *buf = (char *)malloc(MAX_SIZE);

int fd;

char file_name[] = {"/record/hd01//qh00015.dat"};

fd = open(file_name, O_RDWR | O_CREAT);

if(-1 == fd)

{

printf("TTT-----open fail \n");

return -1;

}

len = MAX_SIZE;

file_len = 0;

odd_num = 0;

lseek(fd, 0, SEEK_SET);

while(1)

{

#if 1

if(odd_num < 20*1024)

{

odd_num += 1024;

}

else

{

odd_num = 0;

}

/*

if(odd_num < 1024)

{

odd_num += 1;

}

else

{

odd_num = 0;

}

*/

#endif

//-------------------------------------------------------------------------------------------------------------------

//lseek(fd, file_len, SEEK_SET);

write_len = len - odd_num;

n = write(fd, buf, write_len);

if(n < 0)

{

printf("TTT--22222222222--write error \n");

}

else

{

printf("TTT----write_len[%d]--------write-return[%d]-------odd_num[%d]---file_name[%s]  \n", write_len, n, odd_num, file_name);

}

file_len += n;

//-------------------------------------------------------------------------------------------------------------------

if(512*1024*1024 <= file_len)

{

lseek(fd, 0, SEEK_SET);

file_len = 0;

printf("TTT----lseek(fd, 0, SEEK_SET)---\n");

}

usleep(1000*100);

}

return 0;

}