Linux文件操作

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#define MAX_SIZE 1024*200

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

{

int file_len;

int len, n;

char *ptr = NULL;

char buf[MAX_SIZE] = {0};

int fd;

char file_name[] = {"/record/hd01/qh00013.dat"};

fd = open(file_name, O_RDWR | O_CREAT | O_TRUNC);

if(-1 == fd)

{

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

return -1;

}

len = sizeof(buf);

printf("TTT----len[%d]-----\n", len);

ptr = buf;

n   = len;

while(0 < n)

{

memcpy(ptr, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 32);

ptr += 32;

n   -= 32;

}

file_len = 0;

lseek(fd, 0, SEEK_SET);

while(1)

{

n = write(fd, buf, len);

if(n < 0)

{

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

}

else

{

printf("TTT----write len[%d]----n[%d]  \n", len, n);

}

file_len += n;

if(500*1024*1024 < file_len)

{

file_len = 0;

lseek(fd, 0, SEEK_SET);

}

usleep(1000*10);

}

return 0;

}

==========================================================================

#include <stdio.h>

#include <string.h>

#define MAX_SIZE 1024*4*5

int main()

{

int len, n, file_len;

char buf[MAX_SIZE] = {0};

char *ptr = NULL;

FILE* fp = NULL;

char file_name[] = {"/record/hd01/qh00013.dat"};

fp = fopen(file_name, "r+");

if(NULL == fp)

{

printf("fopen fail\n");

return -1;

}

len = sizeof(buf);

printf("TTT----len[%d]-----\n", len);

ptr = buf;

n   = len;

while(0 < n)

{

memcpy(ptr, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 32);

ptr += 32;

n   -= 32;

}

file_len = 0;

while(1)

{

//if(0 != feof(fp))

if(file_len > 500*1024*1024)

{

fseek(fp, 0, SEEK_SET);

}

n = fwrite(buf, 1, len, fp);

usleep(1000);

printf("TTT------n[%d]-------\n", n);

}

return 0;

}