Donny9 commented on issue #6710:
URL: https://github.com/apache/nuttx/issues/6710#issuecomment-1751674630
@pkarashchenko This examples can run with pass result on linux, but can't
pass on nuttx, because this issue: newd and oldd can't share file offset,
because they are different file handle in nuttx.
```
//#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <syslog.h>
//#include "test.h"
#define TESTFILE "testDup2File1"
#define TEST_FAIL -1
#define TEST_PASS 0
/****************************************************************************
* Name: dup
* Example description:
1. Open a file and get the file identifier fd.
2. Copy the file identifier to newfd
3. Open the file through newfd. And check the return results
* Test item: open() write() dup2()
* Expect results: TEST PASSED
****************************************************************************/
int main(void)
{
char buf[16] = {0};
off_t currpos;
int fd1 = open(TESTFILE, O_RDWR | O_CREAT, 0777);
if (fd1 == -1)
{
printf("open file fail !\n");
return TEST_FAIL;
}
int fd2 = open(TESTFILE, O_RDWR | O_CREAT, 0777);
if (fd2 == -1)
{
close(fd1);
printf("open file fail !\n");
return TEST_FAIL;
}
int ret = dup2(fd1, fd2);
if (ret == -1)
{
close(fd1);
close(fd2);
printf("dup2 error , return : %d!\n", ret);
return TEST_FAIL;
}
syslog(LOG_INFO, "current fd = %d\n", ret);
char *buf1 = "hello ";
char *buf2 = "world!";
write(fd1, buf1, strlen(buf1));
write(fd2, buf2, strlen(buf2));
fsync(fd1);
/* reset file pos use fd2 */
lseek(fd2, 0, SEEK_SET);
/* Check if file pos is shared */
currpos = lseek(fd1, 0, SEEK_CUR);
if (currpos != 0)
{
printf("Do not shared file pos after dup2()\n");
close(fd1);
close(fd2);
return TEST_FAIL;
}
ret = read(fd1, buf, 16);
if (ret <= 0)
{
printf("read fail\n");
close(fd1);
close(fd2);
return TEST_FAIL;
}
close(fd1);
close(fd2);
if (strncmp(buf, "hello world!", 12) == 0)
{
printf("test pass\n");
return TEST_PASS;
}
printf("test fail\n");
return TEST_FAIL;
}
```
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