why? follow program output: fd = 0.

#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
int fd;

if ((fd = fcntl(STDOUT_FILENO, F_GETFD, 0)) == -1)
{
printf("fcntl error.\n");
}

printf("fd = %d\n", fd);

exit(0);
}

I think output: fd = 1. where error?

Sorry,your program cannot run under my Turbo C or Visual C++ compilers.

compiler cc or gcc

I have no such compilers available.
May be somebody could help you.

From what have discussed above, i found my English is bad.

[译者注]楼主用的是cc或gcc编译器。

int fcntl(int fd,int cmd,long arg);
函数的返回值代表是否成功，如果成功，则返回0，失败则返回-1，为什么lz会认为返回1呢？

而且lz的理解似乎有点错误，fd代表欲设置的文件描述，怎么用来接收返回的错误值呢？