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5Q:

How to find the file descriptor of stdout and stderr in C?

I’m trying to capture the output of a shell command into a file (not just a buffer, but a real file). What I have so far is
int fd = open(« MyFile.txt », O_WRONLY | O_CREAT | O_TRUNC, 0666);
char buffer[4096];

int nRead;
while (1) {
nRead = read(0, buffer, 4096);
// Do something with the buffer
}

This works fine, but the problem is that if the program outputs any errors (via stderr), the read() in the while loop will fail and the program will never catch the errors.
Is there a way to find out what the current file descriptor is of stdout and stderr? I would then like to try to read to fd 1 for stdout and 2 for stderr.
I have looked into dup2, but this only seems to work for stdin/stdout.

A:

If you want to use the return value of read() instead of a special file descriptor, call it in a pipe:
int error_fd = open(« MyFile.txt », O_WRONLY | O_CREAT | O_TRUNC, 0666);
int out_fd = dup(error_fd);

int nRead;
while ((nRead = read(0, buffer, 4096)) > 0)
// Do something with the buffer

The idea is that the read() function will return an error if the read will not be successful (i.e. when read returns 0 and you have reached the end of the file). So the loop will be exited when the read() function fails.
If you want to read and write to the same file, the usage is even simpler:
int error_fd = open(« MyFile.txt », O_WRONLY | O_CREAT | O_TR eea19f52d2

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