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stdin is of type FILE *,
is there a fd macro for it?
Or do I need to convert it myself?
939
Since the symbols stdin, stdout, and stderr are specified to be macros, assigning to them is nonportable.
Standard input value stdin. Its value is 0.
In Linux, stdin is the standard input stream. This accepts text as its input. Text output from the command to the shell is delivered via the stdout (standard out) stream. Error messages from the command are sent through the stderr (standard error) stream.
STDIN_FILENO from unistd.h
154
fileno(stdin)
42
The following are the integer file descriptors for the standard streams:
stdin
stdout
stderr
2
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