fileno - map a stream pointer to a file descriptor
int fileno(FILE *stream);
The fileno() function shall return the integer file descriptor associated with the stream pointed to by stream.
Upon successful completion, fileno() shall return the integer value of the file descriptor associated with stream. Otherwise, the value -1 shall be returned and errno set to indicate the error.
The fileno() function may fail if:
The following sections are informative.
Without some specification of which file descriptors are associated with these streams, it is impossible for an application to set up the streams for another application it starts with fork() and exec. In particular, it would not be possible to write a portable version of the sh command interpreter (although there may be other constraints that would prevent that portability).
Interaction of File Descriptors and Standard I/O Streams , fdopen() , fopen() , stdin() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>
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Created 1996-2022 by Maxim Chirkov
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