HP-UX Reference (11i v1 00/12) - 3 Library Functions A-M (vol 6)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man3/!!!intro.3c
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f
fileno(3S) fileno(3S)
NAME
fileno() - map stream pointer to file descriptor
SYNOPSIS
#include <stdio.h>
int fileno(FILE *stream);
Obsolescent Interfaces
int fileno_unlocked(FILE *stream);
DESCRIPTION
fileno() returns the integer file descriptor associated with the named stream; see open(2).
The following symbolic values in <unistd.h> define the file descriptors associated with stdin,
stdout, and stderr when a program is started :
STDIN_FILENO Value of zero for standard input, stdin.
STDOUT_FILENO Value of 1 for standard output, stdout.
STDERR_FILENO Value of 2 for standard error,
stderr.
Obsolescent Interfaces
fileno_unlocked() map stream pointer to file descriptor
APPLICATION USAGE
fileno() is thread-safe. It is not async-cancel-safe.
fileno_unlocked()
is an obsolescent interface supported only for compatibility with existing DCE
applications. New multithreaded applications should use
fileno().
RETURN VALUE
Upon error,
fileno() and fileno_unlocked()
return -1.
SEE ALSO
open(2), flockfile(3S), fopen(3S).
STANDARDS CONFORMANCE
fileno(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1
HP-UX Release 11i: December 2000 − 1 − Section 3−−241
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