*** UNIX MANUAL PAGE BROWSER ***

fileno(3) Library Functions Manual fileno(3) NAME fileno - Maps a stream pointer to a file descriptor LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <stdio.h> int fileno( FILE *stream); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: fileno(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the input stream. DESCRIPTION The fileno() function returns the integer file descriptor associated with the stream pointed to by stream. NOTES [Digital] The fileno() function may be a macro (depending on the com- pile-time definitions used in the source). Consequently, you cannot use this interface where a function is necessary; for example, a sub- routine pointer cannot point to the interface. RETURN VALUES Upon successful completion, the fileno() macro returns the integer value of the file descriptor associated with the stream parameter. Otherwise, the value -1 is returned. RELATED INFORMATION Functions: clearerr(3), fdopen(3), feof(3), ferror(3), fopen(3), open(2) Standards: standards(5) delim off fileno(3)