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diff --git a/man3p/fileno.3p b/man3p/fileno.3p new file mode 100644 index 000000000..688ae2bc8 --- /dev/null +++ b/man3p/fileno.3p @@ -0,0 +1,67 @@ +.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved +.TH "FILENO" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual" +.\" fileno +.SH NAME +fileno \- map a stream pointer to a file descriptor +.SH SYNOPSIS +.LP +\fB#include <stdio.h> +.br +.sp +int fileno(FILE *\fP\fIstream\fP\fB); \fP +\fB +.br +\fP +.SH DESCRIPTION +.LP +The \fIfileno\fP() function shall return the integer file descriptor +associated with the stream pointed to by +\fIstream\fP. +.SH RETURN VALUE +.LP +Upon successful completion, \fIfileno\fP() shall return the integer +value of the file descriptor associated with \fIstream\fP. +Otherwise, the value -1 shall be returned and \fIerrno\fP set to indicate +the error. +.SH ERRORS +.LP +The \fIfileno\fP() function may fail if: +.TP 7 +.B EBADF +The \fIstream\fP argument is not a valid stream. +.sp +.LP +\fIThe following sections are informative.\fP +.SH EXAMPLES +.LP +None. +.SH APPLICATION USAGE +.LP +None. +.SH RATIONALE +.LP +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 \fIfork\fP() +and \fIexec\fP. In particular, it would not be possible to write a +portable version of the \fIsh\fP command interpreter (although there +may be other constraints that would prevent that +portability). +.SH FUTURE DIRECTIONS +.LP +None. +.SH SEE ALSO +.LP +\fIInteraction of File Descriptors and Standard I/O Streams\fP , \fIfdopen\fP() +, \fIfopen\fP() , \fIstdin\fP() , the Base +Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\fP +.SH COPYRIGHT +Portions of this text are reprinted and reproduced in electronic form +from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology +-- Portable Operating System Interface (POSIX), The Open Group Base +Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of +Electrical and Electronics Engineers, Inc and The Open Group. In the +event of any discrepancy between this version and the original IEEE and +The Open Group Standard, the original IEEE and The Open Group Standard +is the referee document. The original Standard can be obtained online at +http://www.opengroup.org/unix/online.html . |