2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
170 lines
4.3 KiB
Groff
170 lines
4.3 KiB
Groff
.\" $NetBSD: getc.3,v 1.12 2003/08/07 16:43:26 agc Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getc.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd April 25, 2001
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.Dt GETC 3
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.Os
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.Sh NAME
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.Nm fgetc ,
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.Nm getc ,
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.Nm getchar ,
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.Nm getc_unlocked ,
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.Nm getchar_unlocked ,
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.Nm getw
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.Nd get next character or word from input stream
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdio.h
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.Ft int
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.Fn fgetc "FILE *stream"
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.Ft int
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.Fn getc "FILE *stream"
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.Ft int
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.Fn getchar
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.Ft int
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.Fn getc_unlocked "FILE *stream"
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.Ft int
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.Fn getchar_unlocked
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.Ft int
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.Fn getw "FILE *stream"
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.Sh DESCRIPTION
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The
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.Fn fgetc
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function
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obtains the next input character (if present) from the stream pointed at by
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.Fa stream ,
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or the next character pushed back on the stream via
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.Xr ungetc 3 .
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.Pp
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The
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.Fn getc
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function
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acts essentially identically to
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.Fn fgetc ,
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but is a macro that expands in-line.
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.Pp
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The
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.Fn getchar
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function
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is equivalent to:
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getc with the argument stdin.
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.Pp
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The
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.Fn getc_unlocked
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and
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.Fn getchar_unlocked
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functions provide functionality identical to that of
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.Fn getc
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and
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.Fn getchar ,
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respectively, but do not perform implicit locking of the streams they
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operate on.
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In multi-threaded programs they may be used
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.Em only
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within a scope in which the stream
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has been successfully locked by the calling thread using either
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.Xr flockfile 3
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or
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.Xr ftrylockfile 3 ,
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and may later be released using
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.Xr funlockfile 3 .
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.Pp
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The
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.Fn getw
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function
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obtains the next
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.Em int
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(if present)
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from the stream pointed at by
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.Fa stream .
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.Sh RETURN VALUES
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If successful, these routines return the next requested object
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from the
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.Fa stream .
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If the stream is at end-of-file or a read error occurs,
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the routines return
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.Dv EOF .
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The routines
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.Xr feof 3
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and
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.Xr ferror 3
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must be used to distinguish between end-of-file and error.
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If an error occurs, the global variable
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.Va errno
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is set to indicate the error.
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The end-of-file condition is remembered, even on a terminal, and all
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subsequent attempts to read will return
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.Dv EOF
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until the condition is cleared with
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.Xr clearerr 3 .
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.Sh SEE ALSO
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.Xr ferror 3 ,
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.Xr flockfile 3 ,
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.Xr fopen 3 ,
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.Xr fread 3 ,
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.Xr ftrylockfile 3 ,
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.Xr funlockfile 3 ,
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.Xr putc 3 ,
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.Xr ungetc 3
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.Sh STANDARDS
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The
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.Fn fgetc ,
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.Fn getc
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and
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.Fn getchar
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functions
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conform to
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.St -ansiC .
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The
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.Fn getc_unlocked
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and
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.Fn getchar_unlocked
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functions conform to
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.St -p1003.1-96 .
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.Sh BUGS
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Since
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.Dv EOF
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is a valid integer value,
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.Xr feof 3
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and
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.Xr ferror 3
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must be used to check for failure after calling
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.Fn getw .
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The size and byte order of an
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.Em int
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varies from one machine to another, and
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.Fn getw
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is not recommended for portable applications.
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