Index: stable/11/lib/libc/stdio/fopen.3
===================================================================
--- stable/11/lib/libc/stdio/fopen.3	(revision 328005)
+++ stable/11/lib/libc/stdio/fopen.3	(revision 328006)
@@ -1,358 +1,358 @@
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\"
 .\" This code is derived from software contributed to Berkeley by
 .\" Chris Torek and the American National Standards Committee X3,
 .\" on Information Processing Systems.
 .\"
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 .\" modification, are permitted provided that the following conditions
 .\" are met:
 .\" 1. Redistributions of source code must retain the above copyright
 .\"    notice, this list of conditions and the following disclaimer.
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 .\"    notice, this list of conditions and the following disclaimer in the
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 .\" 4. Neither the name of the University nor the names of its contributors
 .\"    may be used to endorse or promote products derived from this software
 .\"    without specific prior written permission.
 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 .\"
 .\"     @(#)fopen.3	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
 .Dd January 30, 2013
 .Dt FOPEN 3
 .Os
 .Sh NAME
 .Nm fopen ,
 .Nm fdopen ,
 .Nm freopen ,
 .Nm fmemopen
 .Nd stream open functions
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In stdio.h
 .Ft FILE *
 .Fn fopen "const char * restrict path" "const char * restrict mode"
 .Ft FILE *
 .Fn fdopen "int fildes" "const char *mode"
 .Ft FILE *
 .Fn freopen "const char *path" "const char *mode" "FILE *stream"
 .Ft FILE *
 .Fn fmemopen "void *restrict *buf" "size_t size" "const char * restrict mode"
 .Sh DESCRIPTION
 The
 .Fn fopen
 function
 opens the file whose name is the string pointed to by
 .Fa path
 and associates a stream with it.
 .Pp
 The argument
 .Fa mode
 points to a string beginning with one of the following letters:
 .Bl -tag -width indent
 .It Dq Li r
 Open for reading.
 The stream is positioned at the beginning of the file.
 Fail if the file does not exist.
 .It Dq Li w
 Open for writing.
 The stream is positioned at the beginning of the file.
-Create the file if it does not exist.
+Truncate the file to zero length if it exists or create the file if it does not exist.
 .It Dq Li a
 Open for writing.
 The stream is positioned at the end of the file.
 Subsequent writes to the file will always end up at the then current
 end of file, irrespective of any intervening
 .Xr fseek 3
 or similar.
 Create the file if it does not exist.
 .El
 .Pp
 An optional
 .Dq Li +
 following
 .Dq Li r ,
 .Dq Li w ,
 or
 .Dq Li a
 opens the file for both reading and writing.
 An optional
 .Dq Li x
 following
 .Dq Li w
 or
 .Dq Li w+
 causes the
 .Fn fopen
 call to fail if the file already exists.
 An optional
 .Dq Li e
 following the above
 causes the
 .Fn fopen
 call to set the
 .Dv FD_CLOEXEC
 flag on the underlying file descriptor.
 .Pp
 The
 .Fa mode
 string can also include the letter
 .Dq Li b
 after either the
 .Dq Li +
 or the first letter.
 This is strictly for compatibility with
 .St -isoC
 and has effect only for
 .Fn fmemopen
 ; otherwise
 .Dq Li b
 is ignored.
 .Pp
 Any created files will have mode
 .Do Dv S_IRUSR
 \&|
 .Dv S_IWUSR
 \&|
 .Dv S_IRGRP
 \&|
 .Dv S_IWGRP
 \&|
 .Dv S_IROTH
 \&|
 .Dv S_IWOTH Dc
 .Pq Li 0666 ,
 as modified by the process'
 umask value (see
 .Xr umask 2 ) .
 .Pp
 Reads and writes may be intermixed on read/write streams in any order,
 and do not require an intermediate seek as in previous versions of
 .Em stdio .
 This is not portable to other systems, however;
 .Tn ANSI C
 requires that
 a file positioning function intervene between output and input, unless
 an input operation encounters end-of-file.
 .Pp
 The
 .Fn fdopen
 function associates a stream with the existing file descriptor,
 .Fa fildes .
 The mode
 of the stream must be compatible with the mode of the file descriptor.
 The
 .Dq Li x
 mode option is ignored.
 If the
 .Dq Li e
 mode option is present, the
 .Dv FD_CLOEXEC
 flag is set, otherwise it remains unchanged.
 When the stream is closed via
 .Xr fclose 3 ,
 .Fa fildes
 is closed also.
 .Pp
 The
 .Fn freopen
 function
 opens the file whose name is the string pointed to by
 .Fa path
 and associates the stream pointed to by
 .Fa stream
 with it.
 The original stream (if it exists) is closed.
 The
 .Fa mode
 argument is used just as in the
 .Fn fopen
 function.
 .Pp
 If the
 .Fa path
 argument is
 .Dv NULL ,
 .Fn freopen
 attempts to re-open the file associated with
 .Fa stream
 with a new mode.
 The new mode must be compatible with the mode that the stream was originally
 opened with:
 Streams open for reading can only be re-opened for reading,
 streams open for writing can only be re-opened for writing,
 and streams open for reading and writing can be re-opened in any mode.
 The
 .Dq Li x
 mode option is not meaningful in this context.
 .Pp
 The primary use of the
 .Fn freopen
 function
 is to change the file associated with a
 standard text stream
 .Dv ( stderr , stdin ,
 or
 .Dv stdout ) .
 .Pp
 The
 .Fn fmemopen
 function
 associates the buffer given by the
 .Fa buf
 and
 .Fa size
 arguments with a stream.
 The
 .Fa buf
 argument is either a null pointer or point to a buffer that
 is at least
 .Fa size
 bytes long.
 If a null pointer is specified as the
 .Fa buf
 argument,
 .Fn fmemopen
 allocates
 .Fa size
 bytes of memory.
 This buffer is automatically freed when the stream is closed.
 Buffers can be opened in text-mode (default) or binary-mode
 (if
 .Dq Li b
 is present in the second or third position of the
 .Fa mode
 argument).
 Buffers opened in text-mode make sure that writes are terminated with a
 .Dv NULL
 byte, if the last write hasn't filled up the whole buffer.
 Buffers opened in binary-mode never append a
 .Dv NULL
 byte.
 .Sh RETURN VALUES
 Upon successful completion
 .Fn fopen ,
 .Fn fdopen
 and
 .Fn freopen
 return a
 .Tn FILE
 pointer.
 Otherwise,
 .Dv NULL
 is returned and the global variable
 .Va errno
 is set to indicate the error.
 .Sh ERRORS
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The
 .Fa mode
 argument
 to
 .Fn fopen ,
 .Fn fdopen ,
 .Fn freopen ,
 or
 .Fn fmemopen
 was invalid.
 .El
 .Pp
 The
 .Fn fopen ,
 .Fn fdopen ,
 .Fn freopen
 and
 .Fn fmemopen
 functions
 may also fail and set
 .Va errno
 for any of the errors specified for the routine
 .Xr malloc 3 .
 .Pp
 The
 .Fn fopen
 function
 may also fail and set
 .Va errno
 for any of the errors specified for the routine
 .Xr open 2 .
 .Pp
 The
 .Fn fdopen
 function
 may also fail and set
 .Va errno
 for any of the errors specified for the routine
 .Xr fcntl 2 .
 .Pp
 The
 .Fn freopen
 function
 may also fail and set
 .Va errno
 for any of the errors specified for the routines
 .Xr open 2 ,
 .Xr fclose 3
 and
 .Xr fflush 3 .
 .Pp
 The
 .Fn fmemopen
 function
 may also fail and set
 .Va errno
 if the
 .Fa size
 argument is 0.
 .Sh SEE ALSO
 .Xr open 2 ,
 .Xr fclose 3 ,
 .Xr fileno 3 ,
 .Xr fseek 3 ,
 .Xr funopen 3
 .Sh STANDARDS
 The
 .Fn fopen
 and
 .Fn freopen
 functions
 conform to
 .St -isoC ,
 with the exception of the
 .Dq Li x
 mode option which conforms to
 .St -isoC-2011 .
 The
 .Fn fdopen
 function
 conforms to
 .St -p1003.1-88 .
 The
 .Dq Li e
 mode option does not conform to any standard
 but is also supported by glibc.
 The
 .Fn fmemopen
 function
 conforms to
 .St -p1003.1-2008 .
 The
 .Dq Li b
 mode does not conform to any standard
 but is also supported by glibc.
Index: stable/11
===================================================================
--- stable/11	(revision 328005)
+++ stable/11	(revision 328006)

Property changes on: stable/11
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /head:r327099