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fopen(3S)							     fopen(3S)

       fopen(),	 freopen(),  fdopen()  -  open/reopen a stream file or convert
       file to stream

       Opens the file named by
		      pathname and associates a stream	with  it.   returns  a
		      pointer to the structure associated with the stream.

       substitutes the named file in place of the open
		      stream.	The  original  stream is closed, regardless of
		      whether the open ultimately succeeds.  returns a pointer
		      to  the  structure  associated  with stream and makes an
		      implicit call to (see ferror(3S)).  After	 a  successful
		      call  to	the  orientation of the stream is cleared (see

		      is typically used to attach the preopened streams	 asso‐
		      ciated with and to other files.

       associates a stream with a file descriptor.
		      File  descriptors	 are  obtained	from  or (see open(2),
		      dup(2), creat(2), and pipe(2)), which open files but  do
		      not  return pointers to a structure stream.  Streams are
		      necessary input for many of  the	Section	 (3S)  library
		      routines.	  The  type of stream must agree with the mode
		      of the open file.	 The meanings of type used in the call
		      are  exactly  as specified above, except that and do not
		      cause truncation of the file.

       pathname	      Points to a character string containing the name of  the
		      file to be opened.

       type	      Character	 string having one of the values listed below.
		      The in the following values has no effect.  It exists to
		      distinguish binary files from text files; however, there
		      is no distinction between these types of files  on  UNIX
		      systems (it is required for ISO C standard conformance).

		      r or rb		  open file for reading

		      w or wb		  truncate  to	zero  length or create
					  file for writing

		      a or ab		  append; open file for writing at end
					  of file, or create file or writing

		      r+, rb+, or r+b	  open	file  for  update (reading and

		      w+, wb+, or w+b	  truncate file to zero length or cre‐
					  ate file for update

		      a+, ab+, or a+b	  append;  open	 or  create  file  for
					  update at end-of-file

       When a file is opened for update, both input and output can be done  on
       the  resulting  stream.	However, output cannot be directly followed by
       input without an intervening call to or to a file positioning  function
       or and input cannot be directly followed by output without an interven‐
       ing call to a file positioning  function	 unless	 the  input  operation
       encounters end-of-file.

       When a file is opened for append (that is, when type is or it is impos‐
       sible to overwrite information already in  the  file.   All  output  is
       written	at  the end of the file, regardless of intervening calls to If
       two separate processes open the same file for append, each process  can
       write  freely to the file without fear of destroying output being writ‐
       ten by the other.  Output from the two processes will be intermixed  in
       the file in the order in which it is written.

       HP-UX  binary  file  types  are equivalent to their non-binary counter‐
       parts.  For example, types and are equivalent.

       Upon successful completion, and return a pointer to the stream.	Other‐
       wise, a null pointer is returned and is set to indicate the error.

       and fail if:

       The		 fildes argument is not a valid file descriptor.

       The		 type argument is not a valid mode.

       There is insufficient space to allocate a buffer.

       and fail if:

       Search permission is denied on a component of the path prefix,
			 or  the  file exists and the permissions specified by
			 type are denied, or the file does not exist and write
			 permission  is denied for the parent directory of the
			 file to be created.

       A signal was caught during
			 or function.

       The named file is a directory and
			 type requires write access.

       The calling process has attempted to exceed its open file limit.

       The length of the pathname string exceeds or a  pathname	 component  is
			 longer than while is in effect.

       The system file table is full.

       The named file does not exist or the
			 pathname argument points to an empty string.

       The directory or file system that would contain the new file
			 cannot	 be  expanded, the file does not exist, and it
			 was to be created.

       A component of the path prefix is not a directory.

       The named file is a character special or block special file,
			 and the device associated with the special file  does
			 not exist.

       The named file is a regular file and the size of the file cannot
			 be represented correctly in an object of size in this

       The named file resides on a read-only file system and
			 type requires write access.

       Additional values can be set by the underlying call made from  the  and
       functions (see open(2)).

       creat(2),   dup(2),   open(2),	pipe(2),   fclose(3S),	fgetpos64(3S),
       fseek(3S),  popen(3S),  setbuf(3S),  orientation(5),  thread_safety(5),


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