rle_open_f_noexit man page on Tru64

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RLE_OPEN_F(3)							 RLE_OPEN_F(3)

NAME
       rle_open_f - Open a binary file for input or output with defaults.
       rle_open_f_noexit - Returns error code instead of exiting.

SYNOPSIS
       FILE *rle_open_f( prog_name, file_name, mode )
       char *prog_name, *file_name, *mode;

       FILE *rle_open_f_noexit( prog_name, file_name, mode )
       char *prog_name, *file_name, *mode;

DESCRIPTION
       The  function  rle_open_f  is  provided to simplify the task of opening
       files in toolkit programs.  It works similarly to fopen(3), but it also
       provides	 error checking and messages, and default values for input and
       output.	If the specified file_name cannot be opened, an error  message
       is  printed and the program exits.  A variant rle_open_f_noexit is pro‐
       vided which will return NULL if the file cannot be  opened.   An	 error
       message is still printed.

       On  those  systems which require it, a 'b' will be appended to the mode
       string so that the file will be opened in binary mode.

       If the file_name is NULL or "-", then stdin will be returned for	 input
       (mode  "r")  files  and stdout will be returned for output (mode "w" or
       "a") files.

       The following two options are  available	 only  on  systems  supporting
       pipes.	If the file_name starts with a "|" character, then the rest of
       the file name will be taken as a sh(1) command.	If mode is "r", a pipe
       from  the output of the sh command will be returned.  If mode is "w" or
       "a", a pipe to the input of the sh command will be returned.

       If the file_name ends with the suffix ".Z" (and	does  not  start  with
       "|"),  then the compress(1) program will be invoked to uncompress (mode
       "r") or compress (mode "w" or  "a")  the	 file.	 The  file  descriptor
       returned by rle_open_f will be a pipe from or to the compress program.

SEE ALSO
       fopen(3), popen(3), compress(1).

AUTHOR
       Gerald Winter
       Spencer W. Thomas
       University of Michigan

BUGS
       If  the	command	 invoked  via  popen  does  not exist, the popen still
       returns successfully, and the underlying sh prints an error message.

       There is no way of telling that a particular FILE pointer has been cre‐
       ated  by	 popen,	 so  it	 isn't possible to cleanly close the pipe with
       pclose.	In fact, the eventual output file may not even	exist  by  the
       time the program exits.

4th Berkeley Distribution	    2/2/87			 RLE_OPEN_F(3)
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