GetOpnFl

Tcl_GetOpenFile(3)          Tcl Library Procedures          Tcl_GetOpenFile(3)



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NAME
       Tcl_GetOpenFile - Get a standard IO File * handle from a channel. (Unix
       only)

SYNOPSIS
       #include <tcl.h>

       int
       Tcl_GetOpenFile(interp, string, write, checkUsage, filePtr)


ARGUMENTS
       Tcl_Interp   *interp      (in)      Tcl  interpreter  from  which  file
                                           handle is to be obtained.

       char         *string      (in)      String identifying channel, such as
                                           stdin or file4.

       int          write        (in)      Non-zero means  the  file  will  be
                                           used  for  writing,  zero  means it
                                           will be used for reading.

       int          checkUsage   (in)      If non-zero, then an error will  be
                                           generated if the file wasn't opened
                                           for the access indicated by  write.

       ClientData   *filePtr     (out)     Points  to  word  in which to store
                                           pointer to FILE structure  for  the
                                           file given by string.
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DESCRIPTION
       Tcl_GetOpenFile  takes  as  argument  a  file  identifier  of  the form
       returned by the open command and returns at *filePtr a pointer  to  the
       FILE  structure for the file.  The write argument indicates whether the
       FILE pointer will be used for reading or writing.  In some cases,  such
       as  a  channel  that  connects to a pipeline of subprocesses, different
       FILE pointers will be returned for reading and  writing.   Tcl_GetOpen-
       File  normally  returns  TCL_OK.  If an error occurs in Tcl_GetOpenFile
       (e.g. string didn't make any sense or checkUsage was set and  the  file
       wasn't  opened  for  the  access  specified by write) then TCL_ERROR is
       returned and the interpreter's result will contain  an  error  message.
       In  the  current  implementation  checkUsage is ignored and consistency
       checks are always performed.                                            |

       Note that this interface is only supported on the Unix platform.


KEYWORDS
       channel, file handle, permissions, pipeline, read, write



Tcl                                   8.0                   Tcl_GetOpenFile(3)