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CentOS 7.0 - man page for tcl_getopenfile (centos section 3)

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Tcl_GetOpenFile(3)		      Tcl Library Procedures		       Tcl_GetOpenFile(3)


       Tcl_GetOpenFile	-  Return a FILE* for a channel registered in the given interpreter (Unix

       #include <tcl.h>

       Tcl_GetOpenFile(interp, chanID, write, checkUsage, filePtr)

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

       const char *chanID (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 was not 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 chanID.

       Tcl_GetOpenFile takes as argument a file identifier of the form returned by the open  com-
       mand  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_GetOpenFile	normally  returns
       TCL_OK.	 If  an  error	occurs	in Tcl_GetOpenFile (e.g. chanID did not make any sense or
       checkUsage was set and the file was not 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.

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

Tcl					       8.0			       Tcl_GetOpenFile(3)
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