Tcl_GetOpenFile(3) Tcl Library Procedures Tcl_GetOpenFile(3) 







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








#include <tcl.h>

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











  
Tcl_Interp *interp (in)

  
Tcl interpreter from which file handle is to be obtained.

  
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 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_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







  

    8.0
    Tcl