Tcl_GetOpenFile(3) Tcl Library Procedures Tcl_GetOpenFile(3)______________________________________________________________________________NAME
Tcl_GetOpenFile - Get a standard IO File * handle from a channel. (Unix
Tcl_GetOpenFile(interp, string, write, checkUsage, filePtr)
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.
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 interp->result will contain an error message. In the cur‐
rent 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)