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
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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