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- '\" $Header: /user6/ouster/tcl/man/RCS/EnterFile.3,v 1.4 93/08/27 13:20:42 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
- .\"
- .\" .HS name section [date [version]]
- .\" Replacement for .TH in other man pages. See below for valid
- .\" section names.
- .\"
- .\" .AP type name in/out [indent]
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- .\" .AS [type [name]]
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- .\"
- '\" # Heading for Tcl/Tk man pages
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- .HS Tcl_EnterFile tclc 7.0
- .BS
- .SH NAME
- Tcl_EnterFile, Tcl_GetOpenFile, Tcl_FilePermissions \- manipulate the table of open files
- .SH SYNOPSIS
- .nf
- \fB#include <tcl.h>\fR
- .sp
- \fBTcl_EnterFile\fR(\fIinterp, file, permissions\fR)
- .sp
- int
- \fBTcl_GetOpenFile\fR(\fIinterp, string, write, checkUsage, filePtr\fR)
- .sp
- int
- \fBTcl_FilePermissions(\fIfile\fR)
- .SH ARGUMENTS
- .AS Tcl_Interp checkUsage
- .AP Tcl_Interp *interp in
- Tcl interpreter from which file is to be accessed.
- .AP FILE *file in
- Handle for file that is to become accessible in \fIinterp\fR.
- .AP int permissions in
- OR-ed combination of TCL_FILE_READABLE and TCL_FILE_WRITABLE;
- indicates whether \fIfile\fR was opened for reading or writing or both.
- .AP char *string in
- String identifying file, such as \fBstdin\fR or \fBfile4\fR.
- .AP int write in
- Non-zero means the file will be used for writing, zero means it will
- be used for reading.
- .AP int checkUsage in
- If non-zero, then an error will be generated if the file wasn't opened
- for the access indicated by \fIwrite\fR.
- .AP FILE **filePtr out
- Points to word in which to store pointer to FILE structure for
- the file given by \fIstring\fR.
- .BE
-
- .SH DESCRIPTION
- .PP
- These procedures provide access to Tcl's file naming mechanism.
- \fBTcl_EnterFile\fR enters an open file into Tcl's file table so
- that it can be accessed using Tcl commands like \fBgets\fR,
- \fBputs\fR, \fBseek\fR, and \fBclose\fR.
- It returns in \fIinterp->result\fR an identifier such as \fBfile4\fR
- that can be used to refer to the file in subsequent Tcl commands.
- \fBTcl_EnterFile\fR is typically used to implement new Tcl commands
- that open sockets, pipes, or other kinds of files not already supported
- by the built-in commands.
- .PP
- \fBTcl_GetOpenFile\fR takes as argument a file identifier of the form
- returned by the \fBopen\fR command or \fBTcl_EnterFile\fR and
- returns at \fI*filePtr\fR a pointer to the FILE structure for
- the file.
- The \fIwrite\fR argument indicates whether the FILE pointer will
- be used for reading or writing.
- In some cases, such as a file that connects to a pipeline of
- subprocesses, different FILE pointers will be returned for reading
- and writing.
- \fBTcl_GetOpenFile\fR normally returns TCL_OK.
- If an error occurs in \fBTcl_GetOpenFile\fR (e.g. \fIstring\fR didn't
- make any sense or \fIcheckUsage\fR was set and the file wasn't opened
- for the access specified by \fIwrite\fR) then TCL_ERROR is returned
- and \fIinterp->result\fR will contain an error message.
- If \fIcheckUsage\fR is zero and the file wasn't opened for the
- access specified by \fIwrite\fR, then the FILE pointer returned
- at \fI*filePtr\fR may not correspond to \fIwrite\fR.
- .PP
- \fBTcl_FilePermissions\fR returns an OR-ed combination of the
- mask bits TCL_FILE_READABLE and TCL_FILE_WRITABLE; these indicate
- whether the given file was opened for reading or writing or both.
- If \fIfile\fR does not refer to a file in Tcl's file table then
- \-1 is returned.
-
- .SH KEYWORDS
- file table, permissions, pipeline, read, write
-