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author | William Joye <wjoye@cfa.harvard.edu> | 2016-12-21 22:56:22 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2016-12-21 22:56:22 (GMT) |
commit | d1a6de55efc90f190dee42ab8c4fa9070834e77d (patch) | |
tree | ec633f5608ef498bee52a5f42c12c49493ec8bf8 /tcl8.6/doc/GetOpnFl.3 | |
parent | 5514e37335c012cc70f5b9aee3cedfe3d57f583f (diff) | |
parent | 98acd3f494b28ddd8c345a2bb9311e41e2d56ddd (diff) | |
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Merge commit '98acd3f494b28ddd8c345a2bb9311e41e2d56ddd' as 'tcl8.6'
Diffstat (limited to 'tcl8.6/doc/GetOpnFl.3')
-rw-r--r-- | tcl8.6/doc/GetOpnFl.3 | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/tcl8.6/doc/GetOpnFl.3 b/tcl8.6/doc/GetOpnFl.3 new file mode 100644 index 0000000..86d1b94 --- /dev/null +++ b/tcl8.6/doc/GetOpnFl.3 @@ -0,0 +1,58 @@ +'\" +'\" Copyright (c) 1996-1997 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH Tcl_GetOpenFile 3 8.0 Tcl "Tcl Library Procedures" +.so man.macros +.BS +.SH NAME +Tcl_GetOpenFile \- Return a FILE* for a channel registered in the given interpreter (Unix only) +.SH SYNOPSIS +.nf +\fB#include <tcl.h>\fR +.sp +int +\fBTcl_GetOpenFile\fR(\fIinterp, chanID, write, checkUsage, filePtr\fR) +.sp +.SH ARGUMENTS +.AS Tcl_Interp checkUsage out +.AP Tcl_Interp *interp in +Tcl interpreter from which file handle is to be obtained. +.AP "const char" *chanID in +String identifying channel, 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 was not opened +for the access indicated by \fIwrite\fR. +.AP ClientData *filePtr out +Points to word in which to store pointer to FILE structure for +the file given by \fIchanID\fR. +.BE + +.SH DESCRIPTION +.PP +\fBTcl_GetOpenFile\fR takes as argument a file identifier of the form +returned by the \fBopen\fR command 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 channel that connects to a pipeline of +subprocesses, different FILE pointers will be returned for reading +and writing. +\fBTcl_GetOpenFile\fR normally returns \fBTCL_OK\fR. +If an error occurs in \fBTcl_GetOpenFile\fR (e.g. \fIchanID\fR did not +make any sense or \fIcheckUsage\fR was set and the file was not opened +for the access specified by \fIwrite\fR) then \fBTCL_ERROR\fR is returned +and the interpreter's result will contain an error message. +In the current implementation \fIcheckUsage\fR is ignored and consistency +checks are always performed. +.PP +Note that this interface is only supported on the Unix platform. + +.SH KEYWORDS +channel, file handle, permissions, pipeline, read, write |