diff options
Diffstat (limited to 'doc/read.n')
| -rw-r--r-- | doc/read.n | 17 |
1 files changed, 10 insertions, 7 deletions
@@ -16,7 +16,6 @@ read \- Read from a channel .sp \fBread \fIchannelId numChars\fR .BE - .SH DESCRIPTION .PP In the first form, the \fBread\fR command reads all of the data from @@ -51,36 +50,40 @@ newline characters according to the \fB\-translation\fR option for the channel. See the \fBfconfigure\fR manual entry for a discussion on ways in which \fBfconfigure\fR will alter input. - .SH "USE WITH SERIAL PORTS" '\" Note: this advice actually applies to many versions of Tcl - +.PP For most applications a channel connected to a serial port should be -configured to be nonblocking: \fBfconfigure \fIchannelId \fB\-blocking +configured to be nonblocking: \fBfconfigure\fI channelId \fB\-blocking \fI0\fR. Then \fBread\fR behaves much like described above. Care must be taken when using \fBread\fR on blocking serial ports: .TP \fBread \fIchannelId numChars\fR +. In this form \fBread\fR blocks until \fInumChars\fR have been received from the serial port. .TP \fBread \fIchannelId\fR +. In this form \fBread\fR blocks until the reception of the end-of-file -character, see \fBfconfigure -eofchar\fR. If there no end-of-file +character, see \fBfconfigure\fR \fB\-eofchar\fR. If there no end-of-file character has been configured for the channel, then \fBread\fR will block forever. .SH "EXAMPLE" +.PP This example code reads a file all at once, and splits it into a list, with each line in the file corresponding to an element in the list: +.PP .CS set fl [open /proc/meminfo] set data [\fBread\fR $fl] close $fl set lines [split $data \en] .CE - .SH "SEE ALSO" file(n), eof(n), fblocked(n), fconfigure(n), Tcl_StandardChannels(3) - .SH KEYWORDS blocking, channel, end of line, end of file, nonblocking, read, translation, encoding +'\"Local Variables: +'\"mode: nroff +'\"End: |