Hi Everyone
I am building some A Class HP boxes as web proxy servers, have just installed HP-UX 11.00 and am starting to configure one according to our standard build policy.
However on the A Class I just happened to place the software depot this error message keeps popping up every 2 mins:
... (1 Reply)
What are transparent ioctls messages and when and why we have to issue copyin or copyout kernel utilities with respect to ioctls calls to a Stream. (2 Replies)
Ok, so I have a shell script which runs a specific command, and that command sends it's output to the display. At certain times, the command sends buffered output, and at other times, the command sends unbuffered output in the form of a % progress bar, so if I run the command, the output I receive... (0 Replies)
Anybody have a clue what might have caused the Failures under Class 6? I did a reboot and so far so good, I had been up for about 55 days prior to the reboot. I'm running SCO_SV rel 3.2v5.0.7.
Steve
#netstat -m
streams... (1 Reply)
Here is an example code that shows the issue I have:
#!/bin/bash
counter() {
seq 1000 | while read NUM; do
echo $NUM
echo "debug: $NUM" >&2
sleep 0.1 # slow it down so we know when this loop really ends
done
}
counter | grep --line-buffered "" | head -n1
... (10 Replies)
Hi all,
I have a AIX kernel STREAMS question need your help,
I need to implement a firewall on AIX and get packet raw data then decide pass or drop it,
I've seen similiar firewall code on HP-UX,
on HP-UX, you have to implement a "dlpi STREAMS driver", and specify it as a "dlpi" driver in... (1 Reply)
Hi,
Mentioned in Stevens & Rago "Advanced Programming in the UNIX"
I don't understand why must flush all line-buffered output streams when (a)an unbuffered or (b)a line-buffered stream require data from kernel? (2 Replies)
1. The problem statement, all variables and given/known data:
Basically, I'm trying to search for a particular string pattern within a text file and print "textfile: line_no line". I need to read this in line at a time, but I'm restricted to using unbuffered I/O functions. I'm not sure if I'm... (3 Replies)
hallow all i need your advice about this script
i have script like this:
INDEX=/zpool1/NFS/INDEX/${1}
SCRIPT=/zpool1/NFS/script/${1}
LIST=SAMPLE
cd ${SCRIPT}
for i in `cat ${LIST}`
do
GETDATE=`echo ${i}|awk '{print substr($1,9,8)}'`
/usr/xpg4/bin/awk -F ":" '{close(f);f=$4}{print >>... (4 Replies)
Discussion started by: zvtral
4 Replies
LEARN ABOUT FREEBSD
setbuf
SETBUF(3) BSD Library Functions Manual SETBUF(3)NAME
setbuf, setbuffer, setlinebuf, setvbuf -- stream buffering operations
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
void
setbuf(FILE * restrict stream, char * restrict buf);
void
setbuffer(FILE *stream, char *buf, int size);
int
setlinebuf(FILE *stream);
int
setvbuf(FILE * restrict stream, char * restrict buf, int mode, size_t size);
DESCRIPTION
The three types of buffering available are unbuffered, block buffered, and line buffered. When an output stream is unbuffered, information
appears on the destination file or terminal as soon as written; when it is block buffered many characters are saved up and written as a
block; when it is line buffered characters are saved up until a newline is output or input is read from any stream attached to a terminal
device (typically stdin). The function fflush(3) may be used to force the block out early. (See fclose(3).)
Normally all files are block buffered. When the first I/O operation occurs on a file, malloc(3) is called, and an optimally-sized buffer is
obtained. If a stream refers to a terminal (as stdout normally does) it is line buffered. The standard error stream stderr is always
unbuffered. Note that these defaults may be altered using the stdbuf(1) utility.
The setvbuf() function may be used to alter the buffering behavior of a stream. The mode argument must be one of the following three macros:
_IONBF unbuffered
_IOLBF line buffered
_IOFBF fully buffered
The size argument may be given as zero to obtain deferred optimal-size buffer allocation as usual. If it is not zero, then except for
unbuffered files, the buf argument should point to a buffer at least size bytes long; this buffer will be used instead of the current buffer.
If buf is not NULL, it is the caller's responsibility to free(3) this buffer after closing the stream. (If the size argument is not zero but
buf is NULL, a buffer of the given size will be allocated immediately, and released on close. This is an extension to ANSI C; portable code
should use a size of 0 with any NULL buffer.)
The setvbuf() function may be used at any time, but may have peculiar side effects (such as discarding input or flushing output) if the
stream is ``active''. Portable applications should call it only once on any given stream, and before any I/O is performed.
The other three calls are, in effect, simply aliases for calls to setvbuf(). Except for the lack of a return value, the setbuf() function is
exactly equivalent to the call
setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
The setbuffer() function is the same, except that the size of the buffer is up to the caller, rather than being determined by the default
BUFSIZ. The setlinebuf() function is exactly equivalent to the call:
setvbuf(stream, (char *)NULL, _IOLBF, 0);
RETURN VALUES
The setvbuf() function returns 0 on success, or EOF if the request cannot be honored (note that the stream is still functional in this case).
The setlinebuf() function returns what the equivalent setvbuf() would have returned.
SEE ALSO stdbuf(1), fclose(3), fopen(3), fread(3), malloc(3), printf(3), puts(3)STANDARDS
The setbuf() and setvbuf() functions conform to ISO/IEC 9899:1990 (``ISO C90'').
BUGS
setbuf() usually uses a suboptimal buffer size and should be avoided.
BSD February 18, 2013 BSD