How would I test this code on a file on the command line? I believe you use something like a.out? This file name is csvgetline.c
The book also states that there are problems with this implementation, would anyone know by just looking at it?
I want to implement my own simple multi tasking shell in Unix which will take care of redirection (<, >, >>) and piping.
I am just unable to get a concrete idea of how exactly I have to start. I have several books...some are..
1. Maurice Bach- Design Of Unix Operating System
2. Richard... (3 Replies)
Hi,
I am accepting a string from user. compare this output with the awk output as below...
echo "\n\n\tDay : \c"
read day
awk '{ if($day == $2) { if ($mon == $1) { print "Yes" }}}' syslog.txt
I am getting the follwoing error
awk: Field $() is not correct.
The input line... (5 Replies)
Hey Guys
I am trying to implement the malloc function for my OS class and I am having a little trouble with it. I would be really grateful if I could get some hints on this problem.
So I am using a doubly-linked list as my data structure and I have to allocate memory for it (duh...). The... (1 Reply)
Hey Guys
Some of my friends have got together and we are trying to write a basic kernel similar to Linux. I am trying to implement the malloc function in C and I am using a doubly linked list as the primary data structure. I need to allocate memory for this link list (duh...) and I don't feel... (2 Replies)
Hi all,I'm reading <Advanced programming in the UNIX environment>,that book asked the reader to implement a function which has same functions with dup2 without calling fcntl.Could anyone give me a tip?Any help will be appreciated.:) (8 Replies)
Hi
I'm trying to implement CAPWAP protocol for my application.i'm able to configure my server side but i'm getting error at client(WTP) side as IOCTL error.while running the command
#./WTP /mnt/cf/capwap/
: wlan2
Starting WTP...
# WTP Loads... (0 Replies)
Hi everybody,
i've been googling for ages now and gotten kinda desperate... The question, however, might be rather trivial for the experts: What is it exactly, i.e. physically, the POSIX function (for a file) "lseek" does? Does it trigger some kind of synchronization on disk? Is it just for the... (4 Replies)
Is there any command to take create back up of a file as soon as when it is created?If not is it possible to create something like that? (3 Replies)
Discussion started by: Sindhu R
3 Replies
LEARN ABOUT MINIX
setbuf
SETBUF(3) Library Functions Manual SETBUF(3)NAME
setbuf, setvbuf - assign buffering to a stream
SYNOPSIS
#include <stdio.h>
int setbuf(FILE *stream, char *buf)
int setvbuf(FILE *stream, char *buf, int type, 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 encountered or input is read from stdin. Fflush (see fclose(3))
may be used to force the block out early. Normally all files are block buffered. A buffer is obtained from malloc(3) upon the first getc
or putc(3) on the file. If the standard stream stdout refers to a terminal it is line buffered. The standard stream stderr is always
unbuffered.
Setbuf is used after a stream has been opened but before it is read or written. The character array buf is used instead of an automati-
cally allocated buffer. If buf is the constant pointer NULL, input/output will be completely unbuffered. A manifest constant BUFSIZ tells
how big an array is needed:
char buf[BUFSIZ];
Setvbuf, an alternate form of setbuf, is used after a stream has been opened but before it is read or written. It has three uses, depend-
ing on the value of the type argument:
setvbuf(stream, buf, _IOFBF, size)
Causes input/output to be fully buffered using the character array buf whose size is determined by the size argument. If buf is the
constant pointer NULL, then an automatically allocated buffer will be used.
setvbuf(stream, buf, _IOLBF, size)
Like above, except that output will be line buffered, i.e. the buffer will be flushed when a newline is written, the buffer is full,
or input is requested.
setvbuf(stream, buf, _IONBF, size)
Causes input/output to be completely unbuffered. Buf and size are ignored.
A file can be changed between unbuffered, line buffered, or block buffered by using freopen (see fopen(3)) followed by the appropriate
setvbuf call.
SEE ALSO fopen(3), getc(3), putc(3), malloc(3), fclose(3), puts(3), printf(3), fread(3).
4th Berkeley Distribution May 12, 1986 SETBUF(3)