Programming :: Check If Buffer Is Empty In C?
Apr 12, 2011Greetings EveryOne
how to check if buffer is empty in c?
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Programming :: How To Check For Empty Variables In PHP
Apr 26, 2010I want to check if a MySQL db query will return an empty result - I first do this:
$query="SELECT * from <whatever" ;
$result=mysql_query($query) ;
$row=mysql_fetch_row($result) ;
Now how do I check if $row is empty or not? Will $row="" do the trick?
Programming :: Check If An Array Is Empty In Perl?
Nov 28, 2008To do this, can I do this?:
if (@ary = ""),
or is something more needed?
Software :: Check For Buffer I/O Errors?
Aug 30, 2010Howto check a hard disk for Buffer I/O Errors and fix them using linux Live CD, without damaging OS?
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Mar 4, 2010Code:
char retBuffer[100];
recv(sock , retBuffer ,sizeof(retBuffer) , 0);
if i send a string smaller then my buffer size retBuffer always have garbage of the end of it....what can i do to eliminate tis problem ?
Programming :: Store A Packet In Buffer?
May 19, 2010writing a code in C program for debugging error and sendingror messagein routingprotocols. please answer with code
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Sep 20, 2010I have been developing some code which I have been testing an another i386 system. However I have been getting some weird data received on a socket I am communicating with some 3rd party hardware, I have opened a socket to read data on the hardware's telnet port. The data being read is as expected and my code appears to function correctly.
However I have now began testing the code on a target platform, this platform is of a better spec than my development system. When I read data from the socket using recv(), all the expected data has not been read.A chunk of data from the beginning is missing and a portion of data that would be at the end is now at the beginning of the buffer. I'll try and illustrate this below.
[Code]...
Programming :: Processor Priority Level For Algorithm For Buffer Allocation
Jan 9, 2010The algorithm for reading and writing disk blocks use the algorithm getblk to allocate buffers from the pool. In the algorithm getblk, if the kernel removes a buffer from the free list, it must raise the processor priority level to block out interrupts before checking the free list. Why ?Where can i find the C implementation of the above algorithm for buffer allocation in the linux source code ?
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Feb 9, 2011create a large buffer in my program so that I can send, and then receive on another pc, more than 4096 bytes (this seems to be the default for the serial port). I thought this might work:
[code]...
Programming :: In Correct File Is Empty?
Jun 17, 2010I am using embedded Linux. File open is successful. The file has all the permissions. It is present in current directory too. The size is about 27KB. But s.st_size says it is zero.
inputFileName = "abc.mp3";
FILE* inFile = NULL;
inFile = fopen(inputFileName, "r+b");
[code]...
Programming :: Delete Folder Not Empty C++?
Dec 5, 2009I'm using rmdir(), and everything goes ok if the directory is empty, ?how can I remove the entire tree when i have other files or directories in the folder that I want to delete?I've read about using "system(rm....)" but i REALLY want to do this without it, is it possible?
View 4 Replies View RelatedProgramming :: Set The Record Separator To An Empty String?
May 4, 2010I tried to find out how awk works with multiline strings. I found this. I hope it will be useful for somebody. 1. I know that awk can searches simple patterns like '/^one/'
Code:
s="one
two
three"
echo $s | awk '/^one/'
2. I know that "Awk can handle multiline records by specifying the field separator to be a newline and set the record separator to an empty string." I've found it here
[Code]....
Programming :: Bash There Will Be Empty Lines At The End Of The File?
Mar 26, 2011Using awk I pull the first field of a random line from my datafile.myvar1=`awk -F" " 'NR=='$randline' {printf "%s", $1}' myfileThis works fine. The problem is there will be empty lines at the end of the file. Rather than using awkto filter out blank lines I would like to figure this out first.So I test $myvar1 for a blank string after setting $randline to one that I know is blank:test -z "$myvar1" && echo "true" || echo "false"But, this returns "false"? So the string is not zero length. Why? It's a tab-separated file. Is awk storing the tab with the $1 field or something.This is where I get headache. I try to echo my variable to see what it looks like.
echo "$myvar1"
outputs: nothing
echo "My variable is [$myvar1]"
outputs: [y variable is [
Why is the closing bracket at the beginning? What character could be stored in $myvar1 that would do such a thing and how did it get there?
Programming :: HOSTNAME Variable Is Being An Empty String
May 19, 2011The script produces 2 empty lines and I don't know why.
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Apr 27, 2010Let say I would like to check /etc/profile whether defined umask 022
umaskcheck=$(What to defined here?)
if [ What to define here? ]
then
[code]....
Programming :: Listing Sudo Users - Getting Empty Space In Between
May 20, 2010I was trying to list sudo users in a Linux Machine,
[root@redhat ~]# grep -v -E '^#' /etc/sudoers
root ALL=(ALL) ALL
%work ALL=(ALL) ALL
%dilipvp ALL=(ALL) ALL
where work is a group and dilipvp is user. Can you help me in creating a better script which can list the members of the group work as well. and why I am getting empty space in between.
Programming :: Check If There Is Such A Value In The Database
Feb 10, 2010sql statement. I am trying to check if there is such a value in the database.
Code:
string NewMovie = "ww";
string queryText ;
queryText = "Select * from movie_info WHERE movie_title = '"+ NewTitle +"'";
MYSQL *conn;
conn=mysql_init(NULL);
mysql_real_connect(conn,host,username,password,database,0,NULL,0);
[Code]......
return 0; The problem i am facing is how do i check if the value is found. I read up and found that a query will return a value of TRUE if the query is a success and a FAIL if there is an error. How do i call these values and then based the check on it?
Programming :: How To Check The Environment
Jul 22, 2011I have written a tiny script for kernel compilation, which call menuconfig and then compile the kernel. It is working fine. Now I like to test my environment and if it is shell menuconfig will be called and if X then xconfig will be called. How can I check the environment then?
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May 25, 2010I need to check if $var is not start with 0
Code:
read var
if [ $var IS NOT START WITH 0 (or something like 006077) ];then echo 'Good'
Programming :: Regular Expression Query - Express Disallowing Empty Brackets "()"
Feb 1, 2011A string can assume the following valid values:"(a, b)" "(a)" "(b)"how I can express this disallowing empty brackets "()"? (I am using Python.)
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Aug 5, 2010I need to find if, in a folder any directories exist, except a certain one named "mes croquis".What I am trying to say, is that the re already is a directory named "my croquis", which I have to ignore. IF any other directory appears, I have to archive them.I got everything so far, except the starting condition.In other terms , I am lookign for something like this:
IF anyDir EXIST AND name != "mes croquis"
do something
else
[code]....
Programming :: Check If The Variable Is A Number Or Not
Apr 30, 2011I've created (as a homework) to create as many folders as told but I still need to check if the variable is a number or not :
Code: #!/bin/sh
echo "Veuillez saisir un nombre"; read nmbr
nmbrf=$nmbr
while [ $nmbrf -gt 0 ]
do mkdir -p "foo$nmbrf"
nmbrf=`expr $nmbrf - 1`
echo "$nmbrf"
how do I check that nmbr is a number or something else?
Programming :: Check Whether The First Character Is TAB Or Space?
May 11, 2011I have a file with one line. I want to check whether the first character is TAB or space, how can i do this.? using "cut" wont as it "bypasses the tab and space characters"
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Mar 25, 2010script that will check if my log file is a certain size? EX: I want to limit the size of my rsync log to say 5MB, if that's true I would move it and create a new one.
View 4 Replies View RelatedProgramming :: C++ Check If Pointer Is Deleted?
Apr 24, 2011Is it possible to check if a pointer is deleted in C++ (using GDB)? For example:
Code:
a = new Thing();
b = a;
delete a;
// If all I have is the variable "b", how can I tell if it was deleted?