I/O on File Post: 302405718

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Top Forums Programming I/O on File Post 302405718 by italian_boy on Friday 19th of March 2010 05:47:59 PM

03-19-2010

Registered User

I/O on File

Hello everybody... In my client - server application I decided to save user name and password in a file by the system call creat(), write().

Code:

 recv(i,buf,sizeof(buf),0);
             result=write(ds_user,buf,sizeof(buf));
                          if (result==-1){
                              printf("error on write");
                              exit(1);
                            }

Now there is a problem in the client-autentication and the next registration-autentication becouse I don't know very well how to manage the file:
This is the autentication code but it's not work

Code:

recv(i,buf,sizeof(buf),0);
char buffer[40];
result1=(ds_user,buffer,40);
printf("%s",buffer);
if (result1==-1){
   printf("error on read");
   exit(1);
 }
   if (strcmp(buf,buffer)==0){
    send(i,"/ok",MAX,0);

where the problem?? is there someone that has got some good example with I/O file?? For example if I want to start reading or writing not at the begin but for example in the middle of the file or in the second row or at the fifth word???
Thank you very much!

italian_boy

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ftpusers

FTPUSERS(5)						     Linux Programmer's Manual						       FTPUSERS(5)

NAME

       ftpusers - list of users that may not log in via the FTP daemon

DESCRIPTION

       The  text  file	ftpusers  contains a list of users that may not log in using the File Transfer Protocol (FTP) server daemon.  This file is
       used not merely for system administration purposes but for improving security within a TCP/IP networked	environment.   It  will  typically
       contain	a  list  of  the  users that either have no business using ftp or have too many privileges to be allowed to log in through the FTP
       server daemon.  Such users usually include root, daemon, bin, uucp, and news.  If your FTP server daemon doesn't use ftpusers  then  it	is
       suggested  that	you  read  its	documentation  to find out how to block access for certain users.  Washington University FTP server Daemon
       (wuftpd) and Professional FTP Daemon (proftpd) are known to make use of ftpusers.

   Format
       The format of ftpusers is very simple.  There is one account name (or username) per line.  Lines starting with a # are ignored.

FILES

       /etc/ftpusers

SEE ALSO

       passwd(5), proftpd(8), wuftpd(8)

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2000-08-27							       FTPUSERS(5)