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file transfer protocol client - server ppt
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file transfer protocol client - server application

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introduction

file transfer protocol(ftp) is a standardnetwork protocolused to transfer files from onehostto another host over atcp-based network, such as theinternet.
ftp is built on aclient-serverarchitecture and uses separate control and data connections between the client and the server.[1]ftp users may authenticate themselves using aclear-textsign-in protocol, normally in the form of a username and password, but can connect anonymously if the server is configured to allow it. for secure transmission that hides (encrypts) the username and password, and encrypts the content,ssh file transfer protocolmay be used.
the first ftp client applications were interactive command-line tools, implementing standard commands and syntax.graphical user interfaceshave since been developed for many of the popular desktop operating systems in use today,[2][3]including general web design programs likemicrosoft expression web, and specialist ftp clients such ascuteftp.

objectives

the objective of ftp, as outlined by its rfc, are:
to promote sharing of files (computer programs and/or data).
to encourage indirect or implicit use of remote computers.
to shield a user from variations in file storage systems among different hosts.
to transfer data reliably, and efficiently.

scopes

to ensure portability and therefore compatibility.
to ensure our system moves with time i.e. allow for maintenance, upgrades and periodic back up by developed and authorized personnel.
to program the system using the appropriate database design application, platform and programming languages.

child process

achild processin computing is a process created by another process (theparent process).
a child process inherits most of itsattributes, such as openfiles, from its parent. inunix, a child process is infact created (usingfork) as a copy of the parent. the child process can thenoverlay itself with a different program (usingexec) as required.
each process may create many child processes but will have at most one parent process; if a process does not have a parent this usually indicates that it was created directly by thekernel. in some systems, includingunixbased systems such aslinux, the very first process (calledinit) is started by the kernel atbootingtime and never terminates. other parentless processes may be launched to carry out variousdaemontasks inuserspace. another way for a process to end up without a parent is if its parent dies, leaving anorphan process; but in this case it will shortly be adopted by init.

execution of fork()

the fork() function is the primitive for creating a child process that can does something in parallel with the main process
after a fork() the main process splits in two parallel process: a parent and a child processes. both ot them see the fork() return code, but with different values: it returns 0 in the child process and the child's process id in the parent process.
if process creation failed, fork returns a value of -1 in the parent process.
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