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Full Discussion: Check EOF char in Unix. OR To check file has been received completely from a remote system
Top Forums UNIX for Advanced & Expert Users Check EOF char in Unix. OR To check file has been received completely from a remote system Post 302439497 by achenle on Thursday 22nd of July 2010 07:48:50 PM
Old 07-22-2010
Quote:
Originally Posted by methyl
Maybe see if they can transfer the file under a temporary name, then they rename the file to the correct name after a complete transfer.
That's one answer that works.

Basically, there's NO WAY you can tell on the receiving machine if the entire file has been transferred successfully.

YOU DO NOT HAVE THAT INFORMATION!!!

(Sorry about the shouting, but too many people think they can "solve" this problem somehow. They CAN'T. It's like solving "a + b = 2" when you don't know either a or b - it's impossible.)

The ONLY way to know that the complete file has been successfully transferred is for the sender to send some signal that the sending is complete.

Renaming the file from a temp name is one very good way to send that signal. Just make sure the rename doesn't move the file from one file system to another.
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LEARN ABOUT MINIX

kill

KILL(2) 							System Calls Manual							   KILL(2)

NAME

       kill - send signal to a process

SYNOPSIS

       #include <sys/types.h>
       #include <signal.h>

       int kill(pid_t pid, int sig)

DESCRIPTION

       Kill  sends  the signal sig to a process, specified by the process number pid.  Sig may be one of the signals specified in sigaction(2), or
       it may be 0, in which case error checking is performed but no signal is actually sent.  This can be used to check the validity of pid.

       The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user.

       If the process number is 0, the signal is sent to all processes in the sender's process group.

       If the process number is -1 and the user is the super-user, the signal is broadcast universally except to init and the process sending  the
       signal.	If the process number is -1 and the user is not the super-user, the signal is broadcast universally to all processes with the same
       uid as the user except the process sending the signal.  No error is returned if any process could be signaled.

       If the process number is negative but not -1, the signal is sent to all processes whose process group ID is equal to the absolute value	of
       the process number.

       Processes may send signals to themselves.

RETURN VALUE

       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       Kill will fail and no signal will be sent if any of the following occur:

       [EINVAL]       Sig is not a valid signal number.

       [ESRCH]	      No process can be found corresponding to that specified by pid.

       [ESRCH]	      The process id was given as 0 but the sending process does not have a process group.

       [EPERM]	      The  sending  process  is not the super-user and its effective user id does not match the effective user-id of the receiving
		      process.	When signaling a process group, this error was returned if any members of the group could not be signaled.

SEE ALSO

       getpid(2), getpgrp(2), sigaction(2), raise(3).

4th Berkeley Distribution					   May 14, 1986 							   KILL(2)
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