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Full Discussion: Write-Write on a socket
Top Forums Programming Write-Write on a socket Post 302446409 by gendaox on Wednesday 18th of August 2010 02:49:21 PM
Old 08-18-2010
Write-Write on a socket

Can anyone tell what happens if each end writes at the same time on the same socket ?
- if one of them issues a read() after write() has completed, will it record into the buffer what the other sent ?

ex.
e1 writes to e2 - - - while - - - e2 writes to e1 (at the same time)

e1 read () - what will he read ?
 

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SOCKET_WRITE(3) 							 1							   SOCKET_WRITE(3)

socket_write - Write to a socket

SYNOPSIS
int socket_write (resource $socket, string $buffer, [int $length]) DESCRIPTION
The function socket_write(3) writes to the $socket from the given $buffer. PARAMETERS
o $socket - o $buffer - The buffer to be written. o $length - The optional parameter $length can specify an alternate length of bytes written to the socket. If this length is greater than the buffer length, it is silently truncated to the length of the buffer. RETURN VALUES
Returns the number of bytes successfully written to the socket or FALSE on failure. The error code can be retrieved with socket_last_error(3). This code may be passed to socket_strerror(3) to get a textual explanation of the error. Note It is perfectly valid for socket_write(3) to return zero which means no bytes have been written. Be sure to use the === operator to check for FALSE in case of an error. NOTES
Note socket_write(3) does not necessarily write all bytes from the given buffer. It's valid that, depending on the network buffers etc., only a certain amount of data, even one byte, is written though your buffer is greater. You have to watch out so you don't uninten- tionally forget to transmit the rest of your data. SEE ALSO
socket_accept(3), socket_bind(3), socket_connect(3), socket_listen(3), socket_read(3), socket_strerror(3). PHP Documentation Group SOCKET_WRITE(3)
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