Store file into a buffer to send it through a socket Post: 302347809

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Top Forums Programming Store file into a buffer to send it through a socket Post 302347809 by Corona688 on Wednesday 26th of August 2009 12:36:15 PM

08-26-2009

Registered User

Oh, if you're using stdio anyway, you might as well try this so as to include a few dozen less headers:

Code:

#include <stdio.h>

int main(void)
{
  size_t bytes;
  char buf[512];
  FILE *fp=fopen("filename", "rb");
  if(fp == NULL)
  {
    fprintf(stderr, "Couldn't open file\n");
    return(1);
  }

  bytes=fread(buf, 1, 512, fp);
  if(bytes <= 0)
  {
    fprintf(stderr, "Couldn't read from file\n");
    fclose(fp);
    return(2);
  }
  fclose(fp);
  fprintf(stderr, "Read %d bytes into buffer\n", bytes);


  return(0);
}

sendfile() is more efficient in some circumstances, but is also 100% linux-specific and nonportable, as well as subject to certain limitations -- the data source must be a file, and the destination must be a socket. It used to be less arbitrary, leading to a few bits of new code taking advantage of it breaking when this behavior was changed. I'm not sure if it behaves the same with all sockets or not, particularly raw sockets which as I understand it must be packet-based.

Last edited by Corona688; 08-26-2009 at 01:57 PM.. Reason: fclose can happen sooner

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LEARN ABOUT PHP

socket_set_block

SOCKET_SET_BLOCK(3)							 1						       SOCKET_SET_BLOCK(3)

socket_set_block - Sets blocking mode on a socket resource

SYNOPSIS

       bool socket_set_block (resource	$socket)

DESCRIPTION

	The socket_set_block(3) function removes the O_NONBLOCK flag on the socket specified by the $socket parameter.

	When  an operation (e.g. receive, send, connect, accept, ...) is performed on a blocking socket, the script will pause its execution until
       it receives a signal or it can perform the operation.

PARAMETERS

	      o $socket
		- A valid socket resource created with socket_create(3) or socket_accept(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      socket_set_block(3) example

	      <?php
	      $socket = socket_create_listen(1223);
	      socket_set_block($socket);

	      socket_accept($socket);
	      ?>

	       This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_BLOCK mode.  socket_accept(3)  will
	      hang until there is a connection to accept.

SEE ALSO

       socket_set_nonblock(3), socket_set_option(3).

PHP Documentation Group 												       SOCKET_SET_BLOCK(3)

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