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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2001, 2004, 2007, 2010-2012 Free Software
Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
/* This is an example program to illustrate the use of stream functions.
It connects to a remote HTTP server and prints the contents of its
index page */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <mailutils/mailutils.h>
char wbuf[1024];
char rbuf[1024];
size_t io_timeout = 3;
size_t io_attempts = 3;
int
http_stream_wait (mu_stream_t stream, int flags, size_t *attempt)
{
int rc;
int oflags = flags;
struct timeval tv;
while (*attempt < io_attempts)
{
tv.tv_sec = io_timeout;
tv.tv_usec = 0;
rc = mu_stream_wait (stream, &oflags, &tv);
switch (rc)
{
case 0:
if (flags & oflags)
return 0;
/* FALLTHROUGH */
case EAGAIN:
case EINPROGRESS:
++*attempt;
continue;
default:
return rc;
}
}
return ETIMEDOUT;
}
int
main (int argc, char **argv)
{
int ret;
mu_stream_t stream;
size_t nb, size;
size_t attempt;
char *url = "www.gnu.org";
if (argc > 3)
{
fprintf (stderr, "usage: %s [hostname [url]]\n", argv[0]);
exit (1);
}
if (argc > 1)
url = argv[1];
snprintf (wbuf, sizeof wbuf, "GET %s HTTP/1.0\r\n\r\n",
argc == 3 ? argv[2] : "/");
ret = mu_tcp_stream_create (&stream, url, 80, MU_STREAM_NONBLOCK);
if (ret != 0 && !(ret == EAGAIN || ret == EINPROGRESS))
{
mu_error ("mu_tcp_stream_create: %s", mu_strerror (ret));
exit (EXIT_FAILURE);
}
for (attempt = 0; ret; )
{
if ((ret == EAGAIN || ret == EINPROGRESS) && attempt < io_attempts)
{
ret = http_stream_wait(stream, MU_STREAM_READY_WR, &attempt);
if (ret == 0)
{
ret = mu_stream_open (stream);
continue;
}
}
mu_error ("mu_stream_open: %s", mu_strerror (ret));
exit (EXIT_FAILURE);
}
for (attempt = 0, size = strlen (wbuf);; )
{
ret = mu_stream_write (stream, wbuf, strlen (wbuf), NULL);
if (ret == 0)
break;
else if (ret == EAGAIN)
{
if (attempt < io_attempts)
{
ret = http_stream_wait (stream, MU_STREAM_READY_WR, &attempt);
if (ret)
{
mu_error ("http_wait failed: %s", mu_strerror (ret));
return -1;
}
continue;
}
else
{
mu_error ("mu_stream_write timed out");
exit (EXIT_FAILURE);
}
}
else
{
mu_error ("mu_stream_write: %s", mu_strerror (ret));
exit (EXIT_FAILURE);
}
}
attempt = 0;
for (;;)
{
ret = mu_stream_read (stream, rbuf, sizeof (rbuf), &nb);
if (ret == 0)
{
if (nb == 0)
break;
write (1, rbuf, nb);
}
else if (ret == EAGAIN)
{
if (attempt < io_attempts)
{
ret = http_stream_wait (stream, MU_STREAM_READY_RD, &attempt);
if (ret)
{
mu_error ("http_stream_wait failed: %s", mu_strerror (ret));
exit (EXIT_FAILURE);
}
}
else
{
mu_error ("mu_stream_read: %s", mu_strerror (ret));
exit (EXIT_FAILURE);
}
}
}
ret = mu_stream_close (stream);
if (ret != 0)
{
mu_error ("mu_stream_close: %s", mu_strerror (ret));
exit (EXIT_FAILURE);
}
mu_stream_destroy (&stream);
exit (EXIT_SUCCESS);
}
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