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/* assuan-io.c - Wraps the read and write functions.
Copyright (C) 2002, 2004, 2006-2009 Free Software Foundation, Inc.
This file is part of Assuan.
Assuan is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
Assuan 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#include <unistd.h>
#include <errno.h>
#ifdef HAVE_W32_SYSTEM
# include <windows.h>
#else
# include <sys/wait.h>
#endif
#include "assuan-defs.h"
#ifndef HAVE_W32_SYSTEM
pid_t
_assuan_waitpid (pid_t pid, int *status, int options)
{
return waitpid (pid, status, options);
}
#endif
static ssize_t
do_io_read (assuan_fd_t fd, void *buffer, size_t size)
{
#ifdef HAVE_W32_SYSTEM
/* Due to the peculiarities of the W32 API we can't use read for a
network socket and thus we try to use recv first and fallback to
read if recv detects that it is not a network socket. */
int n;
n = recv (HANDLE2SOCKET(fd), buffer, size, 0);
if (n == -1)
{
switch (WSAGetLastError ())
{
case WSAENOTSOCK:
{
DWORD nread = 0;
n = ReadFile (fd, buffer, size, &nread, NULL);
if (!n)
{
switch (GetLastError())
{
case ERROR_BROKEN_PIPE: errno = EPIPE; break;
default: errno = EIO;
}
n = -1;
}
else
n = (int)nread;
}
break;
case WSAEWOULDBLOCK: errno = EAGAIN; break;
case ERROR_BROKEN_PIPE: errno = EPIPE; break;
default: errno = EIO; break;
}
}
return n;
#else /*!HAVE_W32_SYSTEM*/
return read (fd, buffer, size);
#endif /*!HAVE_W32_SYSTEM*/
}
ssize_t
_assuan_io_read (assuan_fd_t fd, void *buffer, size_t size)
{
return do_io_read (fd, buffer, size);
}
ssize_t
_assuan_simple_read (assuan_context_t ctx, void *buffer, size_t size)
{
return do_io_read (ctx->inbound.fd, buffer, size);
}
static ssize_t
do_io_write (assuan_fd_t fd, const void *buffer, size_t size)
{
#ifdef HAVE_W32_SYSTEM
/* Due to the peculiarities of the W32 API we can't use write for a
network socket and thus we try to use send first and fallback to
write if send detects that it is not a network socket. */
int n;
n = send (HANDLE2SOCKET(fd), buffer, size, 0);
if (n == -1 && WSAGetLastError () == WSAENOTSOCK)
{
DWORD nwrite;
n = WriteFile (fd, buffer, size, &nwrite, NULL);
if (!n)
{
switch (GetLastError ())
{
case ERROR_BROKEN_PIPE:
case ERROR_NO_DATA: errno = EPIPE; break;
default: errno = EIO; break;
}
n = -1;
}
else
n = (int)nwrite;
}
return n;
#else /*!HAVE_W32_SYSTEM*/
return write (fd, buffer, size);
#endif /*!HAVE_W32_SYSTEM*/
}
ssize_t
_assuan_io_write (assuan_fd_t fd, const void *buffer, size_t size)
{
return do_io_write (fd, buffer, size);
}
ssize_t
_assuan_simple_write (assuan_context_t ctx, const void *buffer, size_t size)
{
return do_io_write (ctx->outbound.fd, buffer, size);
}
#ifdef HAVE_W32_SYSTEM
int
_assuan_simple_sendmsg (assuan_context_t ctx, void *msg)
#else
ssize_t
_assuan_simple_sendmsg (assuan_context_t ctx, struct msghdr *msg)
#endif
{
#ifdef HAVE_W32_SYSTEM
errno = ENOSYS;
return -1;
#else
int ret;
while ( (ret = sendmsg (ctx->outbound.fd, msg, 0)) == -1 && errno == EINTR)
;
return ret;
#endif
}
#ifdef HAVE_W32_SYSTEM
int
_assuan_simple_recvmsg (assuan_context_t ctx, void *msg)
#else
ssize_t
_assuan_simple_recvmsg (assuan_context_t ctx, struct msghdr *msg)
#endif
{
#ifdef HAVE_W32_SYSTEM
errno = ENOSYS;
return -1;
#else
int ret;
while ( (ret = recvmsg (ctx->inbound.fd, msg, 0)) == -1 && errno == EINTR)
;
return ret;
#endif
}
void
_assuan_usleep (unsigned int usec)
{
if (usec)
{
#ifdef HAVE_NANOSLEEP
struct timespec req;
struct timespec rem;
req.tv_sec = 0;
req.tv_nsec = usec * 1000;
while (nanosleep (&req, &rem) < 0 && errno == EINTR)
req = rem;
#elif defined(HAVE_W32_SYSTEM)
Sleep (usec / 1000);
#else
struct timeval tv;
tv.tv_sec = usec / 1000000;
tv.tv_usec = usec % 1000000;
select (0, NULL, NULL, NULL, &tv);
#endif
}
}
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