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include(CheckCSourceCompiles)
# - check_nonblocking_socket_support()
#
# Check for how to set a socket to non-blocking state. There seems to exist
# four known different ways, with the one used almost everywhere being POSIX
# and XPG3, while the other different ways for different systems (old BSD,
# Windows and Amiga).
#
# One of the following variables will be set indicating the supported
# method (if any):
# HAVE_O_NONBLOCK
# HAVE_FIONBIO
# HAVE_IOCTLSOCKET
# HAVE_IOCTLSOCKET_CASE
# HAVE_SO_NONBLOCK
# HAVE_DISABLED_NONBLOCKING
#
# The following variables may be set before calling this macro to
# modify the way the check is run:
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
#
macro(check_nonblocking_socket_support)
# There are two known platforms (AIX 3.x and SunOS 4.1.x) where the
# O_NONBLOCK define is found but does not work.
check_c_source_compiles("
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#if defined(sun) || defined(__sun__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
# if defined(__SVR4) || defined(__srv4__)
# define PLATFORM_SOLARIS
# else
# define PLATFORM_SUNOS4
# endif
#endif
#if (defined(_AIX) || defined(__xlC__)) && !defined(_AIX41)
# define PLATFORM_AIX_V3
#endif
#if defined(PLATFORM_SUNOS4) || defined(PLATFORM_AIX_V3) || defined(__BEOS__)
#error \"O_NONBLOCK does not work on this platform\"
#endif
int main()
{
int socket;
int flags = fcntl(socket, F_SETFL, flags | O_NONBLOCK);
}"
HAVE_O_NONBLOCK)
if(NOT HAVE_O_NONBLOCK)
check_c_source_compiles("/* FIONBIO test (old-style unix) */
#include <unistd.h>
#include <stropts.h>
int main()
{
int socket;
int flags = ioctl(socket, FIONBIO, &flags);
}"
HAVE_FIONBIO)
if(NOT HAVE_FIONBIO)
check_c_source_compiles("/* ioctlsocket test (Windows) */
#undef inline
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock2.h>
int main()
{
SOCKET sd;
unsigned long flags = 0;
sd = socket(0, 0, 0);
ioctlsocket(sd, FIONBIO, &flags);
}"
HAVE_IOCTLSOCKET)
if(NOT HAVE_IOCTLSOCKET)
check_c_source_compiles("/* IoctlSocket test (Amiga?) */
#include <sys/ioctl.h>
int main()
{
int socket;
int flags = IoctlSocket(socket, FIONBIO, (long)1);
}"
HAVE_IOCTLSOCKET_CASE)
if(NOT HAVE_IOCTLSOCKET_CASE)
check_c_source_compiles("/* SO_NONBLOCK test (BeOS) */
#include <socket.h>
int main()
{
long b = 1;
int socket;
int flags = setsockopt(socket, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b));
}"
HAVE_SO_NONBLOCK)
if(NOT HAVE_SO_NONBLOCK)
# No non-blocking socket method found
set(HAVE_DISABLED_NONBLOCKING 1)
endif()
endif()
endif()
endif()
endif()
endmacro()
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