lib: introduce uloop binding

The uloop module allows controlling the uloop event loop and supports adding
timeouts, processes and file descriptors.

Example:

    #!ucode -RS

    let fs = require("fs");
    let uloop = require("uloop");

    let fd1 = fs.popen("echo 1; sleep 1; echo 2; sleep 1; echo 3", "r");
    let fd2 = fs.popen("echo 4; sleep 1; echo 5; sleep 1; echo 6", "r");

    function fd_read_callback(flags) {
    	if (flags & uloop.ULOOP_READ) {
    		let line = this.handle().read("line");

    		printf("Line from fd <%s/%d>: <%s>\n",
    			this, this.fileno(),
    			trim(line));

    	}
    }

    uloop.init();

    uloop.timer(1500, function() {
    	printf("Timeout after 1500ms\n");
    });

    uloop.handle(fd1, fd_read_callback, uloop.ULOOP_READ);
    uloop.handle(fd2, fd_read_callback, uloop.ULOOP_READ);

    uloop.process("date", [ "+%s" ], { LC_ALL: "C" }, function(exitcode) {
    	printf("Date command exited with code %d\n", exitcode);
    });

    uloop.run();

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 17 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c84fc3..8e7322c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,6 +27,7 @@ OPTION(RTNL_SUPPORT "Route Netlink plugin support" ON)
 OPTION(NL80211_SUPPORT "Wireless Netlink plugin support" ON)
 OPTION(RESOLV_SUPPORT "NS resolve plugin support" ON)
 OPTION(STRUCT_SUPPORT "Struct plugin support" ON)
+OPTION(ULOOP_SUPPORT "Uloop plugin support" ON)
 
 SET(LIB_SEARCH_PATH "${CMAKE_INSTALL_PREFIX}/lib/ucode/*.so:${CMAKE_INSTALL_PREFIX}/share/ucode/*.uc:./*.so:./*.uc" CACHE STRING "Default library search path")
 STRING(REPLACE ":" "\", \"" LIB_SEARCH_DEFINE "${LIB_SEARCH_PATH}")
@@ -167,6 +168,22 @@ IF(STRUCT_SUPPORT)
   ENDIF()
 ENDIF()
 
+IF(ULOOP_SUPPORT)
+  FIND_LIBRARY(ubox NAMES ubox)
+  FIND_PATH(uloop_include_dir NAMES libubox/uloop.h)
+  INCLUDE_DIRECTORIES(${uloop_include_dir})
+  SET(LIBRARIES ${LIBRARIES} uloop_lib)
+  ADD_LIBRARY(uloop_lib MODULE lib/uloop.c)
+  SET_TARGET_PROPERTIES(uloop_lib PROPERTIES OUTPUT_NAME uloop PREFIX "")
+  SET(CMAKE_REQUIRED_LIBRARIES ubox)
+  CHECK_FUNCTION_EXISTS(uloop_timeout_remaining64 REMAINING64_FUNCTION_EXISTS)
+  UNSET(CMAKE_REQUIRED_LIBRARIES)
+  IF (REMAINING64_FUNCTION_EXISTS)
+    TARGET_COMPILE_DEFINITIONS(uloop_lib PUBLIC HAVE_ULOOP_TIMEOUT_REMAINING64)
+  ENDIF()
+  TARGET_LINK_LIBRARIES(uloop_lib ${ubox})
+ENDIF()
+
 IF(UNIT_TESTING)
   ENABLE_TESTING()
   ADD_DEFINITIONS(-DUNIT_TESTING)