一、环境搭建脚本

准备四个文件

install.sh,toolChain_jsonc.cmake,toolChain_libubox.cmake,toolChain_ubus.cmake

toolChain_jsonc.cmake

set(CMAKE_SYSTEM_NAME Linux)
SET(TOOLCHAIN_DIR "/usr")
set(CMAKE_C_COMPILER   ${TOOLCHAIN_DIR}/bin/gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/g++)
set(CMAKE_FIND_ROOT_PATH "/home/yyh/ubus_libs/json-c")
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

toolChain_libubox.cmake

set(CMAKE_SYSTEM_NAME Linux)
SET(TOOLCHAIN_DIR "/usr")
set(CMAKE_C_COMPILER   ${TOOLCHAIN_DIR}/bin/gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/g++)
set(INSTALL_PATH "/home/yyh/ubus_libs/install_build_ubuntu")

include_directories(${INSTALL_PATH}/include)
include_directories(${INSTALL_PATH}/include/json-c)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

set(CMAKE_FIND_ROOT_PATH "/home/yyh/ubus_libs/ubox") # or libubox
set(json "/home/yyh/ubus_libs/install_build_ubuntu/lib/libjson-c.so")

toolChain_ubus.cmake

set(CMAKE_SYSTEM_NAME Linux)
SET(TOOLCHAIN_DIR "/usr")
set(CMAKE_C_COMPILER   ${TOOLCHAIN_DIR}/bin/gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/g++)


set(INSTALL_PATH "/home/yyh/ubus_libs/install_build_ubuntu")
include_directories(${INSTALL_PATH}/include)
set(CMAKE_FIND_ROOT_PATH "/home/yyh/ubus_libs/ubus" $(INSTALL_PATH)) 
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

set(blob_library     ${INSTALL_PATH}/lib/libblobmsg_json.so)
set(json             ${INSTALL_PATH}/lib/libjson-c.so)
set(ubox_include_dir ${INSTALL_PATH}/include/libubox)
set(ubox_library     ${INSTALL_PATH}/lib/libubox.so)

install.sh

#!/bin/bash
# @Author: yyh
# @Date:   2023-03-08 13:32:27
# @Last Modified by:   yyh
# @Last Modified time: 2023-03-08 17:09:22

LIBS_DIR=/home/yyh/ubus_libs

LIB_LIBUBOX_DIR=libubox
LIB_UBUS_DIR=ubus
LIB_JSONC_DIR=json-c

COMPILE_EV=install_build_ubuntu

if [[ $1 = "git_libs" ]]; then
	mkdir $LIBS_DIR -p
	cd $LIBS_DIR
    git clone https://github.com/json-c/json-c.git
    git clone http://git.openwrt.org/project/libubox.git
    git clone https://git.openwrt.org/project/ubus.git
fi

if [[ $1 = "compile_lib" ]]; then

    cp *.cmake $LIBS_DIR
    cd $LIBS_DIR
    mkdir ${LIBS_DIR}/${COMPILE_EV} -p
	
    cd ${LIBS_DIR}/$LIB_JSONC_DIR
    cmake -DCMAKE_INSTALL_PREFIX=${LIBS_DIR}/${COMPILE_EV} -DCMAKE_TOOLCHAIN_FILE=${LIBS_DIR}/toolChain_jsonc.cmake .
    # cmake -DCMAKE_INSTALL_PREFIX=/home/yyh/ubus_libs/install_build_ubuntu -DCMAKE_TOOLCHAIN_FILE=/home/yyh/ubus_libs/toolChain_jsonc.cmake .
    make
    sudo make install
    sudo ldconfig -v

    
    cd ${LIBS_DIR}/$LIB_LIBUBOX_DIR
    cmake -DBUILD_LUA=OFF -DCMAKE_INSTALL_PREFIX=${LIBS_DIR}/${COMPILE_EV} -DCMAKE_TOOLCHAIN_FILE=${LIBS_DIR}/toolChain_libubox.cmake .
    # cmake -DCMAKE_INSTALL_PREFIX=/home/yyh/ubus_libs/install_build_ubuntu -DCMAKE_TOOLCHAIN_FILE=/home/yyh/ubus_libs/toolChain_libubox.cmake .
    make
    sudo make install


    cd ${LIBS_DIR}/$LIB_UBUS_DIR
    cmake -DBUILD_LUA=OFF -DCMAKE_INSTALL_PREFIX=${LIBS_DIR}/${COMPILE_EV} -DCMAKE_TOOLCHAIN_FILE=${LIBS_DIR}/toolChain_ubus.cmake .
    #cmake -DCMAKE_INSTALL_PREFIX=/home/yyh/ubus_libs/install_build_ubuntu -DCMAKE_TOOLCHAIN_FILE=/home/yyh/ubus_libs/toolChain_ubus.cmake .
    make
    sudo make install

fi

二、测试

安装相关库

sudo apt-get install libjsoncpp-dev 
sudo apt-get install zmap
sudo apt-get install autoconf automake libtool
sudo apt install lua5.1

chmod +x ./install.sh
./install.sh git_libs
./install compile_lib

出现问题：

/home/yyh/ubus_libs/libubox/blobmsg_json.c:23:11: fatal error: json/json.h: 没有那个文件或目录
   23 |  #include <json/json.h>
      |           ^~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/blobmsg_json.dir/build.make:63：CMakeFiles/blobmsg_json.dir/blobmsg_json.c.o] 错误 1
make[1]: *** [CMakeFiles/Makefile2:211：CMakeFiles/blobmsg_json.dir/all] 错误 2
make: *** [Makefile:130：all] 错误 2


解决：
sudo cp  /home/yyh/ubus_libs/install_build_ubuntu/include/json-c /home/yyh/ubus_libs/install_build_ubuntu/include/json	 -rf

三、测试uloop

makefile

CC = gcc
CFLAGS = -I./include -L./lib  -lubox -lubus#-lblobmsg_json -ljson_script -ljson-c  
TARGET = main_ubuntu

all:
    $(CC) -o $(TARGET) main.c $(CFLAGS)

.PHONY:clean
clean:
    rm -rf *.o $(TARGET)

main.c 每5s打印信息

/*
* @Author: yyh
* @Date:   2023-03-08 17:17:35
* @Last Modified by:   yyh
* @Last Modified time: 2023-03-08 17:40:41
*/
/*
typedef void (*uloop_timeout_handler)(struct uloop_timeout *t);
struct uloop_timeout
{
    struct list_head list;
    bool pending;

    uloop_timeout_handler cb;
    struct timeval time;
};
*/

#include <stdio.h>
#include "./libubox/uloop.h"

static void timeout_handler(struct uloop_timeout *timeout)
{
    printf("(hello world)\n");
}

static struct uloop_timeout timer = {
    .cb = timeout_handler,
};

int main(int args, char *argv[])
{
    uloop_init();
    uloop_timeout_set(&timer, 5000);    // 5s
    uloop_run();
    return 0;
}