CTI-Demo

# directory
cd /usr/src/freeswitch/libs/esl

# compile
gcc -o testclient testclient.c -pthread -lm -lesl -lcjson -Isrc/include
#

compile

gcc -o testclient testclient.c -pthread -lm -lesl -L. -Isrc/include

https://freeswitch.org/confluence/display/FREESWITCH/Event+Socket+Library
https://blog.csdn.net/huoyin/article/details/39394189

Errors

gcc -o testserver testserver.c -lpthread -lm -lesl -lcjson -Isrc/include

admin~: gcc -o testserver testserver.c -lpthread -lm -lesl -lcjson -Isrc/include

//usr/local/lib/libesl.so: undefined reference to `pthread_mutexattr_settype'
//usr/local/lib/libesl.so: undefined reference to `pthread_attr_setstacksize'
//usr/local/lib/libesl.so: undefined reference to `pthread_mutex_trylock'
//usr/local/lib/libesl.so: undefined reference to `pthread_create'
//usr/local/lib/libesl.so: undefined reference to `pthread_mutexattr_init'
//usr/local/lib/libesl.so: undefined reference to `pthread_mutexattr_destroy'
collect2: error: ld returned 1 exit status

# solution
-lpthread change to -pthread

https://stackoverflow.com/questions/22180354/why-am-i-getting-undefined-reference-to-pthread-mutexattr-settype

/usr/bin/ld: cannot find -lesl

# errors
gcc -o testserver testserver.c -lpthread -lm -lesl -lcjson -Isrc/include
/usr/bin/ld: cannot find -lesl
collect2: error: ld returned 1 exit status

# solution
gcc -fPIC -g -c -Wall esl.c -Isrc/include
gcc -fPIC -g -c -Wall esl_buffer.c -Isrc/include
gcc -fPIC -g -c -Wall esl_config.c -Isrc/include
gcc -fPIC -g -c -Wall esl_event.c -Isrc/include
gcc -fPIC -g -c -Wall esl_json.c -Isrc/include
gcc -fPIC -g -c -Wall esl_threadmutex.c -Isrc/include

gcc -shared -Wl,-soname,libesl.so.1 -o libesl.so.1.0.1 esl_buffer.o esl.o esl_config.o esl_event.o esl_json.o esl_threadmutex.o -lm 
# [-lm must be at the end of the line]

cp -p /usr/src/freeswitch/libs/esl/src/libesl.so.1.0.1 /usr/local/lib  
ln -s /usr/src/freeswitch/libs/esl/src/libesl.so.1.0.1 /usr/local  /lib/libesl.so.1
ln -s /usr/src/freeswitch/libs/esl/src/libesl.so.1 /usr/local/lib/libesl.so

echco '/usr/local/lib' > /etc/ld.conf.d/libesl.conf

# run ldconfig
ldconfig

https://stackoverflow.com/questions/28205692/freeswitch-esl-cannot-find-lesl

/usr/bin/ld: cannot find -lcjson

# error
/usr/bin/ld: cannot find -lcjson
collect2: error: ld returned 1 exit status

# solution
git clone https://github.com/DaveGamble/cJSON.git
cd cJSON/

make && make install

# run ldconfig
ldconfig