efl

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/**
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   Compile with gcc -o ecore_exe_example ecore_exe_example.c `pkg-config --cflags --libs ecore`
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 */
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#include <stdio.h>
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#include <string.h>
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#include <Ecore.h>
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#define BUFFER_SIZE 1024
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static Eina_Bool
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_msg_from_child_handler(void *data EINA_UNUSED, int type EINA_UNUSED, void *event)
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{
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   Ecore_Exe_Event_Data *dataFromProcess = (Ecore_Exe_Event_Data *)event;
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   char msg[BUFFER_SIZE];
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   if (dataFromProcess->size >= (BUFFER_SIZE - 1))
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     {
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        printf("Data too big for bugger. error\n");
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        return ECORE_CALLBACK_DONE;
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     }
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   strncpy(msg, dataFromProcess->data, dataFromProcess->size);
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   msg[dataFromProcess->size] = 0;
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   if (strcmp(msg, "quit") == 0)
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     {
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        printf("My child said to me, QUIT!\n");
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        ecore_main_loop_quit();
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     }
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   else
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     printf("I received a message from my child: %s\n", msg);
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   return ECORE_CALLBACK_DONE;
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}
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static Eina_Bool
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_sendMessage(void *data)
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{
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   static int numberOfMessages = 0;
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   Ecore_Exe *childHandle = (Ecore_Exe *)data;
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   char msg[BUFFER_SIZE];
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   sprintf(msg, " Message: %d\n", numberOfMessages);
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   numberOfMessages++;
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   if (ecore_exe_send(childHandle, msg, strlen(msg)) != EINA_TRUE)
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     fprintf(stderr, "Could not send my name to the child\n");
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   else
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     printf(
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             "I'm the father and I sent this message to the child: %s\n", msg);
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   return ECORE_CALLBACK_RENEW;
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}
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int
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main(void)
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{
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   pid_t childPid;
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   Ecore_Exe *childHandle;
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   if (!ecore_init())
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     goto exit;
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   childHandle = ecore_exe_pipe_run("./ecore_exe_example_child",
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                                    ECORE_EXE_PIPE_WRITE |
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                                    ECORE_EXE_PIPE_READ_LINE_BUFFERED |
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                                    ECORE_EXE_PIPE_READ, NULL);
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   if (childHandle == NULL)
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     {
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        fprintf(stderr, "Could not create a child process!\n");
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        goto ecore_shutdown;
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     }
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   childPid = ecore_exe_pid_get(childHandle);
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   if (childPid == -1)
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     fprintf(stderr, "Could not retrieve the PID!\n");
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   else
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     printf("The child process has PID:%u\n", (unsigned int)childPid);
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   ecore_event_handler_add(ECORE_EXE_EVENT_DATA, _msg_from_child_handler, NULL);
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   ecore_timer_add(1, _sendMessage, childHandle);
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   ecore_main_loop_begin();
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   ecore_exe_free(childHandle); //This will not affect the child process
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   ecore_shutdown();
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   return EXIT_SUCCESS;
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ecore_shutdown:
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   ecore_shutdown();
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exit:
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   return EXIT_FAILURE;
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}
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