LCOV - code coverage report
Current view: top level - src/bindings/io/ev/example - exampleio_ev.c (source / functions) Hit Total Coverage
Test: coverage-filtered.info Lines: 0 46 0.0 %
Date: 2019-09-12 12:28:41 Functions: 0 5 0.0 %

          Line data    Source code
       1             : /**
       2             :  * @file
       3             :  *
       4             :  * @brief Example program for io_ev binding.
       5             :  *
       6             :  * @copyright BSD License (see LICENSE.md or https://www.libelektra.org)
       7             :  *
       8             :  * For an example of how I/O bindings are used please see src/libs/notification/example.
       9             :  *
      10             :  * This example uses two I/O operations:
      11             :  * - The "input" operation is a file descriptor watcher that waits for
      12             :  *   STDIN_FILENO (stdin) to become readable.
      13             :  *   Since input is buffered, this typically happens when the user enters some
      14             :  *   text and presses return.
      15             :  *   In practice code using the I/O binding will attach non-blocking file
      16             :  *   descriptors (e.g. from sockets).
      17             :  * - The "output" operation is a timer that prints the last read data every
      18             :  *   second.
      19             :  *
      20             :  */
      21             : #include <errno.h>  // error handling
      22             : #include <stdio.h>  // printf
      23             : #include <string.h> // memset & memcpy
      24             : #include <unistd.h> // file descriptor numbers (STDIN_FILENO)
      25             : 
      26             : #include <kdbassert.h> // assertions (ELEKTRA_NOT_NULL)
      27             : #include <kdbhelper.h> // malloc & free
      28             : #include <kdbio.h>     // I/O binding functions (elektraIo*)
      29             : #include <kdbio/ev.h>  // I/O binding constructor for ev (elektraIoEvNew)
      30             : 
      31             : #include <ev.h> // ev functions
      32             : 
      33             : #define BUFFER_LENGTH 255
      34             : #define ONE_SECOND 1000
      35             : 
      36             : ElektraIoInterface * binding;
      37             : ElektraIoFdOperation * input;
      38             : ElektraIoTimerOperation * output;
      39             : 
      40           0 : int min (int a, int b)
      41             : {
      42           0 :         return (a > b) ? b : a;
      43             : }
      44             : 
      45           0 : void stopLoop (void)
      46             : {
      47             :         // Cleanup
      48           0 :         elektraIoBindingRemoveFd (input);
      49           0 :         elektraIoBindingRemoveTimer (output);
      50           0 :         elektraFree (input);
      51           0 :         elektraFree (output);
      52           0 :         elektraIoBindingCleanup (binding);
      53             : 
      54           0 :         ev_break (EV_DEFAULT, EVBREAK_ONE);
      55           0 : }
      56             : 
      57           0 : void readText (ElektraIoFdOperation * fdOp, int flags ELEKTRA_UNUSED)
      58             : {
      59           0 :         printf ("input: file descriptor became readable\n");
      60             : 
      61           0 :         char * lastInput = elektraIoFdGetData (fdOp);
      62           0 :         ELEKTRA_NOT_NULL (lastInput);
      63             : 
      64             :         char buffer[BUFFER_LENGTH];
      65           0 :         int bytesRead = read (elektraIoFdGetFd (fdOp), &buffer, BUFFER_LENGTH);
      66           0 :         if (bytesRead != -1)
      67             :         {
      68             :                 // make sure there is a null terminator in buffer
      69           0 :                 buffer[min (BUFFER_LENGTH - 1, bytesRead + 1)] = 0;
      70             :                 // remove newline from string
      71           0 :                 buffer[strcspn (buffer, "\r\n")] = 0;
      72             :                 // copy to lastInput
      73           0 :                 memcpy (lastInput, buffer, BUFFER_LENGTH);
      74             :         }
      75             :         else
      76             :         {
      77           0 :                 int error = errno;
      78           0 :                 if (error != EINTR)
      79             :                 {
      80           0 :                         printf ("input: I/O error occurred - exiting\n");
      81           0 :                         stopLoop ();
      82             :                 }
      83             :         }
      84           0 : }
      85             : 
      86           0 : void printText (ElektraIoTimerOperation * timerOp)
      87             : {
      88           0 :         char * lastInput = elektraIoTimerGetData (timerOp);
      89           0 :         ELEKTRA_NOT_NULL (lastInput);
      90             : 
      91           0 :         if (strcmp (lastInput, "exit") == 0)
      92             :         {
      93           0 :                 printf ("timer: stopping\n");
      94           0 :                 stopLoop ();
      95             :         }
      96             :         else
      97             :         {
      98           0 :                 if (strlen (lastInput) > 0)
      99             :                 {
     100           0 :                         printf ("timer: last text was \"%s\"\n", lastInput);
     101             :                 }
     102             :                 else
     103             :                 {
     104           0 :                         printf ("timer: text is empty\n");
     105             :                 }
     106             :         }
     107           0 : }
     108             : 
     109           0 : int main (void)
     110             : {
     111             :         // Initialize buffer
     112             :         char lastInput[BUFFER_LENGTH];
     113           0 :         memset (lastInput, 0, BUFFER_LENGTH);
     114             : 
     115           0 :         printf ("Please enter some text and press return.\n");
     116           0 :         printf ("Enter \"exit\" to stop and exit.\n");
     117             : 
     118             :         // Create libev event loop
     119           0 :         struct ev_loop * loop = EV_DEFAULT;
     120             : 
     121             :         // Initialize I/O binding tied to event loop
     122           0 :         binding = elektraIoEvNew (loop);
     123             :         // Read lines from STDIN
     124           0 :         input = elektraIoNewFdOperation (STDIN_FILENO, ELEKTRA_IO_READABLE, 1, readText, &lastInput);
     125             :         // Print last read data every second
     126           0 :         output = elektraIoNewTimerOperation (ONE_SECOND, 1, printText, &lastInput);
     127             : 
     128             :         // Add operations to binding
     129           0 :         elektraIoBindingAddFd (binding, input);
     130           0 :         elektraIoBindingAddTimer (binding, output);
     131             : 
     132             :         // Start the event loop
     133           0 :         ev_run (loop, 0);
     134             : 
     135           0 :         ev_loop_destroy (loop);
     136             : 
     137             :         return 0;
     138             : }

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