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C/Cpp

References

• GCC cleanup attribute

  attribute-cleanup
  g_autoptr
  echorand-cleanup

• Feature test macros

  feature_test_macros

  #define _GNU_SOURCE

• error functions

  #define APPNAME "appname"
  
  static void error_exit(const char *msg)
  {
      if (!msg || *msg == '\0')
      {
          msg = "an error occurred";
      }
  
      printf("*** %s\nabort...\n", msg);
  
      exit(EXIT_FAILURE);
  }
  
  static void usage_exit()
  {
      printf("*** usage :\n");
      printf("%s param\n", APPNAME);
      printf("abort...\n");
  
      exit(EXIT_FAILURE);
  }
  

• args parsing

  int n = 1;
  
  while (n < argc)
  {
      if (strcmp(argv[n], "-opt") == 0)
      {
          return EXIT_SUCCESS;
      }
      else if (strcmp(argv[n], "-arg") == 0)
      {
          if (++n >= argc)
              usage_exit();
  
          return EXIT_SUCCESS;
      }
      else
      {
          usage_exit();
      }
  
      ++n;
  }
  

• Reporting information using syslog

  https://stackoverflow.com/questions/18658429/

• Current directory in C

  https://stackoverflow.com/questions/298510/

  #include <unistd.h>
  char *getcwd(char *buf, size_t size);
  

• Parse html using C

  https://stackoverflow.com/questions/1527883/

• Execution time of C program

  https://stackoverflow.com/questions/5248915/
  https://stackoverflow.com/questions/55344890/

• Clear the console

  https://stackoverflow.com/questions/228617/

• Polkit applications

  https://www.freedesktop.org/software/polkit/docs/0.105/polkit-apps.html

Functions

• string starts with

  https://stackoverflow.com/questions/4770985/

• _vscprintf

  https://stackoverflow.com/questions/4785381/

• stat, fstat, lstat

  http://manpages.ubuntu.com/manpages/trusty/fr/man2/stat.2.html

• open vs fopen

  https://stackoverflow.com/questions/1658476/

• fgets

  https://www.tutorialspoint.com/c_standard_library/c_function
  https://koor.fr/C/cstdio/fgets.wp

System

• CPU getusage_c

  https://github.com/fho/code_snippets/blob/master/c/getusage.c

• Audio playing detect

  https://stackoverflow.com/questions/22144203/

• GKeyFile

  https://gist.github.com/zdxerr/709169

Process

• Execute program in C

  https://stackoverflow.com/questions/5237482/

• popen

  https://tldp.org/LDP/lpg/node12.html

• posix_spawn

  https://www.systutorials.com/a-posix_spawn-example-in-c-to-create-child-process-on-linux/

• Exit status code

  https://stackoverflow.com/questions/27306764/

• select

  https://www.blaess.fr/christophe/2013/12/27/comprendre-le-fonctionnement-de-select/

Daemon

• Examples

  https://gist.github.com/copyninja/1033862
  https://www.thegeekstuff.com/2012/02/c-daemon-process/
  https://www.google.com/search?channel=fs&client=ubuntu&q=daemon+example+in+c
  http://netzmafia.de/skripten/unix/linux-daemon-howto.html
  https://lloydrochester.com/post/c/unix-daemon-example/
  https://github.com/pasce/daemon-skeleton-linux-c
  https://gitlab.com/sulincix/fork/-/blob/master/src/pfork.c

Redirect IO

• Reading from a pipe

  https://stackoverflow.com/questions/1151029/

• output of process in C

  http://www.microhowto.info/howto/capture_the_output_of_a_child_process_in_c.html

• Redirect pipe dup2

  https://linuxfr.org/forums/programmation-c--2/posts/communication-entre-processus-avec-pipe-et-dup2

• Redirect to buffer or file

  https://stackoverflow.com/questions/2605130/

Articles

• QtCreator printf

  https://chowdera.com/2020/12/20201208210320326z.html

  setbuf(stdout, NULL);

• QtCreator per-project tab spacing

  https://forum.qt.io/topic/86319/qt-creator-how-to-do-per-pro

• Memory usage of current process

  https://stackoverflow.com/questions/1558402/

• RAM usage of a process using its ID

  https://stackoverflow.com/questions/67224020/