1  /* Example of a bad call within a signal handler.
       2     'handler' calls 'custom_logger' which calls 'fprintf', and 'fprintf' is
       3     not allowed from a signal handler.  */
       4  /* { dg-require-effective-target signal } */
       5  
       6  #include <stdio.h>
       7  #include <signal.h>
       8  
       9  extern void body_of_program(void);
      10  
      11  int logging = 1;
      12  
      13  void custom_logger(const char *msg)
      14  {
      15    if (logging)
      16      fprintf(stderr, "LOG: %s", msg); /* { dg-warning "call to 'fprintf' from within signal handler" } */
      17  }
      18  
      19  static void handler(int signum)
      20  {
      21    custom_logger("got signal");
      22  }
      23  
      24  int main(int argc, const char *argv)
      25  {
      26    custom_logger("started");
      27  
      28    signal(SIGINT, handler); /* { dg-message "registering 'handler' as signal handler" } */
      29  
      30    body_of_program();
      31  
      32    custom_logger("stopped");
      33  
      34    return 0;
      35  }