none/tests/coolo_sigaction.cpp

   1
   2 #include <signal.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6
   7 static struct sigaction oldChildHandlerData;
   8
   9 void theHandler(int arg)
  10 {
  11   printf("handled %s\n", arg == SIGCHLD ? "SIGCHLD" : "?!unexpected signal?!" );
  12 }
  13
  14 void setupHandlers()
  15 {
  16   struct sigaction act;
  17   act.sa_handler=theHandler;
  18   sigemptyset(&(act.sa_mask));
  19   sigaddset(&(act.sa_mask), SIGCHLD);
  20   // Make sure we don't block this signal. gdb tends to do that :-(
  21   sigprocmask(SIG_UNBLOCK, &(act.sa_mask), 0);
  22
  23   act.sa_flags = SA_NOCLDSTOP;
  24
  25   // CC: take care of SunOS which automatically restarts interrupted system
  26   // calls (and thus does not have SA_RESTART)
  27
  28 #ifdef SA_RESTART
  29   act.sa_flags |= SA_RESTART;
  30 #endif
  31
  32   sigaction( SIGCHLD, &act, &oldChildHandlerData );
  33
  34   act.sa_handler=SIG_IGN;
  35   sigemptyset(&(act.sa_mask));
  36   sigaddset(&(act.sa_mask), SIGPIPE);
  37   act.sa_flags = 0;
  38   sigaction( SIGPIPE, &act, 0L);
  39 }
  40
  41 int main()
  42 {
  43     char buffer[200];
  44     setupHandlers();
  45     FILE *p = popen("echo Hallo World", "r");
  46     while (!feof(p)) {
  47         int n = fread(buffer, 200, 1, p);
  48         __attribute__((unused)) ssize_t nw = write(2, buffer, n);
  49     }
  50     pclose(p);
  51     return 0;
  52 }