signal.h

   1 /* Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file signal.h exported symbols from signal.c */
   4
   5 /**
   6  * Task for signal handling.
   7  */
   8 struct signal_task {
   9         /** The signal pipe. */
  10         int fd;
  11         /** The associated task structure. */
  12         struct task *task;
  13 };
  14
  15 /**
  16  * A generic pre-select method for signal tasks.
  17  *
  18  * \param s Passed to para_fd_set().
  19  * \param context Signal task pointer.
  20  *
  21  * This convenience helper is called from several programs which need to handle
  22  * signals, including para_server and para_audiod. These programs define a
  23  * signal task structure and set its ->pre_select method to this function which
  24  * adds the file descriptor of the signal task to the set of descriptors to be
  25  * watched in the next select() call.
  26  *
  27  * Although the second parameter must be in fact a pointer to a signal_task
  28  * structure, the parameter is specified as void * here to match the
  29  * ->pre_select method of struct task.
  30  */
  31 _static_inline_ void signal_pre_select(struct sched *s, void *context)
  32 {
  33         struct signal_task *st = context;
  34         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
  35 }
  36
  37 struct signal_task *signal_init_or_die(void);
  38 void para_sigaction(int sig, void (*handler)(int));
  39 void para_install_sighandler(int);
  40 int para_reap_child(pid_t *pid);
  41 int para_next_signal(fd_set *rfds);
  42 void signal_shutdown(struct signal_task *st);
  43 void para_block_signal(int sig);
  44 void para_unblock_signal(int sig);