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  * Monitor the signal fd for reading.
  17  *
  18  * \param s The scheduler instance.
  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 set up a
  23  * signal pipe and a signal task structure, and use this function to tell the
  24  * scheduler to monitor the read end of the pipe.
  25  *
  26  * Although the second parameter must be in fact a pointer to a signal_task
  27  * structure, the parameter is specified as void * here to match the signature
  28  * declared in struct \ref task_info.
  29  */
  30 _static_inline_ void signal_pre_monitor(struct sched *s, void *context)
  31 {
  32         struct signal_task *st = context;
  33         sched_monitor_readfd(st->fd, s);
  34 }
  35
  36 struct signal_task *signal_init_or_die(void);
  37 void para_sigaction(int sig, void (*handler)(int));
  38 void para_install_sighandler(int);
  39 int para_reap_child(pid_t *pid);
  40 int para_next_signal(void);
  41 void signal_shutdown(struct signal_task *st);
  42 void para_block_signal(int sig);
  43 void para_unblock_signal(int sig);