-/*
- * Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file signal.c Signal handling functions. */
#include <signal.h>
* This function creates a pipe, the signal pipe, to deliver pending
* signals to the application (Bernstein's trick). It should be called
* during the application's startup part, followed by subsequent calls
- * to para_install_sighandler() for each signal that should be caught.
+ * to \ref para_install_sighandler() for each signal that should be caught.
*
* A generic signal handler is used for all signals simultaneously. When a
* signal arrives, the signal handler writes the number of the signal received
* by checking if the file descriptor of the other end of the signal pipe is
* ready for reading, see select(2).
*
- * \return This function either succeeds or calls exit(2) to terminate the
+ * \return This function either succeeds or calls exit(3) to terminate the
* current process. On success, a signal task structure is returned.
*/
struct signal_task *signal_init_or_die(void)
errno = save_errno;
return;
}
- if (ret < 0)
- PARA_EMERG_LOG("%s\n", strerror(errno));
- else
- PARA_EMERG_LOG("short write to signal pipe\n");
+ /*
+ * This is a fatal error which should never happen. We must not call
+ * PARA_XXX_LOG() here because this might acquire the log mutex which
+ * is already taken by the main program if the interrupt occurs while a
+ * log message is being printed. The mutex will not be released as long
+ * as this signal handler is running, so a deadlock ensues.
+ */
exit(EXIT_FAILURE);
}