X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=signal.c;h=f8be2f4612002214f669fa74ce92390866b0dc90;hp=67af16558fa9357518eaef956d74f477c8625794;hb=8694f85b70488f2cdb48a1e853bdfae68dabc99f;hpb=c73d23911d78ed10179c12ef8f79a3fcf3bbcdaf

diff --git a/signal.c b/signal.c
index 67af1655..f8be2f46 100644
--- a/signal.c
+++ b/signal.c
@@ -1,9 +1,9 @@
 /*
- * Copyright (C) 2004-2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2004-2008 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
-/** \file signal.c signal handling functions */
+/** \file signal.c Signal handling functions. */
 
 #include <signal.h>
 #include <sys/types.h>
@@ -73,7 +73,7 @@ static void generic_signal_handler(int s)
  * one otherwise. If and only if the function returns one, the content of \a
  * pid is meaningful.
  *
- * \sa waitpid(2)
+ * \sa waitpid(2).
  */
 int para_reap_child(pid_t *pid)
 {
@@ -110,12 +110,15 @@ void para_reap_children(void)
 }
 
 /**
- * wrapper around signal(2)
- * \param sig the number of the signal to catch
+ * Wrapper around signal(2).
+ *
+ * \param sig The number of the signal to catch.
  *
  * This installs the generic signal handler for the given signal.
+ *
  * \return This function returns 1 on success and \p -E_SIGNAL_SIG_ERR on errors.
- * \sa signal(2)
+ *
+ * \sa signal(2).
  */
 int para_install_sighandler(int sig)
 {
@@ -124,29 +127,35 @@ int para_install_sighandler(int sig)
 }
 
 /**
- * return number of next pending signal
+ * Return the number of next pending signal.
  *
  * This should be called if the fd for the signal pipe is ready for reading.
  *
- * \return On success, the number of the received signal is returned. \p
- * -E_SIGNAL_READ is returned if a read error occurred while reading the signal
- * pipe.  If the read was interrupted by another signal the function returns 0.
+ * \return On success, the number of the received signal is returned.  If the
+ * read returned zero or was interrupted by another signal the function returns
+ * 0.  Otherwise, a negative error value is returned.
  */
 int para_next_signal(void)
 {
 	int s;
-	ssize_t r;
+	ssize_t r = read(signal_pipe[0], &s, sizeof(s));
 
-	r = read(signal_pipe[0], &s, sizeof(s));
-	if (r == sizeof(s)) {
-		PARA_DEBUG_LOG("next signal: %d\n", s);
-		return s;
+	if (!r) {
+		PARA_CRIT_LOG("read from signal pipe returned zero\n");
+		return 0;
+	}
+	if (r < 0) {
+		if (errno == EAGAIN || errno == EINTR)
+			return 0;
+		return -ERRNO_TO_PARA_ERROR(errno);
 	}
-	return r < 0 && (errno != EAGAIN)? 0 : -E_SIGNAL_READ;
+	assert(r == sizeof(s));
+	PARA_DEBUG_LOG("next signal: %d\n", s);
+	return s;
 }
 
 /**
- * Close the signal pipe.
+ * Close the write end of the signal pipe.
  */
 void para_signal_shutdown(void)
 {