X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=signal.c;h=0490a3a1f10a0897c311bc144ba7ce876652fb14;hp=3f3dbf69d78dadb0ad8e732930dba88e4317418f;hb=bdf3b7573b4a2ef6a84bdf34442063b32977f54e;hpb=5c556c52f1196cea4536d36b683372de532943a9

diff --git a/signal.c b/signal.c
index 3f3dbf69..0490a3a1 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>
@@ -48,7 +48,7 @@ int para_signal_init(void)
 		goto err_out;
 	return signal_pipe[0];
 err_out:
-	PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
+	PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 	exit(EXIT_FAILURE);
 }
 
@@ -85,13 +85,13 @@ int para_reap_child(pid_t *pid)
 	if (*pid < 0)
 		return -ERRNO_TO_PARA_ERROR(errno);
 	if (WIFEXITED(status))
-		PARA_DEBUG_LOG("child %i exited. Exit status: %i\n", *pid,
+		PARA_DEBUG_LOG("child %i exited. Exit status: %i\n", (int)*pid,
 			WEXITSTATUS(status));
 	else if (WIFSIGNALED(status))
-		PARA_DEBUG_LOG("child %i was killed by signal %i\n", *pid,
+		PARA_DEBUG_LOG("child %i was killed by signal %i\n", (int)*pid,
 			WTERMSIG(status));
 	else
-		PARA_WARNING_LOG("child %i terminated abormally\n", *pid);
+		PARA_WARNING_LOG("child %i terminated abormally\n", (int)*pid);
 	return 1;
 }
 
@@ -124,26 +124,36 @@ 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));
 
-	if ((r = read(signal_pipe[0], &s, sizeof(s)) == sizeof(s)) > 0) {
-		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.
+ */
 void para_signal_shutdown(void)
 {
 	close(signal_pipe[1]);