From: Andre Noll <maan@systemlinux.org>
Date: Wed, 10 Oct 2007 18:19:26 +0000 (+0200)
Subject: Get rid of E_WAITPID.
X-Git-Tag: v0.3.0~283
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=6751fdf54c240791298420b3034a32aa9cdc4200

Get rid of E_WAITPID.
---

diff --git a/error.h b/error.h
index cc953d28..40cccd56 100644
--- a/error.h
+++ b/error.h
@@ -264,7 +264,6 @@ extern const char **para_errlist[];
 #define SIGNAL_ERRORS \
 	PARA_ERROR(SIGNAL_SIG_ERR, "signal() retured SIG_ERR"), \
 	PARA_ERROR(SIGNAL_READ, "read error from signal pipe"), \
-	PARA_ERROR(WAITPID, "waitpid error"), \
 
 
 #define STRING_ERRORS \
diff --git a/gui.c b/gui.c
index f884e864..a71a2a7c 100644
--- a/gui.c
+++ b/gui.c
@@ -726,10 +726,11 @@ static void init_curses(void)
 
 static void check_sigchld(void)
 {
+	int ret;
 	pid_t pid;
 reap_next_child:
-	pid = para_reap_child();
-	if (pid <= 0)
+	ret = para_reap_child(&pid);
+	if (ret <= 0)
 		return;
 	if (pid == cmd_pid) {
 		cmd_pid = 0;
diff --git a/server.c b/server.c
index d5946e47..7171c6e2 100644
--- a/server.c
+++ b/server.c
@@ -540,8 +540,8 @@ repeat:
 			break;
 		case SIGCHLD:
 			for (;;) {
-				pid = para_reap_child();
-				if (pid <= 0)
+				ret = para_reap_child(&pid);
+				if (ret <= 0)
 					break;
 				if (pid != afs_pid)
 					continue;
diff --git a/signal.c b/signal.c
index 1db008ca..128f6bba 100644
--- a/signal.c
+++ b/signal.c
@@ -62,45 +62,50 @@ static void generic_signal_handler(int s)
 }
 
 /**
- * reap one child
+ * Reap one child.
  *
- * call waitpid() and print a log message containing the pid
- * and the cause of the child's death.
+ * \para, pid In case a child died, its pid is returned here.
+ *
+ * Call waitpid() and print a log message containing the pid and the cause of
+ * the child's death.
+ *
+ * \return A (negative) paraslash error code on errors, zero, if no child died,
+ * one otherwise. If and only if the function returns one, the content of \a
+ * pid is meaningful.
  *
- * \return Like \p waitpid(), this function returns the process ID of the
- * terminated child; on error, \p -E_WAITPID is returned.
  * \sa waitpid(2)
  */
-pid_t para_reap_child(void)
+int para_reap_child(pid_t *pid)
 {
 	int status;
-	pid_t pid = waitpid(-1, &status, WNOHANG);
+	*pid = waitpid(-1, &status, WNOHANG);
 
-	if (pid <= 0) {
-		if (pid < 0)
-			pid = -E_WAITPID;
-		return pid;
-	}
+	if (!*pid)
+		return 0;
+	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", *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", *pid,
 			WTERMSIG(status));
 	else
-		PARA_WARNING_LOG("child %i terminated abormally\n", pid);
-	return pid;
+		PARA_WARNING_LOG("child %i terminated abormally\n", *pid);
+	return 1;
 }
 
 /**
- * paraslash's zombie killer
+ * Paraslash's zombie killer.
  *
  * It just calls \p para_reap_child() until there are no more children left to
  * reap.
  */
 void para_reap_children(void)
 {
-	while (para_reap_child() > 0)
+	pid_t pid;
+
+	while (para_reap_child(&pid) > 0)
 		; /* nothing */
 }
 
diff --git a/signal.h b/signal.h
index 92144830..5df64c33 100644
--- a/signal.h
+++ b/signal.h
@@ -21,5 +21,5 @@ struct signal_task {
 int para_signal_init(void);
 int para_install_sighandler(int);
 void para_reap_children(void);
-pid_t para_reap_child(void);
+int para_reap_child(pid_t *pid);
 int para_next_signal(void);