From 3718832a1542f7bf786a1678741b8566ad3a35c6 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Sat, 16 Feb 2008 13:20:56 +0000
Subject: *: more readable handling of pipe fds. No code changes.

---
 runit/runsv.c | 47 ++++++++++++++++++++++++-----------------------
 1 file changed, 24 insertions(+), 23 deletions(-)

(limited to 'runit/runsv.c')

diff --git a/runit/runsv.c b/runit/runsv.c
index e9a074580..e1d99e2df 100644
--- a/runit/runsv.c
+++ b/runit/runsv.c
@@ -90,8 +90,8 @@ struct globals {
 	smallint haslog;
 	smallint sigterm;
 	smallint pidchanged;
-	int selfpipe[2];
-	int logpipe[2];
+	struct fd_pair selfpipe;
+	struct fd_pair logpipe;
 	char *dir;
 	struct svdir svd[2];
 };
@@ -130,13 +130,13 @@ static void warn_cannot(const char *m)
 
 static void s_child(int sig_no)
 {
-	write(selfpipe[1], "", 1);
+	write(selfpipe.wr, "", 1);
 }
 
 static void s_term(int sig_no)
 {
 	sigterm = 1;
-	write(selfpipe[1], "", 1); /* XXX */
+	write(selfpipe.wr, "", 1); /* XXX */
 }
 
 static char *add_str(char *p, const char *to_add)
@@ -275,7 +275,7 @@ static unsigned custom(struct svdir *s, char c)
 				return 0;
 			}
 			if (!pid) {
-				if (haslog && dup2(logpipe[1], 1) == -1)
+				if (haslog && dup2(logpipe.wr, 1) == -1)
 					warn_cannot("setup stdout for control/?");
 				prog[0] = a;
 				prog[1] = NULL;
@@ -335,13 +335,14 @@ static void startservice(struct svdir *s)
 	if (p == 0) {
 		/* child */
 		if (haslog) {
+			/* NB: bug alert! right order is close, then dup2 */
 			if (s->islog) {
-				xdup2(logpipe[0], 0);
-				close(logpipe[1]);
 				xchdir("./log");
+				close(logpipe.wr);
+				xdup2(logpipe.rd, 0);
 			} else {
-				xdup2(logpipe[1], 1);
-				close(logpipe[0]);
+				close(logpipe.rd);
+				xdup2(logpipe.wr, 1);
 			}
 		}
 		signal(SIGCHLD, SIG_DFL);
@@ -452,11 +453,11 @@ int runsv_main(int argc, char **argv)
 		bb_show_usage();
 	dir = argv[1];
 
-	xpipe(selfpipe);
-	close_on_exec_on(selfpipe[0]);
-	close_on_exec_on(selfpipe[1]);
-	ndelay_on(selfpipe[0]);
-	ndelay_on(selfpipe[1]);
+	xpiped_pair(selfpipe);
+	close_on_exec_on(selfpipe.rd);
+	close_on_exec_on(selfpipe.wr);
+	ndelay_on(selfpipe.rd);
+	ndelay_on(selfpipe.wr);
 
 	sig_block(SIGCHLD);
 	sig_catch(SIGCHLD, s_child);
@@ -489,9 +490,9 @@ int runsv_main(int argc, char **argv)
 			gettimeofday_ns(&svd[1].start);
 			if (stat("log/down", &s) != -1)
 				svd[1].want = W_DOWN;
-			xpipe(logpipe);
-			close_on_exec_on(logpipe[0]);
-			close_on_exec_on(logpipe[1]);
+			xpiped_pair(logpipe);
+			close_on_exec_on(logpipe.rd);
+			close_on_exec_on(logpipe.wr);
 		}
 	}
 
@@ -572,7 +573,7 @@ int runsv_main(int argc, char **argv)
 			if (svd[0].want == W_UP || svd[0].state == S_FINISH)
 				startservice(&svd[0]);
 
-		x[0].fd = selfpipe[0];
+		x[0].fd = selfpipe.rd;
 		x[0].events = POLLIN;
 		x[1].fd = svd[0].fdcontrol;
 		x[1].events = POLLIN;
@@ -585,7 +586,7 @@ int runsv_main(int argc, char **argv)
 		sig_block(SIGTERM);
 		sig_block(SIGCHLD);
 
-		while (read(selfpipe[0], &ch, 1) == 1)
+		while (read(selfpipe.rd, &ch, 1) == 1)
 			continue;
 
 		for (;;) {
@@ -630,7 +631,7 @@ int runsv_main(int argc, char **argv)
 						sleep(1);
 				}
 			}
-		}
+		} /* for (;;) */
 		if (read(svd[0].fdcontrol, &ch, 1) == 1)
 			ctrl(&svd[0], ch);
 		if (haslog)
@@ -649,11 +650,11 @@ int runsv_main(int argc, char **argv)
 				svd[1].want = W_EXIT;
 				/* stopservice(&svd[1]); */
 				update_status(&svd[1]);
-				close(logpipe[1]);
-				close(logpipe[0]);
+				close(logpipe.wr);
+				close(logpipe.rd);
 			}
 		}
-	}
+	} /* for (;;) */
 	/* not reached */
 	return 0;
 }
-- 
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