From cab935a0ba34797d8b75fe1cfb7624a33d25e671 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Fri, 4 Jul 2008 12:38:26 -0400
Subject: lib9: add write function that withstands interrupts

---
 src/lib9/mkfile  |  1 +
 src/lib9/write.c | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 src/lib9/write.c

(limited to 'src/lib9')

diff --git a/src/lib9/mkfile b/src/lib9/mkfile
index ca615435..782dd274 100644
--- a/src/lib9/mkfile
+++ b/src/lib9/mkfile
@@ -157,6 +157,7 @@ LIB9OFILES=\
 	unsharp.$O\
 	wait.$O\
 	waitpid.$O\
+	write.$O\
 
 OFILES=\
 	$LIB9OFILES\
diff --git a/src/lib9/write.c b/src/lib9/write.c
new file mode 100644
index 00000000..aa32db7f
--- /dev/null
+++ b/src/lib9/write.c
@@ -0,0 +1,23 @@
+#include <u.h>
+#define NOPLAN9DEFINES
+#include <libc.h>
+
+long
+p9write(int f, void *av, long n)
+{
+	char *a;
+	long m, t;
+
+	a = av;
+	t = 0;
+	while(t < n){
+		m = write(f, a+t, n-t);
+		if(m <= 0){
+			if(t == 0)
+				return m;
+			break;
+		}
+		t += m;
+	}
+	return t;
+}
-- 
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