From 90b12bd71bb9fc79a4640b9112c13ef529d0196a Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Fri, 5 Dec 2014 22:26:11 +0000
Subject: Initial commit

---
 src/libs6/s6_svc_write.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 src/libs6/s6_svc_write.c

(limited to 'src/libs6/s6_svc_write.c')

diff --git a/src/libs6/s6_svc_write.c b/src/libs6/s6_svc_write.c
new file mode 100644
index 0000000..ea9eee5
--- /dev/null
+++ b/src/libs6/s6_svc_write.c
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/djbunix.h>
+#include <s6/s6-supervise.h>
+
+int s6_svc_write (char const *fifo, char const *data, unsigned int datalen)
+{
+  int fd = open_write(fifo) ;
+  if (fd < 0) return (errno == ENXIO) ? 0 : -1 ;
+  else if (ndelay_off(fd) == -1) return -1 ;
+  else if (fd_write(fd, data, datalen) == -1)
+  {
+    register int e = errno ;
+    fd_close(fd) ;
+    errno = e ;
+    return -1 ;
+  }
+  fd_close(fd) ;
+  return 1 ;
+}
-- 
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