lib: add sys_read_v - void variant of sys_read

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Christian Ambach <ambi@samba.org>

2 files changed, 17 insertions, 0 deletions

diff --git a/lib/util/sys_rw.c b/lib/util/sys_rw.c
index f625066ebcc..3962d492714 100644
--- a/lib/util/sys_rw.c
+++ b/lib/util/sys_rw.c
@@ -40,6 +40,22 @@ ssize_t sys_read(int fd, void *buf, size_t count)
 	return ret;
 }
 
+/**
+ * read wrapper, void variant:
+ * This is intended to be used as a void variant of
+ * read in situations where the caller wants to ignore
+ * the result. Hence not checking for EAGAIN|EWOULDBLOCK.
+ */
+void sys_read_v(int fd, void *buf, size_t count)
+{
+	ssize_t ret;
+
+	do {
+		ret = read(fd, buf, count);
+	} while (ret == -1 && errno == EINTR);
+}
+
+
 /*******************************************************************
 A write wrapper that will deal with EINTR/EWOULDBLOCK.
 ********************************************************************/
diff --git a/lib/util/sys_rw.h b/lib/util/sys_rw.h
index ee1584e904f..6b708a88928 100644
--- a/lib/util/sys_rw.h
+++ b/lib/util/sys_rw.h
@@ -28,6 +28,7 @@
 struct iovec;
 
 ssize_t sys_read(int fd, void *buf, size_t count);
+void sys_read_v(int fd, void *buf, size_t count);
 ssize_t sys_write(int fd, const void *buf, size_t count);
 ssize_t sys_writev(int fd, const struct iovec *iov, int iovcnt);
 ssize_t sys_pread(int fd, void *buf, size_t count, off_t off);