File kvm-qemu-preXX-write-full.patch of Package kvm

commit 7b5f699dbdf64cf9657e2955bccccc173d9b09fc
Author: Kirill A. Shutemov <kirill@shutemov.name>
Date:   Wed Jan 20 00:56:08 2010 +0100

    Introduce qemu_write_full()
    
    A variant of write(2) which handles partial write.
    
    Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
    Signed-off-by: Juan Quintela <quintela@redhat.com>
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

Index: qemu-kvm-0.12.5/osdep.c
===================================================================
--- qemu-kvm-0.12.5.orig/osdep.c
+++ qemu-kvm-0.12.5/osdep.c
@@ -256,6 +256,33 @@ int qemu_open(const char *name, int flag
     return ret;
 }
 
+/*
+ * A variant of write(2) which handles partial write.
+ *
+ * Return the number of bytes transferred.
+ * Set errno if fewer than `count' bytes are written.
+ */
+ssize_t qemu_write_full(int fd, const void *buf, size_t count)
+{
+    ssize_t ret = 0;
+    ssize_t total = 0;
+
+    while (count) {
+        ret = write(fd, buf, count);
+        if (ret < 0) {
+            if (errno == EINTR)
+                continue;
+            break;
+        }
+
+        count -= ret;
+        buf += ret;
+        total += ret;
+    }
+
+    return total;
+}
+
 #ifndef _WIN32
 /*
  * Creates a pipe with FD_CLOEXEC set on both file descriptors
Index: qemu-kvm-0.12.5/qemu-common.h
===================================================================
--- qemu-kvm-0.12.5.orig/qemu-common.h
+++ qemu-kvm-0.12.5/qemu-common.h
@@ -165,6 +165,7 @@ void qemu_mutex_lock_iothread(void);
 void qemu_mutex_unlock_iothread(void);
 
 int qemu_open(const char *name, int flags, ...);
+ssize_t qemu_write_full(int fd, const void *buf, size_t count);
 void qemu_set_cloexec(int fd);
 
 #ifndef _WIN32