From: Kirill A. Shutemov <kir...@shutemov.name>
A variant of write(2) which handles partial write.
Signed-off-by: Kirill A. Shutemov <kir...@shutemov.name>
Signed-off-by: Juan Quintela <quint...@redhat.com>
---
osdep.c | 27 +++++++++++++++++++++++++++
qemu-common.h | 1 +
2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/osdep.c b/osdep.c
index 1310684..09fbc99 100644
--- a/osdep.c
+++ b/osdep.c
@@ -243,6 +243,33 @@ int qemu_open(const char *name, int flags, ...)
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
diff --git a/qemu-common.h b/qemu-common.h
index 8630f8c..a8144cb 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -160,6 +160,7 @@ 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
--
1.6.5.2
