Add qemu_read_full function
Signed-off-by: M. Mohan Kumar <mo...@in.ibm.com>
---
osdep.c | 32 ++++++++++++++++++++++++++++++++
qemu-common.h | 2 ++
2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/osdep.c b/osdep.c
index 327583b..8d84a88 100644
--- a/osdep.c
+++ b/osdep.c
@@ -127,6 +127,38 @@ ssize_t qemu_write_full(int fd, const void *buf, size_t
count)
}
/*
+ * A variant of read(2) which handles interrupted read.
+ * Simlar to qemu_write_full function
+ *
+ * Return the number of bytes read.
+ *
+ * This function does not work with non-blocking fd's.
+ * errno is set if fewer than `count' bytes are read because of any
+ * error
+ */
+ssize_t qemu_read_full(int fd, void *buf, size_t count)
+{
+ ssize_t ret = 0;
+ ssize_t total = 0;
+
+ while (count) {
+ ret = read(fd, buf, count);
+ if (ret <= 0) {
+ if (errno == EINTR) {
+ continue;
+ }
+ break;
+ }
+
+ count -= ret;
+ buf += ret;
+ total += ret;
+ }
+
+ return total;
+}
+
+/*
* Opens a socket with FD_CLOEXEC set
*/
int qemu_socket(int domain, int type, int protocol)
diff --git a/qemu-common.h b/qemu-common.h
index 40dad52..325b16a 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -207,6 +207,8 @@ 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)
QEMU_WARN_UNUSED_RESULT;
+ssize_t qemu_read_full(int fd, void *buf, size_t count)
+ QEMU_WARN_UNUSED_RESULT;
void qemu_set_cloexec(int fd);
#ifndef _WIN32
--
1.7.3.4
