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[Qemu-devel] [PATCH v3 03/15] add qemu_send_full and qemu_recv_full
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v3 03/15] add qemu_send_full and qemu_recv_full |
Date: |
Wed, 5 Oct 2011 09:17:33 +0200 |
Signed-off-by: Paolo Bonzini <address@hidden>
---
osdep.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-common.h | 4 +++
2 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/osdep.c b/osdep.c
index 56e6963..718a25d 100644
--- a/osdep.c
+++ b/osdep.c
@@ -166,3 +166,70 @@ int qemu_accept(int s, struct sockaddr *addr, socklen_t
*addrlen)
return ret;
}
+
+/*
+ * A variant of send(2) which handles partial write.
+ *
+ * Return the number of bytes transferred, which is only
+ * smaller than `count' if there is an error.
+ *
+ * This function won't work with non-blocking fd's.
+ * Any of the possibilities with non-bloking fd's is bad:
+ * - return a short write (then name is wrong)
+ * - busy wait adding (errno == EAGAIN) to the loop
+ */
+ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags)
+{
+ ssize_t ret = 0;
+ ssize_t total = 0;
+
+ while (count) {
+ ret = send(fd, buf, count, flags);
+ if (ret < 0) {
+ if (errno == EINTR) {
+ continue;
+ }
+ break;
+ }
+
+ count -= ret;
+ buf += ret;
+ total += ret;
+ }
+
+ return total;
+}
+
+/*
+ * A variant of recv(2) which handles partial write.
+ *
+ * Return the number of bytes transferred, which is only
+ * smaller than `count' if there is an error.
+ *
+ * This function won't work with non-blocking fd's.
+ * Any of the possibilities with non-bloking fd's is bad:
+ * - return a short write (then name is wrong)
+ * - busy wait adding (errno == EAGAIN) to the loop
+ */
+ssize_t qemu_recv_full(int fd, const void *buf, size_t count, int flags)
+{
+ ssize_t ret = 0;
+ ssize_t total = 0;
+
+ while (count) {
+ ret = recv(fd, buf, count, flags);
+ if (ret <= 0) {
+ if (ret < 0 && errno == EINTR) {
+ continue;
+ }
+ break;
+ }
+
+ count -= ret;
+ buf += ret;
+ total += ret;
+ }
+
+ return total;
+}
+
diff --git a/qemu-common.h b/qemu-common.h
index 5e87bdf..ed9112a 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -189,6 +189,10 @@ 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_send_full(int fd, const void *buf, size_t count, int flags)
+ QEMU_WARN_UNUSED_RESULT;
+ssize_t qemu_recv_full(int fd, const void *buf, size_t count, int flags)
+ QEMU_WARN_UNUSED_RESULT;
void qemu_set_cloexec(int fd);
#ifndef _WIN32
--
1.7.6
- [Qemu-devel] [PATCH v3 00/15] NBD improvements, Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 05/15] block: emulate .bdrv_flush() using .bdrv_aio_flush(), Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 06/15] block: group together the plugging of synchronous IO emulation, Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 08/15] block: add bdrv_co_discard and bdrv_aio_discard support, Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 07/15] block: add bdrv_co_flush support, Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 09/15] nbd: fix error handling in the server, Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 11/15] nbd: add support for NBD_CMD_FLAG_FUA, Paolo Bonzini, 2011/10/05
- [Qemu-devel] [PATCH v3 10/15] nbd: add support for NBD_CMD_FLUSH, Paolo Bonzini, 2011/10/05