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[Qemu-devel] [PATCH 6/8] char: unix: For files that are nonblocking, re
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PATCH 6/8] char: unix: For files that are nonblocking, report -EAGAIN to calling functions |
Date: |
Thu, 8 Apr 2010 02:32:34 +0530 |
If the chardev we're writing to is nonblocking, just report -EAGAIN to
the caller so that the caller can take any further action if it so
wishes.
Signed-off-by: Amit Shah <address@hidden>
---
qemu-char.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/qemu-char.c b/qemu-char.c
index 208466f..57e9af3 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -497,11 +497,23 @@ int send_all(int fd, const void *buf, int len1)
static int unix_write(int fd, const uint8_t *buf, int len1)
{
int ret, len;
+ int flags;
+ bool nonblock;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags == -1) {
+ flags = 0;
+ }
+
+ nonblock = flags & O_NONBLOCK;
len = len1;
while (len > 0) {
ret = write(fd, buf, len);
if (ret < 0) {
+ if (errno == EAGAIN && nonblock) {
+ return -EAGAIN;
+ }
if (errno != EINTR && errno != EAGAIN) {
if (len1 - len) {
return len1 - len;
--
1.6.2.5
- [Qemu-devel] [PATCH 0/8] (v2) chardev, virtio-console: flow control, error handling, fixes, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 1/8] virtio-serial: throttling: check for throttled status before sending any data, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 2/8] virtio-serial: Unthrottle ports once they're closed, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 3/8] virtio-serial: Discard unconsumed data before sending port close event, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 4/8] virtio-serial: Bus info message for showing port's throttled status, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 5/8] char: Let writers know how much data was written in case of errors, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 6/8] char: unix: For files that are nonblocking, report -EAGAIN to calling functions,
Amit Shah <=
- [Qemu-devel] [PATCH 7/8] virtio-console: Factor out common init between console and generic ports, Amit Shah, 2010/04/07
- [Qemu-devel] [PATCH 8/8] virtio-console: Throttle virtio-serial-bus if we can't consume any more guest data, Amit Shah, 2010/04/07
[Qemu-devel] Re: [PATCH 0/8] (v2) chardev, virtio-console: flow control, error handling, fixes, Paul Brook, 2010/04/07