Backup errno in net_would_block
Safe and restore the value of errno in net_would_block to be sure
it's not affected by the guarding call to fcntl. Fixes #845.
diff --git a/library/net.c b/library/net.c
index b6b08ed..f08bbec 100644
--- a/library/net.c
+++ b/library/net.c
@@ -259,13 +259,18 @@
*/
static int net_would_block( const mbedtls_net_context *ctx )
{
+ int err = errno;
+
/*
* Never return 'WOULD BLOCK' on a non-blocking socket
*/
if( ( fcntl( ctx->fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK )
+ {
+ errno = err;
return( 0 );
+ }
- switch( errno )
+ switch( errno = err )
{
#if defined EAGAIN
case EAGAIN: