net: handle EAGAIN from tapfd write()

If a write() on tapfd returns EAGAIN, return zero so that the packet
gets queued (in the case of async send) and enable polling tapfd for
writing.

When tapfd becomes writable, disable write polling and flush any queued
packets.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
1 file changed
tree: 50f9190ebc04eba36802a8f56f321197a4f613cc
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  39. bswap.h
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  43. buffered_file.c
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  45. cache-utils.c
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  60. cpu-exec.c
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  64. cutils.c
  65. d3des.c
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  81. gdbstub.c
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  84. host-utils.c
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  88. hppa-dis.c
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  90. hxtool
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  115. mips-dis.c
  116. mips.ld
  117. mipsel.ld
  118. module.c
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  120. monitor.c
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  124. net-checksum.c
  125. net.c
  126. net.h
  127. osdep.c
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  129. pci-ids.txt
  130. posix-aio-compat.c
  131. posix-aio-compat.h
  132. ppc-dis.c
  133. ppc.ld
  134. ppc64.ld
  135. qemu-aio.h
  136. qemu-binfmt-conf.sh
  137. qemu-char.c
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  139. qemu-common.h
  140. qemu-doc.texi
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  148. qemu-monitor.hx
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  154. qemu-sockets.c
  155. qemu-tech.texi
  156. qemu-thread.c
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  158. qemu-timer.h
  159. qemu-tool.c
  160. qemu.sasl
  161. qemu_socket.h
  162. readline.c
  163. readline.h
  164. README
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  166. s390-dis.c
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  168. savevm.c
  169. sdl.c
  170. sdl_keysym.h
  171. sh4-dis.c
  172. softmmu-semi.h
  173. softmmu_defs.h
  174. softmmu_exec.h
  175. softmmu_header.h
  176. softmmu_template.h
  177. sparc-dis.c
  178. sparc.ld
  179. sparc64.ld
  180. sys-queue.h
  181. sysemu.h
  182. tap-win32.c
  183. targphys.h
  184. texi2pod.pl
  185. thunk.c
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  187. TODO
  188. tool-osdep.c
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  191. usb-bsd.c
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  195. vgafont.h
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  197. vnc-auth-sasl.c
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  199. vnc-auth-vencrypt.c
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  201. vnc-tls.c
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  203. vnc.c
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  205. vnc_keysym.h
  206. vnchextile.h
  207. x86_64.ld
  208. x_keymap.c
  209. x_keymap.h