This patch adds support to qemu_open to dup(X) a pre-opened file
descriptor if the filename is of the format /dev/fd/X.
This can be used when QEMU is restricted from opening files, and
the management application opens files on QEMU's behalf.
v2:
-Get rid of file_open and move dup code to qemu_open (kw...@redhat.com)
-Use strtol wrapper instead of atoi (kw...@redhat.com)
Signed-off-by: Corey Bryant <cor...@linux.vnet.ibm.com>
---
osdep.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/osdep.c b/osdep.c
index 3e6bada..c17cdcb 100644
--- a/osdep.c
+++ b/osdep.c
@@ -82,6 +82,19 @@ int qemu_open(const char *name, int flags, ...)
int ret;
int mode = 0;
+#ifndef _WIN32
+ const char *p;
+
+ /* Attempt dup of fd for pre-opened file */
+ if (strstart(name, "/dev/fd/", &p)) {
+ ret = qemu_parse_fd(p);
+ if (ret == -1) {
+ return -1;
+ }
+ return dup(ret);
+ }
+#endif
+
if (flags & O_CREAT) {
va_list ap;
--
1.7.10.2
