[v4,09/27] osdep: Introduce qemu_dup

Commit Message

Fam Zheng May 10, 2016, 2:50 a.m. UTC

This takes care both the CLOEXEC flag and fd-path mapping for image
locking.

Signed-off-by: Fam Zheng <[e-mail]>
---
 include/qemu/osdep.h |  1 +
 util/osdep.c         | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

Patch

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 089c13f..8174902 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -251,6 +251,7 @@  int qemu_madvise(void *addr, size_t len, int advice);
 
 int qemu_open(const char *name, int flags, ...);
 int qemu_close(int fd);
+int qemu_dup(int fd);
 int qemu_lock_fd(int fd, int64_t start, int64_t len, bool readonly);
 int qemu_unlock_fd(int fd, int64_t start, int64_t len);
 
diff --git a/util/osdep.c b/util/osdep.c
index 1510cbf..66c993a 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -408,6 +408,21 @@  int qemu_close(int fd)
     return qemu_fd_close(fd);
 }
 
+int qemu_dup(int fd)
+{
+    char *path;
+    int ret = qemu_dup_flags(fd, 0);
+    if (ret == -1) {
+        return ret;
+    }
+
+    path = g_hash_table_lookup(fd_to_path, GINT_TO_POINTER(fd));
+    assert(path);
+    qemu_fd_add_record(ret, path);
+    return ret;
+}
+
+
 /*
  * A variant of write(2) which handles partial write.
  *