[Qemu-devel] [PATCH v7 05/20] osdep: Add qemu_lock_fd and qemu_unlock_fd

[Fam Zheng <famz@redhat.com>]

They are wrappers of POSIX fcntl "file private locking".

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 include/qemu/osdep.h |  2 ++
 util/osdep.c         | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 9e9fa61..f773f49 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -286,6 +286,8 @@ int qemu_close(int fd);
 #ifndef _WIN32
 int qemu_dup(int fd);
 #endif
+int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
+int qemu_unlock_fd(int fd, int64_t start, int64_t len);
 
 #if defined(__HAIKU__) && defined(__i386__)
 #define FMT_pid "%ld"
diff --git a/util/osdep.c b/util/osdep.c
index 06fb1cf..b85a490 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -140,6 +140,35 @@ static int qemu_parse_fdset(const char *param)
 {
     return qemu_parse_fd(param);
 }
+
+static int qemu_lock_fcntl(int fd, int64_t start, int64_t len, int fl_type)
+{
+#ifdef F_OFD_SETLK
+    int ret;
+    struct flock fl = {
+        .l_whence = SEEK_SET,
+        .l_start  = start,
+        .l_len    = len,
+        .l_type   = fl_type,
+    };
+    do {
+        ret = fcntl(fd, F_OFD_SETLK, &fl);
+    } while (ret == -1 && errno == EINTR);
+    return ret == -1 ? -errno : 0;
+#else
+    return -ENOTSUP;
+#endif
+}
+
+int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive)
+{
+    return qemu_lock_fcntl(fd, start, len, exclusive ? F_WRLCK : F_RDLCK);
+}
+
+int qemu_unlock_fd(int fd, int64_t start, int64_t len)
+{
+    return qemu_lock_fcntl(fd, start, len, F_UNLCK);
+}
 #endif
 
 /*
-- 
2.7.4