[PATCH v3 08/35] savevm/QEMUFile: consolidate QEMUFile functions a bit

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

- add qemu_file_fd() for later use
- drop qemu_stdio_fd
  Now qemu_file_fd() replaces qemu_stdio_fd().
- savevm/QEMUFileSocket: drop duplicated member fd
  fd is already stored in QEMUFile so drop duplicated member
   QEMUFileSocket::fd.
- remove QEMUFileSocket

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 migration-exec.c |    4 ++--
 migration-fd.c   |    2 +-
 qemu-file.h      |    2 +-
 savevm.c         |   40 +++++++++++++++++++---------------------
 4 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/migration-exec.c b/migration-exec.c
index 6c97db9..95e9779 100644
--- a/migration-exec.c
+++ b/migration-exec.c
@@ -98,7 +98,7 @@ static void exec_accept_incoming_migration(void *opaque)
     QEMUFile *f = opaque;
 
     process_incoming_migration(f);
-    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
+    qemu_set_fd_handler2(qemu_file_fd(f), NULL, NULL, NULL, NULL);
     qemu_fclose(f);
 }
 
@@ -113,7 +113,7 @@ int exec_start_incoming_migration(const char *command)
         return -errno;
     }
 
-    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL,
+    qemu_set_fd_handler2(qemu_file_fd(f), NULL,
 			 exec_accept_incoming_migration, NULL, f);
 
     return 0;
diff --git a/migration-fd.c b/migration-fd.c
index 7335167..b3c54e5 100644
--- a/migration-fd.c
+++ b/migration-fd.c
@@ -104,7 +104,7 @@ static void fd_accept_incoming_migration(void *opaque)
     QEMUFile *f = opaque;
 
     process_incoming_migration(f);
-    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
+    qemu_set_fd_handler2(qemu_file_fd(f), NULL, NULL, NULL, NULL);
     qemu_fclose(f);
 }
 
diff --git a/qemu-file.h b/qemu-file.h
index 9b6dd08..bc222dc 100644
--- a/qemu-file.h
+++ b/qemu-file.h
@@ -70,7 +70,7 @@ QEMUFile *qemu_fdopen(int fd, const char *mode);
 QEMUFile *qemu_fopen_socket(int fd);
 QEMUFile *qemu_popen(FILE *popen_file, const char *mode);
 QEMUFile *qemu_popen_cmd(const char *command, const char *mode);
-int qemu_stdio_fd(QEMUFile *f);
+int qemu_file_fd(QEMUFile *f);
 int qemu_fclose(QEMUFile *f);
 int qemu_fflush(QEMUFile *f);
 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size);
diff --git a/savevm.c b/savevm.c
index 0c7af43..e24041b 100644
--- a/savevm.c
+++ b/savevm.c
@@ -178,6 +178,7 @@ struct QEMUFile {
     uint8_t buf[IO_BUF_SIZE];
 
     int last_error;
+    int fd;     /* -1 means fd isn't associated */
 };
 
 typedef struct QEMUFileStdio
@@ -186,19 +187,18 @@ typedef struct QEMUFileStdio
     QEMUFile *file;
 } QEMUFileStdio;
 
-typedef struct QEMUFileSocket
+typedef struct QEMUFileFD
 {
-    int fd;
     QEMUFile *file;
-} QEMUFileSocket;
+} QEMUFileFD;
 
 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 {
-    QEMUFileSocket *s = opaque;
+    QEMUFileFD *s = opaque;
     ssize_t len;
 
     do {
-        len = qemu_recv(s->fd, buf, size, 0);
+        len = qemu_recv(s->file->fd, buf, size, 0);
     } while (len == -1 && socket_error() == EINTR);
 
     if (len == -1)
@@ -207,9 +207,9 @@ static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
     return len;
 }
 
-static int socket_close(void *opaque)
+static int fd_close(void *opaque)
 {
-    QEMUFileSocket *s = opaque;
+    QEMUFileFD *s = opaque;
     g_free(s);
     return 0;
 }
@@ -276,6 +276,7 @@ QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, 
 				 NULL, NULL, NULL);
     }
+    s->file->fd = fileno(stdio_file);
     return s->file;
 }
 
@@ -291,17 +292,6 @@ QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
     return qemu_popen(popen_file, mode);
 }
 
-int qemu_stdio_fd(QEMUFile *f)
-{
-    QEMUFileStdio *p;
-    int fd;
-
-    p = (QEMUFileStdio *)f->opaque;
-    fd = fileno(p->stdio_file);
-
-    return fd;
-}
-
 QEMUFile *qemu_fdopen(int fd, const char *mode)
 {
     QEMUFileStdio *s;
@@ -325,6 +315,7 @@ QEMUFile *qemu_fdopen(int fd, const char *mode)
         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, 
 				 NULL, NULL, NULL);
     }
+    s->file->fd = fd;
     return s->file;
 
 fail:
@@ -334,11 +325,11 @@ fail:
 
 QEMUFile *qemu_fopen_socket(int fd)
 {
-    QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
+    QEMUFileFD *s = g_malloc0(sizeof(QEMUFileFD));
 
-    s->fd = fd;
-    s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, 
+    s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, fd_close,
 			     NULL, NULL, NULL);
+    s->file->fd = fd;
     return s->file;
 }
 
@@ -381,6 +372,7 @@ QEMUFile *qemu_fopen(const char *filename, const char *mode)
         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, 
 			       NULL, NULL, NULL);
     }
+    s->file->fd = fileno(s->stdio_file);
     return s->file;
 fail:
     g_free(s);
@@ -431,10 +423,16 @@ QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
     f->set_rate_limit = set_rate_limit;
     f->get_rate_limit = get_rate_limit;
     f->is_write = 0;
+    f->fd = -1;
 
     return f;
 }
 
+int qemu_file_fd(QEMUFile *f)
+{
+    return f->fd;
+}
+
 int qemu_file_get_error(QEMUFile *f)
 {
     return f->last_error;
-- 
1.7.10.4

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