rt_device_write/read return data type as rt_ssize_t

rt_ssize_t can give negative error code, which follows the unix style correctly

4 files changed, 7 insertions, 7 deletions

diff --git a/components/utilities/rt-link/src/rtlink.c b/components/utilities/rt-link/src/rtlink.c
index e4aa08824d..48d91fc94b 100644
--- a/components/utilities/rt-link/src/rtlink.c
+++ b/components/utilities/rt-link/src/rtlink.c
@@ -208,7 +208,7 @@ static void rt_link_service_send_finish(rt_link_err_e err)
     }
 }
 
-static rt_size_t frame_send(struct rt_link_frame *frame)
+static rt_ssize_t frame_send(struct rt_link_frame *frame)
 {
     rt_size_t length = 0;
     rt_uint8_t *data = RT_NULL;
diff --git a/components/utilities/rt-link/src/rtlink_dev.c b/components/utilities/rt-link/src/rtlink_dev.c
index f15294fc4d..24c45585ea 100644
--- a/components/utilities/rt-link/src/rtlink_dev.c
+++ b/components/utilities/rt-link/src/rtlink_dev.c
@@ -265,7 +265,7 @@ rt_err_t  rt_link_dev_close(rt_device_t dev)
     return rt_link_service_detach(&rtlink->service);
 }
 
-rt_size_t rt_link_dev_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
+rt_ssize_t rt_link_dev_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
 {
     RT_ASSERT(dev != RT_NULL);
     RT_ASSERT(buffer != RT_NULL);
@@ -305,7 +305,7 @@ rt_size_t rt_link_dev_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_
     return read_len;
 }
 
-rt_size_t rt_link_dev_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+rt_ssize_t rt_link_dev_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
 {
     RT_ASSERT(dev != RT_NULL);
     RT_ASSERT(buffer != RT_NULL);
diff --git a/components/utilities/rt-link/src/rtlink_hw.c b/components/utilities/rt-link/src/rtlink_hw.c
index 4a56ea4893..847100912e 100644
--- a/components/utilities/rt-link/src/rtlink_hw.c
+++ b/components/utilities/rt-link/src/rtlink_hw.c
@@ -45,7 +45,7 @@ struct rt_link_receive_buffer *rt_link_hw_buffer_init(void *parameter)
     return rx_buffer;
 }
 
-static rt_size_t rt_link_hw_buffer_write(void *data, rt_size_t count)
+static rt_ssize_t rt_link_hw_buffer_write(void *data, rt_size_t count)
 {
     rt_size_t surplus = 0;
     if (rx_buffer == RT_NULL)
diff --git a/components/utilities/ymodem/ymodem.c b/components/utilities/ymodem/ymodem.c
index efbb70defd..f554d81f98 100644
--- a/components/utilities/ymodem/ymodem.c
+++ b/components/utilities/ymodem/ymodem.c
@@ -121,7 +121,7 @@ static enum rym_code _rym_read_code(
 }
 
 /* the caller should at least alloc _RYM_STX_PKG_SZ buffer */
-static rt_size_t _rym_read_data(
+static rt_ssize_t _rym_read_data(
     struct rym_ctx *ctx,
     rt_size_t len)
 {
@@ -180,13 +180,13 @@ static rt_err_t _rym_send_packet(
     return RT_EOK;
 }
 
-static rt_size_t _rym_putchar(struct rym_ctx *ctx, rt_uint8_t code)
+static rt_ssize_t _rym_putchar(struct rym_ctx *ctx, rt_uint8_t code)
 {
     rt_device_write(ctx->dev, 0, &code, sizeof(code));
     return 1;
 }
 
-static rt_size_t _rym_getchar(struct rym_ctx *ctx)
+static rt_ssize_t _rym_getchar(struct rym_ctx *ctx)
 {
     rt_uint8_t getc_ack;