[v5,33/40] trace-cmd: Copy CPU count in tracecmd_copy

Commit Message

Tzvetomir Stoyanov (VMware) June 10, 2021, 11:34 a.m. UTC

Extend the tracecmd_copy() API to support copying of CPU count from
input to output trace hanlder.

Signed-off-by: Tzvetomir Stoyanov (VMware) <[e-mail]>
---
 lib/trace-cmd/trace-input.c  | 30 ++++++++++++++++++++++++++++++
 lib/trace-cmd/trace-output.c |  2 +-
 2 files changed, 31 insertions(+), 1 deletion(-)

Patch

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index 74d1ebf7..289102bf 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -4043,6 +4043,23 @@  error:
 	return -1;
 }
 
+static int copy_cpu_count(struct tracecmd_input *in_handle, struct tracecmd_output *out_handle)
+{
+	unsigned int size;
+
+	if (!check_in_state(in_handle, TRACECMD_FILE_CPU_COUNT) ||
+	    !check_out_state(out_handle, TRACECMD_FILE_CPU_COUNT))
+		return -1;
+
+	if (read_copy_size4(in_handle, out_handle, &size) < 0)
+		return -1;
+
+	in_handle->file_state = TRACECMD_FILE_CPU_COUNT;
+	out_set_file_state(out_handle, in_handle->file_state);
+
+	return 0;
+}
+
 /**
  * tracecmd_copy_headers - Copy headers from a tracecmd_input handle to a file descriptor
  * @in_handle: input handle for the trace.dat file to copy from.
@@ -4135,6 +4152,19 @@  int tracecmd_copy_headers(struct tracecmd_input *in_handle,
 			return 0;
 
 		ret = copy_command_lines(in_handle, out_handle);
+		if (ret < 0)
+			goto out;
+
+		/* fallthrough */
+	case TRACECMD_FILE_CPU_COUNT:
+		if (end_state <= in_handle->file_state)
+			return 0;
+
+		ret = copy_cpu_count(in_handle, out_handle);
+		if (ret < 0)
+			goto out;
+
+		/* fallthrough */
 	default:
 		break;
 	}
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index e3b018aa..a3d0f037 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -1949,7 +1949,7 @@  struct tracecmd_output *tracecmd_copy(struct tracecmd_input *ihandle, const char
 	if (!handle)
 		return NULL;
 
-	fstate = state > TRACECMD_FILE_CMD_LINES ? TRACECMD_FILE_CMD_LINES : state;
+	fstate = state > TRACECMD_FILE_CPU_COUNT ? TRACECMD_FILE_CPU_COUNT : state;
 	if (tracecmd_copy_headers(ihandle, handle, 0, fstate) < 0)
 		goto out_free;