[PATCH 3/8] trace-cmd library: Copy CPU count between trace files

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

The tracecmd_copy_headers() API should be able to copy CPU count also,
as it is part of the headers.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 lib/trace-cmd/trace-input.c | 40 +++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index e4fdc534..c3d7075f 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -4752,6 +4752,33 @@ error:
 	return -1;
 }
 
+static int copy_cpu_count(struct tracecmd_input *in_handle, struct tracecmd_output *out_handle)
+{
+	unsigned int cpus;
+
+	if (!check_in_state(in_handle, TRACECMD_FILE_CPU_COUNT) ||
+	    !check_out_state(out_handle, TRACECMD_FILE_CPU_COUNT))
+		return -1;
+
+	if (!HAS_SECTIONS(in_handle)) {
+		if (read4(in_handle, &cpus))
+			return -1;
+	} else {
+		cpus = in_handle->max_cpu;
+	}
+
+	if (tracecmd_get_out_file_version(out_handle) < FILE_VERSION_SECTIONS) {
+		cpus = tep_read_number(in_handle->pevent, &cpus, 4);
+		if (do_write_check(out_handle, &cpus, 4))
+			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.
@@ -4850,6 +4877,19 @@ 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;
 	}
-- 
2.31.1