[Qemu-devel] [PATCH v7 11/11] trace: [tracetool] Add error-reporting functions

["Lluís Vilanova" <vilanova@ac.upc.edu>]

Unifies the print+exit sequence into a single 'error' call.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
---
 scripts/tracetool.py |   30 +++++++++++++++++-------------
 1 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/scripts/tracetool.py b/scripts/tracetool.py
index bba4c54a..628cb75 100755
--- a/scripts/tracetool.py
+++ b/scripts/tracetool.py
@@ -39,6 +39,15 @@ Options:
 '''
     sys.exit(1)
 
+
+def error_write(*lines):
+    sys.stderr.writelines(lines)
+
+def error(*lines):
+    error_write(*lines)
+    sys.exit(1)
+
+
 def trace_h_begin(events):
     print '''#ifndef TRACE_H
 #define TRACE_H
@@ -419,7 +428,8 @@ def main():
         opts, args = getopt.getopt(sys.argv[1:], short_options, long_options)
     except getopt.GetoptError, err:
         # print help information and exit:
-        print str(err) # will print something like "option -a not recognized"
+        # will print something like "option -a not recognized"
+        error_write(str(err) + "\n\n")
         usage()
         sys.exit(2)
     for opt, arg in opts:
@@ -450,8 +460,7 @@ def main():
             else:
                 sys.exit(1)
         else:
-            #assert False, "unhandled option"
-            print "unhandled option: ", opt
+            error_write("unhandled option: ", opt, "\n\n")
             usage()
 
     if backend == "" or output == "":
@@ -459,22 +468,17 @@ def main():
         sys.exit(0)
 
     if backend != 'dtrace' and output == 'd':
-        print 'DTrace probe generator not applicable to %s backend' % backend
-        sys.exit(1)
+        error('DTrace probe generator not applicable to %s backend\n' % backend)
 
     if output == 'stap':
         if backend != "dtrace":
-            print 'SystemTAP tapset generator not applicable to %s backend' % backend
-            sys.exit(1)
+            error('SystemTAP tapset generator not applicable to %s backend\n' % backend)
         if binary == "":
-            print '--binary is required for SystemTAP tapset generator'
-            sys.exit(1)
+            error('--binary is required for SystemTAP tapset generator\n')
         if not probeprefix and  not targettype:
-            print '--target-type is required for SystemTAP tapset generator'
-            sys.exit(1)
+            error('--target-type is required for SystemTAP tapset generator\n')
         if not probeprefix and  not targetarch:
-            print '--target-arch is required for SystemTAP tapset generator'
-            sys.exit(1)
+            error('--target-arch is required for SystemTAP tapset generator\n')
         if probeprefix == "":
             probeprefix = 'qemu.' + targettype + '.' + targetarch