[Xen-devel] [PATCH] tools/xc: update tty detection in stdiostream_progress

[Olaf Hering <olaf@xxxxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1361561865 -3600
# Node ID 1b36a6c0a956cc94ddb0024099bf60fb4cbe02d7
# Parent  dc086ced6b0c7ecf21e56155f42fb16dabe39097
tools/xc: update tty detection in stdiostream_progress

As suggested by IanJ:
Check isatty only once to preserve the errno of ->progress users, and to
reduce the noice in strace output.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

diff -r dc086ced6b0c -r 1b36a6c0a956 tools/libxc/xtl_logger_stdio.c
--- a/tools/libxc/xtl_logger_stdio.c
+++ b/tools/libxc/xtl_logger_stdio.c
@@ -35,6 +35,7 @@ struct xentoollog_logger_stdiostream {
     xentoollog_level min_level;
     unsigned flags;
     int progress_erase_len, progress_last_percent;
+    int isatty;
 };
 
 static void progress_erase(xentoollog_logger_stdiostream *lg) {
@@ -118,7 +119,7 @@ static void stdiostream_progress(struct 
 
     lg->progress_last_percent = percent;
 
-    if (isatty(fileno(lg->f)) <= 0) {
+    if (!lg->isatty) {
         stdiostream_message(logger_in, this_level, context,
                             "%s: %lu/%lu  %3d%%",
                             doing_what, done, total, percent);
@@ -166,6 +167,7 @@ xentoollog_logger_stdiostream *xtl_creat
     newlogger.f = f;
     newlogger.min_level = min_level;
     newlogger.flags = flags;
+    newlogger.isatty = isatty(fileno(lg->f)) > 0;
 
     if (newlogger.flags & XTL_STDIOSTREAM_SHOW_DATE) tzset();
 

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