From a14832ff977e78d1982cdf78cdabb1f2320d9ac8 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sun, 7 Jun 2009 17:58:23 +0200 Subject: [PATCH] perf report: Print more expressive message in case of file open error Before: $ perf report failed to open file: No such file or directory After: $ perf report failed to open file: perf.data (try 'perf record' first) Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo LKML-Reference: Signed-off-by: Ingo Molnar --- tools/perf/builtin-report.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 242e09f..f053a74 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -1120,7 +1120,10 @@ static int __cmd_report(void) input = open(input_name, O_RDONLY); if (input < 0) { - perror("failed to open file"); + fprintf(stderr, " failed to open file: %s", input_name); + if (!strcmp(input_name, "perf.data")) + fprintf(stderr, " (try 'perf record' first)"); + fprintf(stderr, "\n"); exit(-1); } -- 1.8.2.3