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perf report: Print more expressive message in case of file open error

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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 <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-06-07 17:58:23 +02:00
parent 30c806a094
commit a14832ff97
1 changed files with 4 additions and 1 deletions
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5
tools/perf/builtin-report.c
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@ -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);
}