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authorMilian Wolff <milian.wolff@kdab.com>2017-09-11 13:14:22 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-09-12 12:48:54 -0300
commit3192f1ed3dd3a6883d5ae31bf2ff69984ea0fd54 (patch)
tree3c404a234102966c8e0ba5a10b2b1d795353d4e9 /tools/perf
parentcba225d6eeaf00bd8181a851fbaa7b8716337e0b (diff)
perf tools: Support running perf binaries with a dash in their name
Previously the part behind "perf-" was interpreted as an internal perf command. If the suffix could not be handled, the execution was stopped. This makes it impossible to launch perf binaries that got renamed to have the `perf-` prefix. This is e.g. the case for appimages (e.g. "perf-x86_64.AppImage"), but would also apply to all other scenarios where users symlink or rename perf themselves: Status quo with the broken behavior: $ ln -s ./perf ./perf-custom-suffix $ ./perf-custom-suffix list cannot handle custom-suffix internally$ Also note the missing newline at the end of the error message. With this patch applied, the above works properly: $ ./perf-custom-suffix list List of pre-defined events (to be used in -e): ... Signed-off-by: Milian Wolff <milian.wolff@kdab.com> Acked-by: David Ahern <dsahern@gmail.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Yao Jin <yao.jin@linux.intel.com> Link: http://lkml.kernel.org/r/20170911111422.31903-1-milian.wolff@kdab.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/perf.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index e0279babe0c0..2f19e03c5c40 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -467,15 +467,21 @@ int main(int argc, const char **argv)
* - cannot execute it externally (since it would just do
* the same thing over again)
*
- * So we just directly call the internal command handler, and
- * die if that one cannot handle it.
+ * So we just directly call the internal command handler. If that one
+ * fails to handle this, then maybe we just run a renamed perf binary
+ * that contains a dash in its name. To handle this scenario, we just
+ * fall through and ignore the "xxxx" part of the command string.
*/
if (strstarts(cmd, "perf-")) {
cmd += 5;
argv[0] = cmd;
handle_internal_command(argc, argv);
- fprintf(stderr, "cannot handle %s internally", cmd);
- goto out;
+ /*
+ * If the command is handled, the above function does not
+ * return undo changes and fall through in such a case.
+ */
+ cmd -= 5;
+ argv[0] = cmd;
}
if (strstarts(cmd, "trace")) {
#ifdef HAVE_LIBAUDIT_SUPPORT