linux-kernel - [PATCH] rtla: Fix exit status when returning from calls to usage()

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Date:   Thu,  3 Nov 2022 09:57:42 -0400
From:   John Kacur <jkacur@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveria <bristot@...hat.com>
Cc:     linux-trace-devel@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Clark Williams <williams@...hat.com>,
        Chang Yin <cyin@...hat.com>, John Kacur <jkacur@...hat.com>
Subject: [PATCH] rtla: Fix exit status when returning from calls to usage()

rtla_usage(), osnoise_usage() and timerlat_usage() all exit with an
error status

However when these are called from help, they should exit with a
non-error status.

Fix this by passing the exit status to the functions

Note, although we remove the subsequent call to exit after calling
usage, we leave it in at the end of a function to supress the compiler
warning "control reaches end of a non-void function"

Signed-off-by: John Kacur <jkacur@...hat.com>
---
 tools/tracing/rtla/src/osnoise.c  |  9 ++++-----
 tools/tracing/rtla/src/rtla.c     | 12 +++++-------
 tools/tracing/rtla/src/timerlat.c |  9 ++++-----
 3 files changed, 13 insertions(+), 17 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise.c b/tools/tracing/rtla/src/osnoise.c
index b8ec6c15bccb..4dee343909b1 100644
--- a/tools/tracing/rtla/src/osnoise.c
+++ b/tools/tracing/rtla/src/osnoise.c
@@ -903,7 +903,7 @@ struct osnoise_tool *osnoise_init_trace_tool(char *tracer)
 	return NULL;
 }
 
-static void osnoise_usage(void)
+static void osnoise_usage(int err)
 {
 	int i;
 
@@ -923,7 +923,7 @@ static void osnoise_usage(void)
 
 	for (i = 0; msg[i]; i++)
 		fprintf(stderr, "%s\n", msg[i]);
-	exit(1);
+	exit(err);
 }
 
 int osnoise_main(int argc, char *argv[])
@@ -941,8 +941,7 @@ int osnoise_main(int argc, char *argv[])
 	}
 
 	if ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0)) {
-		osnoise_usage();
-		exit(0);
+		osnoise_usage(0);
 	} else if (strncmp(argv[1], "-", 1) == 0) {
 		/* the user skipped the tool, call the default one */
 		osnoise_top_main(argc, argv);
@@ -956,6 +955,6 @@ int osnoise_main(int argc, char *argv[])
 	}
 
 usage:
-	osnoise_usage();
+	osnoise_usage(1);
 	exit(1);
 }
diff --git a/tools/tracing/rtla/src/rtla.c b/tools/tracing/rtla/src/rtla.c
index 09bd21b8af81..52e8f1825281 100644
--- a/tools/tracing/rtla/src/rtla.c
+++ b/tools/tracing/rtla/src/rtla.c
@@ -14,7 +14,7 @@
 /*
  * rtla_usage - print rtla usage
  */
-static void rtla_usage(void)
+static void rtla_usage(int err)
 {
 	int i;
 
@@ -33,7 +33,7 @@ static void rtla_usage(void)
 
 	for (i = 0; msg[i]; i++)
 		fprintf(stderr, "%s\n", msg[i]);
-	exit(1);
+	exit(err);
 }
 
 /*
@@ -70,11 +70,9 @@ int main(int argc, char *argv[])
 		goto usage;
 
 	if (strcmp(argv[1], "-h") == 0) {
-		rtla_usage();
-		exit(0);
+		rtla_usage(0);
 	} else if (strcmp(argv[1], "--help") == 0) {
-		rtla_usage();
-		exit(0);
+		rtla_usage(0);
 	}
 
 	retval = run_command(argc, argv, 1);
@@ -82,6 +80,6 @@ int main(int argc, char *argv[])
 		exit(0);
 
 usage:
-	rtla_usage();
+	rtla_usage(1);
 	exit(1);
 }
diff --git a/tools/tracing/rtla/src/timerlat.c b/tools/tracing/rtla/src/timerlat.c
index 97abbf494fee..21cdcc5c4a29 100644
--- a/tools/tracing/rtla/src/timerlat.c
+++ b/tools/tracing/rtla/src/timerlat.c
@@ -14,7 +14,7 @@
 
 #include "timerlat.h"
 
-static void timerlat_usage(void)
+static void timerlat_usage(int err)
 {
 	int i;
 
@@ -34,7 +34,7 @@ static void timerlat_usage(void)
 
 	for (i = 0; msg[i]; i++)
 		fprintf(stderr, "%s\n", msg[i]);
-	exit(1);
+	exit(err);
 }
 
 int timerlat_main(int argc, char *argv[])
@@ -52,8 +52,7 @@ int timerlat_main(int argc, char *argv[])
 	}
 
 	if ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0)) {
-		timerlat_usage();
-		exit(0);
+		timerlat_usage(0);
 	} else if (strncmp(argv[1], "-", 1) == 0) {
 		/* the user skipped the tool, call the default one */
 		timerlat_top_main(argc, argv);
@@ -67,6 +66,6 @@ int timerlat_main(int argc, char *argv[])
 	}
 
 usage:
-	timerlat_usage();
+	timerlat_usage(1);
 	exit(1);
 }
-- 
2.38.1