rtla/src/rtla.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
0004  */
0005
0006 #include <getopt.h>
0007 #include <stdlib.h>
0008 #include <string.h>
0009 #include <stdio.h>
0010
0011 #include "osnoise.h"
0012 #include "timerlat.h"
0013
0014 /*
0015  * rtla_usage - print rtla usage
0016  */
0017 static void rtla_usage(void)
0018 {
0019     int i;
0020
0021     static const char *msg[] = {
0022         "",
0023         "rtla version " VERSION,
0024         "",
0025         "  usage: rtla COMMAND ...",
0026         "",
0027         "  commands:",
0028         "     osnoise  - gives information about the operating system noise (osnoise)",
0029         "     timerlat - measures the timer irq and thread latency",
0030         "",
0031         NULL,
0032     };
0033
0034     for (i = 0; msg[i]; i++)
0035         fprintf(stderr, "%s\n", msg[i]);
0036     exit(1);
0037 }
0038
0039 /*
0040  * run_command - try to run a rtla tool command
0041  *
0042  * It returns 0 if it fails. The tool's main will generally not
0043  * return as they should call exit().
0044  */
0045 int run_command(int argc, char **argv, int start_position)
0046 {
0047     if (strcmp(argv[start_position], "osnoise") == 0) {
0048         osnoise_main(argc-start_position, &argv[start_position]);
0049         goto ran;
0050     } else if (strcmp(argv[start_position], "timerlat") == 0) {
0051         timerlat_main(argc-start_position, &argv[start_position]);
0052         goto ran;
0053     }
0054
0055     return 0;
0056 ran:
0057     return 1;
0058 }
0059
0060 int main(int argc, char *argv[])
0061 {
0062     int retval;
0063
0064     /* is it an alias? */
0065     retval = run_command(argc, argv, 0);
0066     if (retval)
0067         exit(0);
0068
0069     if (argc < 2)
0070         goto usage;
0071
0072     if (strcmp(argv[1], "-h") == 0) {
0073         rtla_usage();
0074         exit(0);
0075     } else if (strcmp(argv[1], "--help") == 0) {
0076         rtla_usage();
0077         exit(0);
0078     }
0079
0080     retval = run_command(argc, argv, 1);
0081     if (retval)
0082         exit(0);
0083
0084 usage:
0085     rtla_usage();
0086     exit(1);
0087 }