liblitmus essential tools

liblitmus should consist  only of the litmus library and the essential
tools.

1 files changed, 83 insertions, 0 deletions

diff --git a/rt_launch.c b/rt_launch.c
new file mode 100644
index 0000000..31e6447
--- /dev/null
+++ b/rt_launch.c
@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "litmus.h"
+
+typedef struct {
+        char * exec_path;
+        char ** argv;
+} startup_info_t;
+
+
+int launch(void *task_info_p) {
+        startup_info_t *info = (startup_info_t*) task_info_p;
+        int ret;
+        ret = execv(info->exec_path, info->argv);
+        perror("execv failed");
+        return ret;
+}
+
+void usage(char *error) {
+        fprintf(stderr, "%s\nUsage: launch_rt [-c {hrt|srt|be}] [-p <cpu>]"
+                "<wcet> <period> program arg1 arg2 ...\n",
+                error);
+        exit(1);
+}
+
+#define OPTSTR "p:c:"
+
+int main(int argc, char** argv) 
+{
+        int ret;
+        int wcet;
+        int period;
+        int cpu = 0;
+        int opt;
+        startup_info_t info;
+        task_class_t class = RT_CLASS_HARD;
+        
+        while ((opt = getopt(argc, argv, OPTSTR)) != -1) {
+                switch (opt) {
+                case 'p':
+                        cpu = atoi(optarg);
+                        break;
+                case 'c':
+                        class = str2class(optarg);
+                        if (class == -1)
+                                usage("Unknown task class.");
+                        break;
+
+                case ':':
+                        usage("Argument missing.");
+                        break;
+                case '?':
+                default:
+                        usage("Unknown flag.");
+                        break;
+                }
+        }
+
+        if (argc - optind < 3)
+        {
+                printf("argc: %d optind: %d\n", argc, optind);
+                usage("Arguments missing.");       
+        }
+        wcet   = atoi(argv[optind + 0]);
+        period = atoi(argv[optind + 1]);
+        if (wcet <= 0)
+                usage("The worst-case execution time must be a positive number.");
+        if (period <= 0)
+                usage("The period must be a positive number.");
+        if (wcet > period) {
+                usage("The worst-case execution time must not exceed the period.");
+        }
+        info.exec_path = argv[optind + 2];
+        info.argv      = argv + optind + 2;
+        ret = __create_rt_task(launch, &info, cpu, wcet, period, class);
+        if (ret < 0) {
+                perror("Could not create rt child process");
+        }
+
+        return 0;       
+}