Userland: Move command-line utilities to Userland/Utilities/

Userland/Utilities/syscall.cpp

@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <getopt.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#if !defined __ENUMERATE_SYSCALL
+#    define __ENUMERATE_SYSCALL(x) SC_##x,
+#endif
+
+#define SC_NARG 4
+
+Syscall::Function syscall_table[] = {
+    ENUMERATE_SYSCALLS(__ENUMERATE_SYSCALL)
+};
+
+FlatPtr arg[SC_NARG];
+char buf[BUFSIZ];
+
+FlatPtr parse(char* s);
+
+int main(int argc, char** argv)
+{
+    int oflag;
+    int opt;
+    while ((opt = getopt(argc, argv, "olh")) != -1) {
+        switch (opt) {
+        case 'o':
+            oflag = 1;
+            break;
+        case 'l':
+            for (auto sc : syscall_table) {
+                fprintf(stdout, "%s ", Syscall::to_string(sc));
+            }
+            return EXIT_SUCCESS;
+        case 'h':
+            fprintf(stderr, "usage: \tsyscall [-o] [-l] [-h] <syscall-name> <args...> [buf==BUFSIZ buffer]\n");
+            fprintf(stderr, "\tsyscall write 1 hello 5\n");
+            fprintf(stderr, "\tsyscall -o read 0 buf 5\n");
+            fprintf(stderr, "\tsyscall sleep 3\n");
+            break;
+        default:
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    if (optind >= argc) {
+        fprintf(stderr, "No entry specified\n");
+        return -1;
+    }
+
+    for (int i = 0; i < argc - optind; i++) {
+        arg[i] = parse(argv[i + optind]);
+    }
+
+    for (auto sc : syscall_table) {
+        if (strcmp(Syscall::to_string(sc), (char*)arg[0]) == 0) {
+            int rc = syscall(sc, arg[1], arg[2], arg[3]);
+            if (rc == -1) {
+                perror("syscall");
+            } else {
+                if (oflag)
+                    fwrite(buf, 1, sizeof(buf), stdout);
+            }
+
+            fprintf(stderr, "Syscall return: %d\n", rc);
+            return 0;
+        }
+    }
+
+    fprintf(stderr, "Invalid syscall entry %s\n", (char*)arg[0]);
+    return -1;
+}
+
+FlatPtr parse(char* s)
+{
+    char* t;
+    FlatPtr l;
+
+    if (strcmp(s, "buf") == 0) {
+        return (FlatPtr)buf;
+    }
+
+    l = strtoul(s, &t, 0);
+    if (t > s && *t == 0) {
+        return l;
+    }
+
+    return (FlatPtr)s;
+}