Userland: add mkfifo(1)

Author: https://github.com/petelliott
Commit: https://github.com/SerenityOS/serenity/commit/b44a7f68cd6
Pull-request: https://github.com/SerenityOS/serenity/pull/2829
Issue: https://github.com/SerenityOS/serenity/issues/203
Reviewed-by: https://github.com/bugaevc

Userland/mkfifo.cpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
+ * 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 <LibCore/ArgsParser.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+    if (pledge("stdio dpath", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    mode_t mode = 0666;
+    Vector<const char*> paths;
+
+    Core::ArgsParser args_parser;
+    // FIXME: add -m for file modes
+    args_parser.add_positional_argument(paths, "Paths of FIFOs to create", "paths");
+    args_parser.parse(argc, argv);
+
+    int exit_code = 0;
+
+    for (auto path : paths) {
+        if (mkfifo(path, mode) < 0) {
+            perror("mkfifo");
+            exit_code = 1;
+        }
+    }
+
+    return exit_code;
+}