From 4e8a506f8aec09642f2da4c50cf67c163aacbefd Mon Sep 17 00:00:00 2001
From: Yuta Imazu <yuta.imazu@gmail.com>
Date: Tue, 18 Jun 2024 08:15:13 +0900
Subject: [PATCH] userland: add "mkfifo" command

---
 userland/Makefile       |  2 ++
 userland/lib/sys/stat.c |  6 ++++++
 userland/lib/sys/stat.h |  1 +
 userland/mkfifo.c       | 16 ++++++++++++++++
 4 files changed, 25 insertions(+)
 create mode 100644 userland/lib/sys/stat.c
 create mode 100644 userland/mkfifo.c

diff --git a/userland/Makefile b/userland/Makefile
index 16b5a686..c653d948 100644
--- a/userland/Makefile
+++ b/userland/Makefile
@@ -24,6 +24,7 @@ BIN_TARGET_NAMES := \
 	ls \
 	mandelbrot \
 	mkdir \
+	mkfifo \
 	mount \
 	mouse-cursor \
 	moused \
@@ -63,6 +64,7 @@ LIB_OBJS := \
 	lib/stdio.o \
 	lib/stdlib.o \
 	lib/string.o \
+	lib/sys/stat.o \
 	lib/syscall.o \
 	lib/time.o \
 	lib/unistd.o
diff --git a/userland/lib/sys/stat.c b/userland/lib/sys/stat.c
new file mode 100644
index 00000000..eea6c5fd
--- /dev/null
+++ b/userland/lib/sys/stat.c
@@ -0,0 +1,6 @@
+#include "stat.h"
+#include <unistd.h>
+
+int mkfifo(const char* pathname, mode_t mode) {
+    return mknod(pathname, mode | S_IFIFO, 0);
+}
diff --git a/userland/lib/sys/stat.h b/userland/lib/sys/stat.h
index 703ac2f2..8dd43914 100644
--- a/userland/lib/sys/stat.h
+++ b/userland/lib/sys/stat.h
@@ -4,3 +4,4 @@
 
 int stat(const char* pathname, struct stat* buf);
 int mkdir(const char* pathname, mode_t mode);
+int mkfifo(const char* pathname, mode_t mode);
diff --git a/userland/mkfifo.c b/userland/mkfifo.c
new file mode 100644
index 00000000..4e12f957
--- /dev/null
+++ b/userland/mkfifo.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+int main(int argc, char* const argv[]) {
+    if (argc != 2) {
+        dprintf(STDERR_FILENO, "Usage: mkfifo NAME\n");
+        return EXIT_FAILURE;
+    }
+    if (mkfifo(argv[1], 0) < 0) {
+        perror("mkfifo");
+        return EXIT_FAILURE;
+    }
+    return EXIT_SUCCESS;
+}