Kernel/LibC: add SYS_STAT and stat(), lstat()

libc/CMakeLists.txt

@@ -10,6 +10,7 @@ set(LIBC_SOURCES
 	stdio.cpp
 	stdlib.cpp
 	string.cpp
+	sys/stat.cpp
 	sys/wait.cpp
 	termios.cpp
 	unistd.cpp

libc/include/sys/syscall.h

@@ -22,6 +22,7 @@ __BEGIN_DECLS
 #define SYS_EXEC 15
 #define SYS_REALLOC 16
 #define SYS_WAIT 17
+#define SYS_STAT 18
 
 __END_DECLS
 

libc/sys/stat.cpp

@@ -0,0 +1,14 @@
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int lstat(const char* __restrict path, struct stat* __restrict buf)
+{
+    return syscall(SYS_STAT, path, buf, O_RDONLY | O_NOFOLLOW);
+}
+
+int stat(const char* __restrict path, struct stat* __restrict buf)
+{
+    return syscall(SYS_STAT, path, buf, O_RDONLY);
+}

libc/unistd.cpp

@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/stat.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
@@ -145,6 +146,14 @@ long syscall(long syscall, ...)
 			ret = Kernel::syscall(SYS_WAIT, pid, (uintptr_t)stat_loc, options);
 			break;
 		}
+		case SYS_STAT:
+		{
+			const char* path = va_arg(args, const char*);
+			struct stat* buf = va_arg(args, struct stat*);
+			int flags = va_arg(args, int);
+			ret = Kernel::syscall(SYS_STAT, (uintptr_t)path, (uintptr_t)buf, flags);
+			break;
+		}
 		default:
 			puts("LibC: Unhandeled syscall");
 			ret = -ENOSYS;