libc: Add support for mkdir()

apps/src/init.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/stat.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
@@ -137,13 +138,21 @@ int main()
         return 1;
     }
 
-    fprintf(new_stderr, "Bye!\n");
+    fprintf(new_stderr, "Bye!\n\n");
 
     fclose(new_stderr);
 
-    execv("/bin/sym", NULL);
+    const char* pathname = "/etc";
 
-    perror("execv"); // If we're here, execv failed
+    printf("Creating directory %s\n", pathname);
+
+    if (mkdir(pathname, 0) < 0)
+    {
+        perror("mkdir");
+        return 1;
+    }
+
+    printf("Success!!");
 
     return 1;
 }

libs/libc/include/luna/syscall.h

@@ -17,6 +17,7 @@
 #define SYS_fcntl 13
 #define SYS_mprotect 14
 #define SYS_clock 15
+#define SYS_mkdir 17
 
 #ifndef __want_syscalls
 #ifdef __cplusplus

libs/libc/include/sys/stat.h

@@ -0,0 +1,18 @@
+#ifndef _SYS_STAT_H
+#define _SYS_STAT_H
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Creates a new directory at the path pathname. FIXME: For now, mode is ignored. */
+    int mkdir(const char* pathname, mode_t mode);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libs/libc/include/sys/types.h

@@ -13,4 +13,7 @@ typedef long int ssize_t;
 /* The type of an offset into a file. */
 typedef long int off_t;
 
+/* The type of a file's mode. */
+typedef unsigned short mode_t;
+
 #endif

libs/libc/src/fcntl.cpp

@@ -1,5 +1,6 @@
 #include <fcntl.h>
 #include <stdarg.h>
+#include <stdint.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
@@ -14,12 +15,7 @@ extern "C"
     {
         va_list ap;
         va_start(ap, cmd);
-        long result;
+        long result = syscall(SYS_fcntl, fd, cmd, va_arg(ap, uintptr_t));
-        switch (cmd)
-        {
-        case F_DUPFD: result = syscall(SYS_fcntl, fd, cmd, va_arg(ap, int)); break;
-        default: result = syscall(SYS_fcntl, fd, cmd, 0); break;
-        }
         va_end(ap);
         return (int)result;
     }

libs/libc/src/sys/stat.cpp

@@ -0,0 +1,11 @@
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+extern "C"
+{
+    int mkdir(const char* pathname, mode_t)
+    {
+        return (int)syscall(SYS_mkdir, pathname);
+    }
+}

libs/libc/src/unistd.cpp

@@ -38,6 +38,7 @@ extern "C"
         case SYS_exit:
         case SYS_close:
         case SYS_exec:
+        case SYS_mkdir:
         case SYS_sleep: result = __luna_syscall1(number, va_arg(ap, arg)); break;
         case SYS_munmap:
         case SYS_open: {