vfs: Implement syscalls

syscalls/process.c

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: ISC
+
+#include <zinnia/panic.h>
+#include <zinnia/syscall.h>
+#include "internal.h"
+
+struct syscall_ret sys_exit(int err) {
+    struct syscall_ret ret = {};
+
+    ret.error = ENOSYS;
+
+    panic("sys::exit() not implemented!\n");
+
+    return ret;
+}
+
+struct syscall_ret sys_umask(mode_t mask) {
+    struct syscall_ret ret = {};
+
+    struct process* proc = self();
+    mutex_lock(&proc->lock);
+    ret.value = proc->umask;
+    proc->umask = mask & 0777;
+    mutex_unlock(&proc->lock);
+    return ret;
+}