From 89e57f0578865526c9cf4e280a53d12a414168a6 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Fri, 30 Sep 2022 16:39:19 -0300
Subject: [PATCH] syscalls: chdir

---
 src/arch/x86_64/syscall.asm |  4 ++-
 src/sys/syscalls/chdir.c    | 50 +++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 src/sys/syscalls/chdir.c

diff --git a/src/arch/x86_64/syscall.asm b/src/arch/x86_64/syscall.asm
index 24af9504..b00ffdba 100644
--- a/src/arch/x86_64/syscall.asm
+++ b/src/arch/x86_64/syscall.asm
@@ -23,7 +23,8 @@ extern syscall_fcntl
 extern syscall_getpid
 extern syscall_getdirent
 extern syscall_ioctl
-func_count equ 22
+extern syscall_chdir
+func_count equ 23
 
 
 func_table:
@@ -49,6 +50,7 @@ func_table:
 	dq syscall_getpid
 	dq syscall_getdirent
 	dq syscall_ioctl
+	dq syscall_chdir
 section .text
 global asm_syscall_entry
 
diff --git a/src/sys/syscalls/chdir.c b/src/sys/syscalls/chdir.c
new file mode 100644
index 00000000..33ec04a4
--- /dev/null
+++ b/src/sys/syscalls/chdir.c
@@ -0,0 +1,50 @@
+#include <kernel/syscalls.h>
+#include <kernel/vmm.h>
+#include <kernel/vfs.h>
+#include <errno.h>
+#include <string.h>
+#include <arch/cls.h>
+#include <kernel/sched.h>
+#include <sys/stat.h>
+
+syscallret syscall_chdir(const char* path){
+	syscallret retv;
+
+	retv.ret = -1;
+
+	if(path > USER_SPACE_END){
+		retv.errno = EFAULT;
+		return retv;
+	}
+
+	size_t len = strlen(path);
+	char buff[len+1];
+
+	strcpy(buff, path);
+
+	proc_t* proc = arch_getcls()->thread->proc;
+
+	vnode_t* node;
+
+	retv.errno = vfs_open(&node, buff[0] == '/' ? proc->root : proc->cwd, buff);
+
+	if(retv.errno)
+		return retv;
+
+	if(GETTYPE(node->st.st_mode) != TYPE_DIR){
+		vfs_close(node);
+		retv.errno = ENOTDIR;
+		return retv;
+	}
+	
+	vnode_t* old = proc->cwd;
+	proc->cwd = node;
+
+	vfs_close(old);
+	
+	retv.ret = 0;
+
+	return retv;
+
+
+}