syscalls: chdir

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
 

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;
+
+
+}