syscalls: getdirent

src/arch/x86_64/syscall.asm

@@ -21,7 +21,8 @@ extern syscall_dup
 extern syscall_dup2
 extern syscall_fcntl
 extern syscall_getpid
-func_count equ 20
+extern syscall_getdirent
+func_count equ 21
 
 
 func_table:
@@ -45,6 +46,7 @@ func_table:
 	dq syscall_dup2
 	dq syscall_fcntl
 	dq syscall_getpid
+	dq syscall_getdirent
 section .text
 global asm_syscall_entry
 

src/sys/syscalls/getdirent.c

@@ -0,0 +1,51 @@
+#include <kernel/syscalls.h>
+#include <dirent.h>
+#include <arch/cls.h>
+#include <sys/stat.h>
+#include <kernel/vmm.h>
+
+syscallret syscall_getdirent(int ifd, void* buff, size_t max_size){
+	syscallret retv;
+	retv.ret = -1;
+	
+	if(buff > USER_SPACE_END){
+		retv.errno = EFAULT;
+		return retv;
+	}
+
+	size_t readc = max_size / sizeof(dent_t);
+
+	if(readc == 0){
+		retv.errno = EINVAL;
+		return retv;
+	}
+
+	fd_t* fd;
+
+	retv.errno = fd_access(&arch_getcls()->thread->proc->fdtable, &fd, ifd);
+	
+	if(retv.errno)
+		return retv;
+
+	if(GETTYPE(fd->node->st.st_mode) != TYPE_DIR){
+		retv.errno = ENOTDIR;
+		fd_release(fd);
+		return retv;
+	}
+
+	dent_t kbuff[readc];
+
+	retv.errno = vfs_getdirent(fd->node, kbuff, readc, fd->offset, &retv.ret);
+
+
+	fd->offset += retv.ret;
+	
+	retv.ret *= sizeof(dent_t);
+
+	memcpy(buff, kbuff, retv.ret); // XXX use user memcpy
+
+	fd_release(fd);
+
+	return retv;
+
+}