syscalls: fstat

src/arch/x86_64/syscall.asm

@@ -12,7 +12,8 @@ extern syscall_close
 extern syscall_isatty
 extern syscall_write
 extern syscall_stat
-func_count equ 11
+extern syscall_fstat
+func_count equ 12
 
 
 func_table:
@@ -27,6 +28,7 @@ func_table:
 	dq syscall_isatty
 	dq syscall_write
 	dq syscall_stat
+	dq syscall_fstat
 section .text
 global asm_syscall_entry
 

src/sys/syscalls/fstat.c

@@ -0,0 +1,42 @@
+#include <kernel/syscalls.h>
+#include <sys/stat.h>
+#include <kernel/fd.h>
+#include <arch/cls.h>
+#include <kernel/vfs.h>
+#include <arch/spinlock.h>
+#include <string.h>
+
+syscallret syscall_fstat(int ifd, stat* st){
+	syscallret retv;
+	retv.ret = -1;
+
+	if(st > USER_SPACE_END){
+		retv.errno = EFAULT;
+		return retv;
+	}
+
+	proc_t* proc = arch_getcls()->thread->proc;
+
+        fd_t* fd = proc->fds + ifd;
+
+        spinlock_acquire(&proc->fdlock);
+
+        if(proc->fdcount <= ifd || fd->node == NULL || (fd->flags & FD_FLAGS_READ) == 0){
+                spinlock_release(&proc->fdlock);
+                retv.errno = EBADF;
+                return retv;
+        }
+
+        spinlock_acquire(&fd->lock);
+        spinlock_release(&proc->fdlock);
+	
+	memcpy(st, &fd->node->st, sizeof(stat)); // XXX user memcpy
+	
+	spinlock_release(&fd->lock);
+
+	retv.errno = 0;
+	retv.ret = 0;
+
+	return retv;
+
+}