From 1a10a3725e7bea67e558715f6e9f78abcb415b3a Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Wed, 30 Apr 2025 21:07:46 -0400
Subject: finish syscall impls

---
 user/lib/entry.S   |  5 ++---
 user/lib/fclose.c  | 10 ++++++++++
 user/lib/fseek.c   | 16 ++++++++++++++++
 user/lib/syscall.S |  3 +++
 4 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 user/lib/fclose.c
 create mode 100644 user/lib/fseek.c

(limited to 'user/lib')

diff --git a/user/lib/entry.S b/user/lib/entry.S
index 40570b5..efaa652 100644
--- a/user/lib/entry.S
+++ b/user/lib/entry.S
@@ -5,7 +5,6 @@
 	.section .text
 	.code64
 _start:
-	call main
-	subq	$16, %rsp # ???
-	pushq	%rax
+	call	main
+	movq	%rax, %rdi
 	call	exit
diff --git a/user/lib/fclose.c b/user/lib/fclose.c
new file mode 100644
index 0000000..be31421
--- /dev/null
+++ b/user/lib/fclose.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <unistd.h>
+
+void fclose(FILE *stream)
+{
+	int fd;
+
+	fd = (uintptr_t)stream;
+	close(fd);
+}
diff --git a/user/lib/fseek.c b/user/lib/fseek.c
new file mode 100644
index 0000000..a7a3377
--- /dev/null
+++ b/user/lib/fseek.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int fseek(FILE *stream, long off, int whence)
+{
+	int fd;
+	fd = (uintptr_t)stream;
+	return seek(fd, off, whence);
+}
+
+long ftell(FILE *stream)
+{
+	int fd;
+	fd = (uintptr_t)stream;
+	return seek(fd, 0, SEEK_CUR);
+}
diff --git a/user/lib/syscall.S b/user/lib/syscall.S
index 2ba4dc0..9f7025e 100644
--- a/user/lib/syscall.S
+++ b/user/lib/syscall.S
@@ -13,6 +13,8 @@ SYSCALL exit SYS_exit
 SYSCALL waitpid SYS_waitpid
 SYSCALL fork SYS_fork
 SYSCALL exec SYS_exec
+SYSCALL open SYS_open
+SYSCALL close SYS_close
 SYSCALL read SYS_read
 SYSCALL write SYS_write
 SYSCALL getpid SYS_getpid
@@ -27,3 +29,4 @@ SYSCALL sbrk SYS_sbrk
 SYSCALL poweroff SYS_poweroff
 SYSCALL drm SYS_drm
 SYSCALL ticks SYS_ticks
+SYSCALL seek SYS_seek
-- 
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