From b48327d357e0818d1a6ae2a064cfa7d1567e1242 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Sun, 5 Dec 2021 15:17:44 -0800
Subject: feat(huge): huge refactor (in progress).

Commented out libc includes to uncover all explicit dependencies.
A large fraction has now been ported over (no testing).
I did not port over the command line tools, such as the rc shell.
These will be done independently - as of now I just want the library to
stand independent.

Compilation currently fails due to the lack of math functions.
---
 sys/linux/amd64/arch/constants.h | 2 --
 sys/linux/port/os/constants.h    | 7 +++++++
 sys/linux/src/access.c           | 7 +++++++
 sys/linux/src/accessat.c         | 8 ++++++++
 sys/linux/src/cwd.c              | 8 ++++++++
 sys/linux/src/openat.c           | 8 ++++++++
 sys/linux/src/read.c             | 2 +-
 sys/linux/src/write.c            | 2 +-
 8 files changed, 40 insertions(+), 4 deletions(-)
 create mode 100644 sys/linux/src/access.c
 create mode 100644 sys/linux/src/accessat.c
 create mode 100644 sys/linux/src/cwd.c
 create mode 100644 sys/linux/src/openat.c

(limited to 'sys/linux')

diff --git a/sys/linux/amd64/arch/constants.h b/sys/linux/amd64/arch/constants.h
index 1949bdf..f1c1b4c 100644
--- a/sys/linux/amd64/arch/constants.h
+++ b/sys/linux/amd64/arch/constants.h
@@ -19,5 +19,3 @@
 #define  sys·ONoATime    01000000
 #define  sys·OPath       010000000
 #define  sys·OTempFile   020200000
-
-#define SYS·HAVE_FCNTL
diff --git a/sys/linux/port/os/constants.h b/sys/linux/port/os/constants.h
index f994a93..03bab2a 100644
--- a/sys/linux/port/os/constants.h
+++ b/sys/linux/port/os/constants.h
@@ -1,5 +1,12 @@
 #pragma once
 
+/* file access */
+#define sys·FileExists   0
+#define sys·FileCanExec  1
+#define sys·FileCanWrite 2
+#define sys·FileCanRead  4
+
+
 /* device modes */
 #define sys·ModeFile   0170000
 #define sys·ModeDir    0040000
diff --git a/sys/linux/src/access.c b/sys/linux/src/access.c
new file mode 100644
index 0000000..fc83b55
--- /dev/null
+++ b/sys/linux/src/access.c
@@ -0,0 +1,7 @@
+#include "internal.h"
+
+int
+sys·access(char *path, int mode)
+{
+    return sys·accessat(sys·FdCwd, path, mode, 0);
+}
diff --git a/sys/linux/src/accessat.c b/sys/linux/src/accessat.c
new file mode 100644
index 0000000..ba1362f
--- /dev/null
+++ b/sys/linux/src/accessat.c
@@ -0,0 +1,8 @@
+#include "internal.h"
+
+int
+sys·accessat(int dirfd, char *path, int mode, int flags)
+{
+    long ret = syscall(·FAccessAt2, path, mode, flags);
+    return error(ret);
+}
diff --git a/sys/linux/src/cwd.c b/sys/linux/src/cwd.c
new file mode 100644
index 0000000..0d8f3c3
--- /dev/null
+++ b/sys/linux/src/cwd.c
@@ -0,0 +1,8 @@
+#include "internal.h"
+
+int
+sys·cwd(char *buf, uintptr size)
+{
+    long ret = syscall(·GetCwd, buf, size);
+    return error(ret);
+}
diff --git a/sys/linux/src/openat.c b/sys/linux/src/openat.c
new file mode 100644
index 0000000..7db7844
--- /dev/null
+++ b/sys/linux/src/openat.c
@@ -0,0 +1,8 @@
+#include "internal.h"
+
+int
+sys·openat(int dirfd, char *path, int flags, int mode, int *fd)
+{
+    long ret = *fd = syscall(·OpenAt, dirfd, path, flags, mode);
+    return error(ret);
+}
diff --git a/sys/linux/src/read.c b/sys/linux/src/read.c
index db9cabf..1ca1a85 100644
--- a/sys/linux/src/read.c
+++ b/sys/linux/src/read.c
@@ -1,7 +1,7 @@
 #include "internal.h"
 
 int
-sys·read(int fd, uintptr len, void *buf, intptr *n)
+sys·read(int fd, void *buf, uintptr len, intptr *n)
 {
     intptr ret = *n = syscall(·Read, fd, buf, len);
     return error(ret);
diff --git a/sys/linux/src/write.c b/sys/linux/src/write.c
index 4e09d82..9586b93 100644
--- a/sys/linux/src/write.c
+++ b/sys/linux/src/write.c
@@ -1,7 +1,7 @@
 #include "internal.h"
 
 int
-sys·write(int fd, uintptr len, void *buf, intptr *ret)
+sys·write(int fd, void *buf, uintptr len, intptr *ret)
 {
     long err = *ret = syscall(·Write, fd, buf, len);
     return error(err);
-- 
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