liblinux++

commit e3c35dc7aa1a22f744d4aaaaea08f2365d9b0d36
parent 09504ff0b7b080108faeda3c94982aaa429b6885
Author: Henry Wilson <henry@henryandlizzy.uk>
Date:   Mon, 29 Dec 2025 15:50:19 +0000

Add unlinkat

Diffstat:
M
aarch64.s
 | 
6
++++++
M
linux.hpp
 | 
7
+++++++
A
unlink.cpp
 | 
7
+++++++
M
x86_64.s
 | 
6
++++++

4 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/aarch64.s b/aarch64.s
@@ -1,3 +1,5 @@
+# Syscall numbers https://www.chromium.org/chromium-os/developer-library/reference/linux-constants/syscalls/#arm64-64-bit
+
 .global start
 
 .text
@@ -28,6 +30,10 @@ extern_alias \name
 .text
 .global exit
 
+extern unlinkat
+extern_alias _Z8unlinkat4file5c_str12unlink_flags
+syscall 35
+
 extern getdents64
 extern_alias _Z10getdents644fileP14linux_dirent64m
 syscall 61
diff --git a/linux.hpp b/linux.hpp
@@ -189,3 +189,10 @@ enum class rename_flags : unsigned int
 };
 
 extern syscall_result<void> renameat2(file olddir, c_str oldpath, file newdir, c_str newpath, rename_flags flags) noexcept;
+
+enum class unlink_flags : int
+{
+	REMOVEDIR = 0x200,
+};
+
+extern syscall_result<void> unlinkat(file dir, c_str path, unlink_flags flags);
diff --git a/unlink.cpp b/unlink.cpp
@@ -0,0 +1,7 @@
+#include "linux.hpp"
+
+int main(int argc, char* argv[])
+{
+  for (int i = 1; i < argc; ++i)
+    *unlinkat(AT_FDCWD, argv[i], {});
+}
diff --git a/x86_64.s b/x86_64.s
@@ -1,3 +1,5 @@
+# Syscall numbers https://www.chromium.org/chromium-os/developer-library/reference/linux-constants/syscalls/#x86_64-64-bit
+
 .intel_syntax noprefix
 
 .global start
@@ -86,6 +88,10 @@ extern openat
 extern_alias _Z6openat4file5c_strii
 _syscall	257	syscall6
 
+extern unlinkat
+extern_alias _Z8unlinkat4file5c_str12unlink_flags
+_syscall	263	syscall3
+
 extern renameat
 extern_alias _Z9renameat24file5c_strS_S0_12rename_flags
 _syscall	316	syscall6