From a63134a4a56e8683aeee292b641b4e943cbfb999 Mon Sep 17 00:00:00 2001
From: jim price <shadeops@gmail.com>
Date: Sat, 4 Mar 2023 18:03:37 -0800
Subject: [PATCH] std.os: Add DeviceBusy as a possible write error

In Linux when writing to various files in the virtual file system,
for example /sys/fs/cgroup, if you write an invalid value to a file
you'll get errno 16.

This change allows for these specific cases to be caught instead of
being lumped together in UnexpectedError.
---
 lib/std/os.zig | 5 +++++
 src/link.zig   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/lib/std/os.zig b/lib/std/os.zig
index fe664302a7..3a3433d819 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -1036,6 +1036,7 @@ pub const WriteError = error{
     FileTooBig,
     InputOutput,
     NoSpaceLeft,
+    DeviceBusy,
 
     /// In WASI, this error may occur when the file descriptor does
     /// not hold the required rights to write to it.
@@ -1134,6 +1135,7 @@ pub fn write(fd: fd_t, bytes: []const u8) WriteError!usize {
             .PERM => return error.AccessDenied,
             .PIPE => return error.BrokenPipe,
             .CONNRESET => return error.ConnectionResetByPeer,
+            .BUSY => return error.DeviceBusy,
             else => |err| return unexpectedErrno(err),
         }
     }
@@ -1203,6 +1205,7 @@ pub fn writev(fd: fd_t, iov: []const iovec_const) WriteError!usize {
             .PERM => return error.AccessDenied,
             .PIPE => return error.BrokenPipe,
             .CONNRESET => return error.ConnectionResetByPeer,
+            .BUSY => return error.DeviceBusy,
             else => |err| return unexpectedErrno(err),
         }
     }
@@ -1299,6 +1302,7 @@ pub fn pwrite(fd: fd_t, bytes: []const u8, offset: u64) PWriteError!usize {
             .NXIO => return error.Unseekable,
             .SPIPE => return error.Unseekable,
             .OVERFLOW => return error.Unseekable,
+            .BUSY => return error.DeviceBusy,
             else => |err| return unexpectedErrno(err),
         }
     }
@@ -1388,6 +1392,7 @@ pub fn pwritev(fd: fd_t, iov: []const iovec_const, offset: u64) PWriteError!usiz
             .NXIO => return error.Unseekable,
             .SPIPE => return error.Unseekable,
             .OVERFLOW => return error.Unseekable,
+            .BUSY => return error.DeviceBusy,
             else => |err| return unexpectedErrno(err),
         }
     }
diff --git a/src/link.zig b/src/link.zig
index 4c4915441d..24cc0a3861 100644
--- a/src/link.zig
+++ b/src/link.zig
@@ -460,6 +460,7 @@ pub const File = struct {
         CurrentWorkingDirectoryUnlinked,
         LockViolation,
         NetNameDeleted,
+        DeviceBusy,
     };
 
     /// Called from within the CodeGen to lower a local variable instantion as an unnamed