From cf41cf872e746fca2a2d1e009fbd3ed91f266cda Mon Sep 17 00:00:00 2001
From: Trung Nguyen <57174311+trungnt2910@users.noreply.github.com>
Date: Tue, 5 Mar 2024 14:30:56 +0000
Subject: [PATCH] fix(monika): Fix Haiku read[v]/write[v] syscalls

On non-seekable devices, the position argument is simply ignored and
does not trigger an error.

We emulate this behavior by detecting `EISPIPE` then forwarding the call
to the appropraite non-seeking functions.
---
 monika/linux/io.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/monika/linux/io.cpp b/monika/linux/io.cpp
index e2a4363..11abc26 100644
--- a/monika/linux/io.cpp
+++ b/monika/linux/io.cpp
@@ -137,6 +137,12 @@ ssize_t _moni_write(int fd, haiku_off_t pos, const void* buffer, size_t bufferSi
     else
     {
         bytesWritten = LINUX_SYSCALL4(__NR_pwrite64, fd, buffer, bufferSize, pos);
+        if (bytesWritten == -ESPIPE)
+        {
+            // On Haiku, write_pos ignores the `pos` parameter for non-seekable devices
+            // instead of returning an error.
+            bytesWritten = LINUX_SYSCALL3(__NR_write, fd, buffer, bufferSize);
+        }
     }
 
     if (bytesWritten < 0)
@@ -175,6 +181,10 @@ ssize_t _moni_writev(int fd, haiku_off_t pos, const struct haiku_iovec *vecs, si
     {
         // Last two params: Low and high order bytes of pos.
         bytesWritten = LINUX_SYSCALL5(__NR_pwritev, fd, linuxVecs, count, (uint32_t)pos, ((uint64_t)pos) >> 32);
+        if (bytesWritten == -ESPIPE)
+        {
+            bytesWritten = LINUX_SYSCALL3(__NR_writev, fd, linuxVecs, count);
+        }
     }
 
     LINUX_SYSCALL2(__NR_munmap, linuxVecs, memSize);
@@ -198,6 +208,10 @@ ssize_t _moni_read(int fd, haiku_off_t pos, void* buffer, size_t bufferSize)
     else
     {
         bytesRead = LINUX_SYSCALL4(__NR_pread64, fd, buffer, bufferSize, pos);
+        if (bytesRead == -ESPIPE)
+        {
+            bytesRead = LINUX_SYSCALL3(__NR_read, fd, buffer, bufferSize);
+        }
     }
 
     if (bytesRead < 0)
@@ -236,6 +250,10 @@ ssize_t _moni_readv(int fd, off_t pos, const struct haiku_iovec *vecs, size_t co
     {
         // Last two params: Low and high order bytes of pos.
         bytesRead = LINUX_SYSCALL5(__NR_preadv, fd, linuxVecs, count, (uint32_t)pos, ((uint64_t)pos) >> 32);
+        if (bytesRead == -ESPIPE)
+        {
+            bytesRead = LINUX_SYSCALL3(__NR_readv, fd, linuxVecs, count);
+        }
     }
 
     LINUX_SYSCALL2(__NR_munmap, linuxVecs, memSize);