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Implement _copyRegularFile for WASI without sendfile #787

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Aug 1, 2024
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Implement _copyRegularFile for WASI without sendfile #787

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19 changes: 19 additions & 0 deletions Sources/FoundationEssentials/FileManager/FileOperations.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -871,12 +871,31 @@ enum _FileOperations {
let chunkSize: Int = Int(fileInfo.st_blksize)
var current: off_t = 0

#if os(WASI)
// WASI doesn't have sendfile, so we need to do it in user space with read/write
try withUnsafeTemporaryAllocation(of: UInt8.self, capacity: chunkSize) { buffer in
while current < total {
let readSize = Swift.min(total - Int(current), chunkSize)
let bytesRead = read(srcfd, buffer.baseAddress, readSize)
guard bytesRead >= 0 else {
try delegate.throwIfNecessary(errno, String(cString: srcPtr), String(cString: dstPtr))
return
}
guard write(dstfd, buffer.baseAddress, bytesRead) == bytesRead else {
try delegate.throwIfNecessary(errno, String(cString: srcPtr), String(cString: dstPtr))
return
}
current += off_t(bytesRead)
}
}
#else
while current < total {
guard sendfile(dstfd, srcfd, &current, Swift.min(total - Int(current), chunkSize)) != -1 else {
try delegate.throwIfNecessary(errno, String(cString: srcPtr), String(cString: dstPtr))
return
}
}
#endif
}
#endif

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