OpenBSD support. (#1126)

* Advise porter on where to make necessary change.

In #1075 the change was already made for BSD (thank you!); my working
edit had this guidance to ensure future porters get an error directing
them where to make a necessary change.

Otherwise, the FoundationEssentials build will fail and complain these
variables are not defined but not have guidance as to where they are
sourced from.

* OpenBSD does not support extended attributes.

* OpenBSD does not have secure_getenv.

* Remaining OpenBSD changes.

* OpenBSD also needs `pthread_mutex_t?`.

* Originally I followed Darwin's check with `d_namlen`, but this should
  work too.

* Correct statvfs type casts for OpenBSD.

On OpenBSD, fsblkcnt_t -- the type of f_blocks -- is a UInt64; therefore,
so must `blockSize` be.

Ultimately, both sides of the `totalSizeBytes` multiplication should
probably be type cast for all platforms, but that's a more significant
functional change for another time.

* Default activeProcessorCount to 1, not 0.

After a rather tedious debugging session trying to figure out why
swiftpm-bootstrap appeared to be deadlocked, this turned out to be the
culprit. Perhaps this should be #error instead, but for now, set a
sensible default.

* Use sysconf for activeProcessorCount.

This is what Dispatch does in some places for OpenBSD anyway, so do
likewise here.

Author: 3405691582

Sources/FoundationEssentials/Data/Data+Reading.swift

@@ -40,6 +40,8 @@ func _fgetxattr(_ fd: Int32, _ name: UnsafePointer<CChar>!, _ value: UnsafeMutab
     return fgetxattr(fd, name, value, size, position, options)
 #elseif os(FreeBSD)
     return extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size)
+#elseif os(OpenBSD)
+    return -1
 #elseif canImport(Glibc) || canImport(Musl) || canImport(Android)
     return fgetxattr(fd, name, value, size)
 #else

Sources/FoundationEssentials/Data/Data+Writing.swift

@@ -639,6 +639,8 @@ private func writeExtendedAttributes(fd: Int32, attributes: [String : Data]) {
             _ = fsetxattr(fd, key, valueBuf.baseAddress!, valueBuf.count, 0, 0)
 #elseif os(FreeBSD)
             _ = extattr_set_fd(fd, EXTATTR_NAMESPACE_USER, key, valueBuf.baseAddress!, valueBuf.count)
+#elseif os(OpenBSD)
+            return
 #elseif canImport(Glibc) || canImport(Musl)
             _ = fsetxattr(fd, key, valueBuf.baseAddress!, valueBuf.count, 0)
 #endif

Sources/FoundationEssentials/FileManager/FileManager+Directories.swift

@@ -201,7 +201,7 @@ extension _FileManagerImpl {
             }
         }
         return results
-#elseif os(WASI)
+#elseif os(WASI) || os(OpenBSD)
         // wasi-libc does not support FTS for now
         throw CocoaError.errorWithFilePath(.featureUnsupported, path)
 #else

Sources/FoundationEssentials/FileManager/FileManager+Files.swift

@@ -485,7 +485,7 @@ extension _FileManagerImpl {
 #endif
     }
 
-#if !os(Windows) && !os(WASI)
+#if !os(Windows) && !os(WASI) && !os(OpenBSD)
     private func _extendedAttribute(_ key: UnsafePointer<CChar>, at path: UnsafePointer<CChar>, followSymlinks: Bool) throws -> Data? {
         #if canImport(Darwin)
         var size = getxattr(path, key, nil, 0, 0, followSymlinks ? 0 : XATTR_NOFOLLOW)
@@ -647,7 +647,7 @@ extension _FileManagerImpl {
 
             var attributes = statAtPath.fileAttributes
             try? Self._catInfo(for: URL(filePath: path, directoryHint: .isDirectory), statInfo: statAtPath, into: &attributes)
-            #if !os(WASI) // WASI does not support extended attributes
+            #if !os(WASI) && !os(OpenBSD)
             if let extendedAttrs = try? _extendedAttributes(at: fsRep, followSymlinks: false) {
                 attributes[._extendedAttributes] = extendedAttrs
             }
@@ -736,6 +736,9 @@ extension _FileManagerImpl {
             #if canImport(Darwin)
             let fsNumber = result.f_fsid.val.0
             let blockSize = UInt64(result.f_bsize)
+            #elseif os(OpenBSD)
+            let fsNumber = result.f_fsid
+            let blockSize = UInt64(result.f_bsize)
             #else
             let fsNumber = result.f_fsid
             let blockSize = UInt(result.f_frsize)
@@ -950,7 +953,7 @@ extension _FileManagerImpl {
             try Self._setCatInfoAttributes(attributes, path: path)
 
             if let extendedAttrs = attributes[.init("NSFileExtendedAttributes")] as? [String : Data] {
-                #if os(WASI)
+                #if os(WASI) || os(OpenBSD)
                 // WASI does not support extended attributes
                 throw CocoaError.errorWithFilePath(.featureUnsupported, path)
                 #elseif canImport(Android)

Sources/FoundationEssentials/FileManager/FileManager+Utilities.swift

@@ -178,7 +178,7 @@ extension _FileManagerImpl {
         #endif
     }
 
-#if !os(Windows) && !os(WASI)
+#if !os(Windows) && !os(WASI) && !os(OpenBSD)
     static func _setAttribute(_ key: UnsafePointer<CChar>, value: Data, at path: UnsafePointer<CChar>, followSymLinks: Bool) throws {
         try value.withUnsafeBytes { buffer in
             #if canImport(Darwin)

Sources/FoundationEssentials/FileManager/FileOperations+Enumeration.swift

@@ -354,7 +354,8 @@ struct _POSIXDirectoryContentsSequence: Sequence {
                     continue
                 }
                 #endif
-                #if os(FreeBSD)
+
+                #if os(FreeBSD) || os(OpenBSD)
                 guard dent.pointee.d_fileno != 0 else {
                     continue
                 }
@@ -363,6 +364,7 @@ struct _POSIXDirectoryContentsSequence: Sequence {
                     continue
                 }
                 #endif
+
                 // Use name
                 let fileName: String
                 #if os(WASI)

Sources/FoundationEssentials/FileManager/FileOperations.swift

@@ -921,7 +921,7 @@ enum _FileOperations {
         }
         var current: off_t = 0
 
-        #if os(WASI)
+        #if os(WASI) || os(OpenBSD)
         // 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 {
@@ -958,7 +958,7 @@ enum _FileOperations {
 
     #if !canImport(Darwin)
     private static func _copyDirectoryMetadata(srcFD: CInt, srcPath: @autoclosure () -> String, dstFD: CInt, dstPath: @autoclosure () -> String, delegate: some LinkOrCopyDelegate) throws {
-        #if !os(WASI) && !os(Android)
+        #if !os(WASI) && !os(Android) && !os(OpenBSD)
         // Copy extended attributes
         #if os(FreeBSD)
         // FreeBSD uses the `extattr_*` calls for setting extended attributes. Unlike like, the namespace for the extattrs are not determined by prefix of the attribute

Sources/FoundationEssentials/LockedState.swift

@@ -31,7 +31,7 @@ package struct LockedState<State> {
     private struct _Lock {
 #if canImport(os)
         typealias Primitive = os_unfair_lock
-#elseif os(FreeBSD)
+#elseif os(FreeBSD) || os(OpenBSD)
         typealias Primitive = pthread_mutex_t?
 #elseif canImport(Bionic) || canImport(Glibc) || canImport(Musl)
         typealias Primitive = pthread_mutex_t

Sources/FoundationEssentials/Platform.swift

@@ -224,7 +224,7 @@ extension Platform {
 // MARK: - Environment Variables
 extension Platform {
     static func getEnvSecure(_ name: String) -> String? {
-        #if canImport(Glibc)
+        #if canImport(Glibc) && !os(OpenBSD)
         if let value = secure_getenv(name) {
             return String(cString: value)
         } else {

Sources/FoundationEssentials/ProcessInfo/ProcessInfo.swift

@@ -469,7 +469,7 @@ extension _ProcessInfo {
             return 0
         }
         return Int(count)
-#elseif os(Linux) || os(FreeBSD) || canImport(Android)
+#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || canImport(Android)
         #if os(Linux)
         if let fsCount = Self.fsCoreCount() {
             return fsCount
@@ -481,7 +481,7 @@ extension _ProcessInfo {
         GetSystemInfo(&sysInfo)
         return sysInfo.dwActiveProcessorMask.nonzeroBitCount
 #else
-        return 0
+        return 1
 #endif
     }