change errno.h to cerrno

The former is deprecated by C++14. It's also functionally the same.

From the standard:

19.4
The header<cerrno>is described in Table 43. Its contents are the same as
the POSIX header<errno.h>,except that errno shall be defined as a macro.
[Note: The intent is to remain in close alignment with the POSIX
standard.] A separate errno value shall be provided for each thread.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/Log.cxx

@@ -21,9 +21,10 @@
 #include "util/Domain.hxx"
 #include "util/Exception.hxx"
 
+#include <cerrno>
+
 #include <stdio.h>
 #include <string.h>
-#include <errno.h>
 
 static constexpr Domain exception_domain("exception");
 

src/db/plugins/simple/SimpleDatabasePlugin.cxx

@@ -49,10 +49,9 @@
 #include "fs/io/GzipOutputStream.hxx"
 #endif
 
+#include <cerrno>
 #include <memory>
 
-#include <errno.h>
-
 static constexpr Domain simple_db_domain("simple_db");
 
 inline SimpleDatabase::SimpleDatabase(const ConfigBlock &block)

src/db/update/InotifySource.cxx

@@ -24,8 +24,9 @@
 #include "system/Error.hxx"
 #include "Log.hxx"
 
+#include <cerrno>
+
 #include <sys/inotify.h>
-#include <errno.h>
 #include <stdint.h>
 #include <limits.h>
 

src/db/update/UpdateIO.cxx

@@ -26,7 +26,7 @@
 #include "fs/AllocatedPath.hxx"
 #include "Log.hxx"
 
-#include <errno.h>
+#include <cerrno>
 
 bool
 GetInfo(Storage &storage, const char *uri_utf8, StorageFileInfo &info) noexcept

src/db/update/Walk.cxx

@@ -39,12 +39,12 @@
 #include "Log.hxx"
 
 #include <cassert>
+#include <cerrno>
 #include <exception>
 #include <memory>
 
 #include <string.h>
 #include <stdlib.h>
-#include <errno.h>
 
 UpdateWalk::UpdateWalk(const UpdateConfig &_config,
 		       EventLoop &_loop, DatabaseListener &_listener,

src/event/MultiSocketMonitor.cxx

@@ -23,7 +23,7 @@
 #include <algorithm>
 
 #ifdef USE_EPOLL
-#include <errno.h>
+#include <cerrno>
 #endif
 
 #ifndef _WIN32

src/fs/FileSystem.cxx

@@ -22,7 +22,8 @@
 #include "Limits.hxx"
 #include "system/Error.hxx"
 
-#include <errno.h>
+#include <cerrno>
+
 #include <fcntl.h>
 
 void

src/fs/io/FileOutputStream.cxx

@@ -158,9 +158,10 @@ FileOutputStream::Cancel() noexcept
 
 #else
 
+#include <cerrno>
+
 #include <fcntl.h>
 #include <unistd.h>
-#include <errno.h>
 
 #ifdef HAVE_O_TMPFILE
 #ifndef O_TMPFILE

src/lib/xiph/FlacIOHandle.cxx

@@ -22,7 +22,8 @@
 #include "util/Compiler.h"
 #include "system/Error.hxx"
 
-#include <errno.h>
+#include <cerrno>
+
 #include <stdio.h>
 
 static size_t

src/net/Resolver.cxx

@@ -44,9 +44,10 @@
 #include <net/if.h>
 #endif
 
+#include <cerrno>
+
 #include <string.h>
 #include <stdio.h>
-#include <errno.h>
 
 static inline bool
 ai_is_passive(const struct addrinfo *ai)

src/net/SocketDescriptor.cxx

@@ -42,7 +42,8 @@
 #include <netinet/tcp.h>
 #endif
 
-#include <errno.h>
+#include <cerrno>
+
 #include <string.h>
 
 int

src/net/SocketError.hxx

@@ -27,7 +27,7 @@
 #include <winsock2.h>
 typedef DWORD socket_error_t;
 #else
-#include <errno.h>
+#include <cerrno>
 typedef int socket_error_t;
 #endif
 

src/output/plugins/FifoOutputPlugin.cxx

@@ -28,8 +28,9 @@
 #include "Log.hxx"
 #include "open.h"
 
+#include <cerrno>
+
 #include <sys/stat.h>
-#include <errno.h>
 #include <unistd.h>
 
 class FifoOutput final : AudioOutput {

src/output/plugins/OssOutputPlugin.cxx

@@ -28,13 +28,13 @@
 #include "Log.hxx"
 
 #include <cassert>
+#include <cerrno>
 #include <iterator>
 #include <stdexcept>
 
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
-#include <errno.h>
 #include <stdlib.h>
 #include <unistd.h>
 

src/output/plugins/SolarisOutputPlugin.cxx

@@ -22,12 +22,13 @@
 #include "system/FileDescriptor.hxx"
 #include "system/Error.hxx"
 
+#include <cerrno>
+
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <fcntl.h>
-#include <errno.h>
 
 #if defined(__sun)
 #include <sys/audio.h>

src/system/Error.hxx

@@ -92,7 +92,8 @@ FormatLastError(const char *fmt, Args&&... args) noexcept
 
 #endif /* _WIN32 */
 
-#include <errno.h>
+#include <cerrno>
+
 #include <string.h>
 
 /**

src/system/FatalError.cxx

@@ -30,7 +30,7 @@
 #ifdef _WIN32
 #include <windows.h>
 #else
-#include <errno.h>
+#include <cerrno>
 #endif
 
 static constexpr Domain fatal_error_domain("fatal_error");

test/WriteFile.cxx

@@ -20,8 +20,9 @@
 #include "fs/io/FileOutputStream.hxx"
 #include "util/PrintException.hxx"
 
+#include <cerrno>
+
 #include <unistd.h>
-#include <errno.h>
 
 #include <string.h>
 #include <stdlib.h>