check_symbol_exists(isatty unistd.h HAVE_ISATTY)
check_symbol_exists(futimens sys/stat.h HAVE_FUTIMENS)
check_symbol_exists(futimes sys/time.h HAVE_FUTIMES)
+check_symbol_exists(posix_fallocate fcntl.h HAVE_POSIX_FALLOCATE)
if( HAVE_SETJMP_H )
check_symbol_exists(longjmp setjmp.h HAVE_LONGJMP)
check_symbol_exists(setjmp setjmp.h HAVE_SETJMP)
}
std::error_code resize_file(int FD, uint64_t Size) {
+#if defined(HAVE_POSIX_FALLOCATE)
+ // If we have posix_fallocate use it. Unlike ftruncate it always allocates
+ // space, so we get an error if the disk is full.
+ if (int Err = ::posix_fallocate(FD, 0, Size))
+ return std::error_code(Err, std::generic_category());
+#else
+ // Use ftruncate as a fallback. It may or may not allocate space. At least on
+ // OS X with HFS+ it does.
if (::ftruncate(FD, Size) == -1)
return std::error_code(errno, std::generic_category());
+#endif
return std::error_code();
}