diff options
| -rwxr-xr-x | llvm/cmake/config-ix.cmake | 1 | ||||
| -rw-r--r-- | llvm/include/llvm/Config/config.h.cmake | 2 | ||||
| -rw-r--r-- | llvm/lib/Support/Unix/Path.inc | 9 |
3 files changed, 12 insertions, 0 deletions
diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake index b363a357c58..25cf23ad4bf 100755 --- a/llvm/cmake/config-ix.cmake +++ b/llvm/cmake/config-ix.cmake @@ -162,6 +162,7 @@ check_symbol_exists(setrlimit sys/resource.h HAVE_SETRLIMIT) 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) diff --git a/llvm/include/llvm/Config/config.h.cmake b/llvm/include/llvm/Config/config.h.cmake index 45b30d9171d..efc3cacd59a 100644 --- a/llvm/include/llvm/Config/config.h.cmake +++ b/llvm/include/llvm/Config/config.h.cmake @@ -585,4 +585,6 @@ /* Define to 1 if you have the `_chsize_s' function. */ #cmakedefine HAVE__CHSIZE_S ${HAVE__CHSIZE_S} +#cmakedefine HAVE_POSIX_FALLOCATE ${HAVE_POSIX_FALLOCATE} + #endif diff --git a/llvm/lib/Support/Unix/Path.inc b/llvm/lib/Support/Unix/Path.inc index 84aafcb70d7..ea439c6b79d 100644 --- a/llvm/lib/Support/Unix/Path.inc +++ b/llvm/lib/Support/Unix/Path.inc @@ -329,8 +329,17 @@ std::error_code rename(const Twine &from, const Twine &to) { } 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(); } |
