Use posix_fallocate instead of ftruncate.
This makes sure that space is actually available. With this change running lld on a full file system causes it to exit with failed to open foo: No space left on device instead of crashing with a sigbus. llvm-svn: 276017
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@ -162,6 +162,7 @@ check_symbol_exists(setrlimit sys/resource.h HAVE_SETRLIMIT)
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check_symbol_exists(isatty unistd.h HAVE_ISATTY)
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check_symbol_exists(isatty unistd.h HAVE_ISATTY)
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check_symbol_exists(futimens sys/stat.h HAVE_FUTIMENS)
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check_symbol_exists(futimens sys/stat.h HAVE_FUTIMENS)
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check_symbol_exists(futimes sys/time.h HAVE_FUTIMES)
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check_symbol_exists(futimes sys/time.h HAVE_FUTIMES)
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check_symbol_exists(posix_fallocate fcntl.h HAVE_POSIX_FALLOCATE)
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if( HAVE_SETJMP_H )
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if( HAVE_SETJMP_H )
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check_symbol_exists(longjmp setjmp.h HAVE_LONGJMP)
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check_symbol_exists(longjmp setjmp.h HAVE_LONGJMP)
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check_symbol_exists(setjmp setjmp.h HAVE_SETJMP)
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check_symbol_exists(setjmp setjmp.h HAVE_SETJMP)
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@ -585,4 +585,6 @@
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/* Define to 1 if you have the `_chsize_s' function. */
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/* Define to 1 if you have the `_chsize_s' function. */
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#cmakedefine HAVE__CHSIZE_S ${HAVE__CHSIZE_S}
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#cmakedefine HAVE__CHSIZE_S ${HAVE__CHSIZE_S}
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#cmakedefine HAVE_POSIX_FALLOCATE ${HAVE_POSIX_FALLOCATE}
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#endif
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#endif
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@ -329,8 +329,17 @@ std::error_code rename(const Twine &from, const Twine &to) {
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}
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}
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std::error_code resize_file(int FD, uint64_t Size) {
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std::error_code resize_file(int FD, uint64_t Size) {
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#if defined(HAVE_POSIX_FALLOCATE)
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// If we have posix_fallocate use it. Unlike ftruncate it always allocates
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// space, so we get an error if the disk is full.
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if (int Err = ::posix_fallocate(FD, 0, Size))
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return std::error_code(Err, std::generic_category());
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#else
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// Use ftruncate as a fallback. It may or may not allocate space. At least on
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// OS X with HFS+ it does.
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if (::ftruncate(FD, Size) == -1)
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if (::ftruncate(FD, Size) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code(errno, std::generic_category());
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#endif
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return std::error_code();
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return std::error_code();
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}
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}
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