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Use posix_fallocate instead of ftruncate.

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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
This commit is contained in:
Rafael Espindola 2016-07-19 20:19:56 +00:00
parent a8e27e16eb
commit 2037c03682
3 changed files with 12 additions and 0 deletions
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1
cmake/config-ix.cmake
View File

@ -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)

2
include/llvm/Config/config.h.cmake
View File

@ -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

9
lib/Support/Unix/Path.inc
View File

@ -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();
}