AC_CHECK_FUNCS([powf fmodf strtof round ])
AC_CHECK_FUNCS([getpagesize getrusage getrlimit setrlimit gettimeofday ])
AC_CHECK_FUNCS([isatty mkdtemp mkstemp ])
-AC_CHECK_FUNCS([mktemp posix_spawn realpath sbrk setrlimit strdup ])
+AC_CHECK_FUNCS([mktemp posix_spawn pread realpath sbrk setrlimit strdup ])
AC_CHECK_FUNCS([strerror strerror_r setenv ])
AC_CHECK_FUNCS([strtoll strtoq sysconf malloc_zone_statistics ])
AC_CHECK_FUNCS([setjmp longjmp sigsetjmp siglongjmp writev])
check_symbol_exists(getcwd unistd.h HAVE_GETCWD)
check_symbol_exists(gettimeofday sys/time.h HAVE_GETTIMEOFDAY)
check_symbol_exists(getrlimit "sys/types.h;sys/time.h;sys/resource.h" HAVE_GETRLIMIT)
+check_symbol_exists(posix_spawn spawn.h HAVE_POSIX_SPAWN)
+check_symbol_exists(pread unistd.h HAVE_PREAD)
check_symbol_exists(rindex strings.h HAVE_RINDEX)
check_symbol_exists(strchr string.h HAVE_STRCHR)
check_symbol_exists(strcmp string.h HAVE_STRCMP)
-for ac_func in mktemp posix_spawn realpath sbrk setrlimit strdup
+
+for ac_func in mktemp posix_spawn pread realpath sbrk setrlimit strdup
do
as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
{ echo "$as_me:$LINENO: checking for $ac_func" >&5
/* Define to 1 if you have the `powf' function. */
#cmakedefine HAVE_POWF ${HAVE_POWF}
+/* Define to 1 if you have the `pread' function. */
+#cmakedefine HAVE_PREAD ${HAVE_PREAD}
+
/* Define if libtool can extract symbol lists from object files. */
#undef HAVE_PRELOADED_SYMBOLS
/* Define to 1 if you have the `powf' function. */
#undef HAVE_POWF
+/* Define to 1 if you have the `pread' function. */
+#undef HAVE_PREAD
+
/* Define if libtool can extract symbol lists from object files. */
#undef HAVE_PRELOADED_SYMBOLS
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/Config/config.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/Path.h"
char *BufPtr = const_cast<char*>(SB->getBufferStart());
size_t BytesLeft = MapSize;
+#ifndef HAVE_PREAD
if (lseek(FD, Offset, SEEK_SET) == -1)
return error_code(errno, posix_category());
+#endif
while (BytesLeft) {
+#ifdef HAVE_PREAD
+ ssize_t NumRead = ::pread(FD, BufPtr, BytesLeft, MapSize-BytesLeft+Offset);
+#else
ssize_t NumRead = ::read(FD, BufPtr, BytesLeft);
+#endif
if (NumRead == -1) {
if (errno == EINTR)
continue;