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Remember if lseek works in this FD.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234619 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2015-04-10 18:15:51 +00:00
parent 139eb5f512
commit e37b898edb
2 changed files with 6 additions and 1 deletions
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4
include/llvm/Support/raw_ostream.h
View File

@ -333,6 +333,8 @@ class raw_fd_ostream : public raw_ostream {
uint64_t pos;
bool SupportsSeeking;
/// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t Size) override;
@ -370,6 +372,8 @@ public:
/// fsync.
void close();
bool supportsSeeking() { return SupportsSeeking; }
/// Flushes the stream and repositions the underlying file descriptor position
/// to the offset specified from the beginning of the file.
uint64_t seek(uint64_t off);

3
lib/Support/raw_ostream.cpp
View File

@ -525,7 +525,8 @@ raw_fd_ostream::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered)
// Get the starting position.
off_t loc = ::lseek(FD, 0, SEEK_CUR);
if (loc == (off_t)-1)
SupportsSeeking = loc != (off_t)-1;
if (!SupportsSeeking)
pos = 0;
else
pos = static_cast<uint64_t>(loc);