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[flang][runtime] OPEN write-only files 

If a file being opened with no ACTION= is write-only then cope with
it rather than defaulting prematurely to treating it as read-only.

Differential Revision: https://reviews.llvm.org/D127015
This commit is contained in:
Peter Klausler 2022-05-29 08:36:57 -07:00
parent cc3bd43533
commit e5a4f730da
1 changed files with 8 additions and 2 deletions
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10
flang/runtime/file.cpp
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@ -97,12 +97,18 @@ void OpenFile::Open(OpenStatus status, std::optional<Action> action,
flags |= O_TRUNC; flags |= O_TRUNC;
} }
if (!action) { if (!action) {
// Try to open read/write, back off to read-only on failure // Try to open read/write, back off to read-only or even write-only
// on failure
fd_ = ::open(path_.get(), flags | O_RDWR, 0600); fd_ = ::open(path_.get(), flags | O_RDWR, 0600);
if (fd_ >= 0) { if (fd_ >= 0) {
action = Action::ReadWrite; action = Action::ReadWrite;
} else { } else {
action = Action::Read; fd_ = ::open(path_.get(), flags | O_RDONLY, 0600);
if (fd_ >= 0) {
action = Action::Read;
} else {
action = Action::Write;
}
} }
} }
if (fd_ < 0) { if (fd_ < 0) {