https://bugs.llvm.org/show_bug.cgi?id=42572
Bug ID: 42572
Summary: std::ofstream silently fails to write files when they
can't be created
Product: libc++
Version: unspecified
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: y...@tsoft.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
The example from cplusplus.com
http://www.cplusplus.com/reference/fstream/ofstream/open/ with the modified
file name fails silently, showing how error-prone the file interface is:
> #include <fstream>
>
> int main () {
> std::ofstream ofs;
> ofs.open ("nonexistent-noexistent/test.txt", std::ofstream::out |
> std::ofstream::app);
>
> ofs << " more lorem ipsum";
>
> ofs.close();
>
> return 0;
> }
No exception is thrown, no error message is printed.
The kernel trace shows that the error "No such file or directory" is lost by
STL:
> 47377 ofstream CALL
> open(0x20229d,0x209<O_WRONLY|O_APPEND|O_CREAT>,0666<S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH>)
> 47377 ofstream NAMI "nonexistent-noexistent/test.txt"
> 47377 ofstream RET open -1 errno 2 No such file or directory
FreeBSD 12 amd64, clang8.
Yuri
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