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If errno is zero strerror_r does not modify the buffer, leaving it unterminated.
This causes garbage to be printed out after error messages. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20165 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -51,6 +51,7 @@ void MappedFile::initialize() {
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else if (options_&WRITE_ACCESS)
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mode = O_WRONLY;
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info_->fd_ = ::open(path_.c_str(),mode);
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if (info_->fd_ < 0) {
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delete info_;
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info_ = 0;
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@ -68,14 +68,17 @@
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inline void ThrowErrno(const std::string& prefix) {
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char buffer[MAXPATHLEN];
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buffer[0] = 0;
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#ifdef HAVE_STRERROR_R
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// strerror_r is thread-safe.
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strerror_r(errno,buffer,MAXPATHLEN-1);
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if (errno)
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strerror_r(errno,buffer,MAXPATHLEN-1);
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#elif HAVE_STRERROR
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// Copy the thread un-safe result of strerror into
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// the buffer as fast as possible to minimize impact
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// of collision of strerror in multiple threads.
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strncpy(buffer,strerror(errno),MAXPATHLEN-1);
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if (Errno)
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strncpy(buffer,strerror(errno),MAXPATHLEN-1);
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buffer[MAXPATHLEN-1] = 0;
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#else
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// Strange that this system doesn't even have strerror
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