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author | Jeffrey Yasskin <jyasskin@google.com> | 2009-07-01 18:11:20 +0000 |
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committer | Jeffrey Yasskin <jyasskin@google.com> | 2009-07-01 18:11:20 +0000 |
commit | ed1c0ffe0b2287deaee7cba7506c93aa34c6d4b7 (patch) | |
tree | aacc869a6945fbd60630f775bd2530fa3d2eaed9 /lib/System/Errno.cpp | |
parent | b1d7a5d1146c30a54002b7ab49daf024e3174b95 (diff) | |
download | llvm-ed1c0ffe0b2287deaee7cba7506c93aa34c6d4b7.tar.gz llvm-ed1c0ffe0b2287deaee7cba7506c93aa34c6d4b7.tar.bz2 llvm-ed1c0ffe0b2287deaee7cba7506c93aa34c6d4b7.tar.xz |
Add a portable strerror*() wrapper, llvm::sys::StrError(). This includes the
Windows variant, strerror_s, but I couldn't test that.
I'll update configure and config.h.in in a subsequent patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74621 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/System/Errno.cpp')
-rw-r--r-- | lib/System/Errno.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/System/Errno.cpp b/lib/System/Errno.cpp new file mode 100644 index 0000000000..f4e3a88d05 --- /dev/null +++ b/lib/System/Errno.cpp @@ -0,0 +1,71 @@ +//===- Errno.cpp - errno support --------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the errno wrappers. +// +//===----------------------------------------------------------------------===// + +#include "llvm/System/Errno.h" +#include "llvm/Config/config.h" // Get autoconf configuration settings + +#if HAVE_STRING_H +#include <string.h> + +//===----------------------------------------------------------------------===// +//=== WARNING: Implementation here must contain only TRULY operating system +//=== independent code. +//===----------------------------------------------------------------------===// + +namespace llvm { +namespace sys { + +#if HAVE_ERRNO_H +#include <errno.h> +std::string StrError() { + return StrError(errno); +} +#endif // HAVE_ERRNO_H + +std::string StrError(int errnum) { + const int MaxErrStrLen = 2000; + char buffer[MaxErrStrLen]; + buffer[0] = '\0'; + char* str = buffer; +#ifdef HAVE_STRERROR_R + // strerror_r is thread-safe. + if (errnum) +# if defined(__GLIBC__) && defined(_GNU_SOURCE) + // glibc defines its own incompatible version of strerror_r + // which may not use the buffer supplied. + str = strerror_r(errnum,buffer,MaxErrStrLen-1); +# else + strerror_r(errnum,buffer,MaxErrStrLen-1); +# endif +#elif HAVE_STRERROR_S // Windows. + if (errnum) + strerror_s(buffer, errnum); +#elif HAVE_STRERROR + // Copy the thread un-safe result of strerror into + // the buffer as fast as possible to minimize impact + // of collision of strerror in multiple threads. + if (errnum) + strncpy(buffer,strerror(errnum),MaxErrStrLen-1); + buffer[MaxErrStrLen-1] = '\0'; +#else + // Strange that this system doesn't even have strerror + // but, oh well, just use a generic message + sprintf(buffer, "Error #%d", errnum); +#endif + return str; +} + +} // namespace sys +} // namespace llvm + +#endif // HAVE_STRING_H |