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Properly handling SPDLOG_PREVENT_CHILD_FD

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Removed check for posix version so that missing O_CLOEXEC leads to
compiler error.

Removed extra function since it hat no real purpose anymore.

Error behavior between Windows and Unix now equivalent.
This commit is contained in:
dominic 2020-02-08 12:15:05 +01:00
parent a9c3630d1b
commit 033fe9f133
2 changed files with 12 additions and 31 deletions
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39
include/spdlog/details/os-inl.h
View File

@ -126,23 +126,6 @@ SPDLOG_INLINE std::tm gmtime() SPDLOG_NOEXCEPT
return gmtime(now_t);
}
#ifdef SPDLOG_PREVENT_CHILD_FD
SPDLOG_INLINE void prevent_child_fd(FILE *f)
{
#ifdef _WIN32
auto file_handle = reinterpret_cast<HANDLE>(_get_osfhandle(::_fileno(f)));
if (!::SetHandleInformation(file_handle, HANDLE_FLAG_INHERIT, 0))
SPDLOG_THROW(spdlog_ex("SetHandleInformation failed", errno));
#else
auto fd = ::fileno(f);
if (::fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
{
SPDLOG_THROW(spdlog_ex("fcntl with FD_CLOEXEC failed", errno));
}
#endif
}
#endif // SPDLOG_PREVENT_CHILD_FD
// fopen_s on non windows for writing
SPDLOG_INLINE bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode)
{
@ -152,10 +135,19 @@ SPDLOG_INLINE bool fopen_s(FILE **fp, const filename_t &filename, const filename
#else
*fp = ::_fsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
#endif
#if defined(SPDLOG_PREVENT_CHILD_FD)
if (*fp != nullptr)
{
auto file_handle = reinterpret_cast<HANDLE>(_get_osfhandle(::_fileno(*fp)));
if (!::SetHandleInformation(file_handle, HANDLE_FLAG_INHERIT, 0))
{
:fclose(*fp);
*fp = nullptr;
}
}
#endif
#else // unix
#if defined(SPDLOG_PREVENT_CHILD_FD) && (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L)
// prevent child processes from inheriting log file descriptors direcly on open
// so there is no race with a possible fork and exec
#if defined(SPDLOG_PREVENT_CHILD_FD)
const int mode_flag = mode == SPDLOG_FILENAME_T("ab") ? O_APPEND : O_TRUNC;
const int fd = ::open((filename.c_str()), O_CREAT | O_WRONLY | O_CLOEXEC | mode_flag, mode_t(0644));
if(fd == -1)
@ -172,13 +164,6 @@ SPDLOG_INLINE bool fopen_s(FILE **fp, const filename_t &filename, const filename
#endif
#endif
#if defined(SPDLOG_PREVENT_CHILD_FD) && !(defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L)
// prevent child processes from inheriting log file descriptors
if (*fp != nullptr)
{
prevent_child_fd(*fp);
}
#endif
return *fp == nullptr;
}

4
include/spdlog/details/os.h
View File

@ -38,10 +38,6 @@ static const char folder_sep = '\\';
SPDLOG_CONSTEXPR static const char folder_sep = '/';
#endif
#ifdef SPDLOG_PREVENT_CHILD_FD
void prevent_child_fd(FILE *f);
#endif
// fopen_s on non windows for writing
bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode);