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ircd::util: Add uninterruptible_syscall() for use with some POSIX syscalls.
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1 changed files with 34 additions and 5 deletions
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@ -820,19 +820,48 @@ struct values
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};
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};
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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//
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template<long ERROR_CODE = -1,
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class function,
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class... args>
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auto
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syscall(function&& f,
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args&&... a)
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-> typename std::enable_if<std::is_same<int, decltype(f(a...))>::value, int>::type
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{
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const int ret
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{
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f(std::forward<args>(a)...)
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};
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if(unlikely(ret == ERROR_CODE))
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throw std::system_error(errno, std::system_category());
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return ret;
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}
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//
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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// Error-checking closure for POSIX system calls. Note the usage is
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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//
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//
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template<class function,
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template<long ERROR_CODE = -1,
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class function,
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class... args>
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class... args>
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auto
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auto
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syscall(function&& f,
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uninterruptible_syscall(function&& f,
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args&&... a)
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args&&... a)
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-> typename std::enable_if<std::is_same<int, decltype(f(a...))>::value, int>::type
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{
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{
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const auto ret(f(a...));
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int ret; do
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if(unlikely(long(ret) == -1))
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{
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ret = f(std::forward<args>(a)...);
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}
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while(unlikely(ret == ERROR_CODE && errno == EINTR));
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if(unlikely(ret == ERROR_CODE))
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throw std::system_error(errno, std::system_category());
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throw std::system_error(errno, std::system_category());
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return ret;
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return ret;
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