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ircd::util: Add uninterruptible_syscall() for use with some POSIX syscalls.

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This commit is contained in:
Jason Volk 2017-10-11 17:48:16 -07:00
parent dffe222a78
commit 14e5306713
1 changed files with 34 additions and 5 deletions
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39
include/ircd/util.h
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@ -820,19 +820,48 @@ struct values
};
//
// Error-checking closure for POSIX system calls. Note the usage is
// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
//
template<long ERROR_CODE = -1,
class function,
class... args>
auto
syscall(function&& f,
args&&... a)
-> typename std::enable_if<std::is_same<int, decltype(f(a...))>::value, int>::type
{
const int ret
{
f(std::forward<args>(a)...)
};
if(unlikely(ret == ERROR_CODE))
throw std::system_error(errno, std::system_category());
return ret;
}
//
// Error-checking closure for POSIX system calls. Note the usage is
// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
//
template<class function,
template<long ERROR_CODE = -1,
class function,
class... args>
auto
syscall(function&& f,
args&&... a)
uninterruptible_syscall(function&& f,
args&&... a)
-> typename std::enable_if<std::is_same<int, decltype(f(a...))>::value, int>::type
{
const auto ret(f(a...));
if(unlikely(long(ret) == -1))
int ret; do
{
ret = f(std::forward<args>(a)...);
}
while(unlikely(ret == ERROR_CODE && errno == EINTR));
if(unlikely(ret == ERROR_CODE))
throw std::system_error(errno, std::system_category());
return ret;