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#pragma once
#include <cerrno>
#include <system_error>
// `errno` is only meaningful when it fails. E.g., a successful `fork()` sets
// `errno` to `EINVAL` in child process on some macos
// (https://stackoverflow.com/a/20295079), and thus `errno` should really only
// be inspected if an error occurred.
//
// All functions used in `libshm` (so far) indicate error by returning `-1`. If
// you want to use a function with a different error reporting mechanism, you
// need to port `SYSCHECK` from `torch/lib/c10d/Utils.hpp`.
#define SYSCHECK_ERR_RETURN_NEG1(expr) \
while (true) { \
if ((expr) == -1) { \
if (errno == EINTR) { \
continue; \
} else { \
throw std::system_error(errno, std::system_category()); \
} \
} else { \
break; \
} \
}
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